{"id":13,"date":"2017-07-07T20:21:07","date_gmt":"2017-07-07T20:21:07","guid":{"rendered":"http:\/\/utsaengineer.wpengine.com\/faculty-page-example\/?page_id=13"},"modified":"2017-11-10T09:38:53","modified_gmt":"2017-11-10T15:38:53","slug":"research","status":"publish","type":"page","link":"https:\/\/ceid.utsa.edu\/xzeng\/research\/","title":{"rendered":"Research"},"content":{"rendered":"<p><span style=\"color: #000080\"><strong> Research Thrusts<\/strong><\/span><\/p>\n<p><span style=\"font-family: book antiqua,palatino,serif\">Computational Biomechanics (Bone &amp;\u00a0Cell Mechanics)<\/span><br \/>\n<span style=\"font-family: book antiqua,palatino,serif\"> Computational Methods (Meshfree &amp;\u00a0Cohesive Zone Methods)<\/span><br \/>\n<span style=\"font-family: book antiqua,palatino,serif\"> Computational Material Failure Analysis<\/span><br \/>\n<span style=\"font-family: book antiqua,palatino,serif\"> Bioinspired Design of Hybrid Nanocomposites<\/span><br \/>\n<span style=\"font-family: book antiqua,palatino,serif\"> Ferroelectric Materials Modeling and Simulation<\/span><br \/>\n<span style=\"font-family: book antiqua,palatino,serif\"> Multiscale Modeling and Simulation<\/span><br \/>\n<span style=\"font-family: book antiqua,palatino,serif\"> Nanomechanics and Microcontinuum Theory<\/span><\/p>\n<p class=\"p1\"><span class=\"s1\" style=\"font-size: 14pt\"><b><span style=\"color: #000080;text-decoration: underline\">Bone Mechanics<\/span><i>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/i><\/b><\/span><\/p>\n<p class=\"p2\"><span class=\"s2\"><b><i>Modeling and Simulation of Osteoporosis in Trabecular Bone<\/i><\/b><\/span><\/p>\n<p class=\"p3\" style=\"text-align: justify\"><span class=\"s2\" style=\"font-family: book antiqua,palatino,serif\">Osteoporosis is a skeletal disease characterized by a decrease in bone strength as a result of a decrease of bone mass and a deterioration of bone microstructure. In this study, the imaging data of a CT scanned human femoral neck trabecular bone is directly converted into a meshless model. A model is developed to analyze osteoporosis process. A fracture criterion and the corresponding post-failure are proposed for trabecular bone. The fracture process is modeled and simulated. The simulations show that the fracture stress is not a monotonically decreasing function in the process of fracture, and the microstructure of trabecular bone has a positive effect in preventing progressive failure.\u00a0<\/span><\/p>\n<p class=\"p4\"><span class=\"s2\">\u00a0<img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-113\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/bone-fractur_med_hr.jpeg\" alt=\"\" width=\"550\" height=\"187\" \/><\/span><\/p>\n<p class=\"p4\" style=\"text-align: center\"><span style=\"font-size: 1rem\"><em><span class=\"s2\"><span style=\"font-size: 10pt\">The 3D meshless model, from left to right: stage 1, stage 2 and stage 3<\/span>\u00a0<\/span><\/em><\/span><\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-114\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/image_med.png\" alt=\"\" width=\"560\" height=\"170\" \/><\/p>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em><span class=\"s2\">Normalized fracture stress in fracture process<\/span><\/em><\/span><\/p>\n<p class=\"p2\"><span class=\"s2\"><b><i>Fracture of\u00a0Extrafibril Matrix in Bone<\/i><\/b><\/span><\/p>\n<p class=\"p3\" style=\"text-align: justify\"><span class=\"s2\" style=\"font-family: book antiqua,palatino,serif\">Bone poses various levels of hierarchical structural organization from macroscale to nanoscale.The mechanism of bone failure has been extensively studied, however, the underlying mechanism of plastic deformation in bone is still a debating issue. The possible pathways for plastic flow in bone are most likely due to the sliding between mineral cyrstals, between mineral and collagen phases, or between the mineralized collagen fibrils. At ultrascale level, the extrafibrillar matrix in bone consists of hydroxyapatite (HA) polycrystals bounded through an organic interface (grain boundary).<\/span><\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-115\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/application-2_med.png\" alt=\"\" width=\"560\" height=\"190\" srcset=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/application-2_med.png 510w, https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/application-2_med-300x102.png 300w, https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/application-2_med-160x54.png 160w\" sizes=\"(max-width: 560px) 100vw, 560px\" \/><\/p>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em><span class=\"s2\">Schematic representation of ultrastructure of extrafibrillar matrix in bone<\/span><\/em><\/span><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-1\" width=\"525\" height=\"295\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/bone.mp4?_=1\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/bone.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/bone.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>Deformation process of extrafibrillar matrix under compression<\/em><\/span><\/p>\n<p class=\"p1\"><span class=\"s1\" style=\"font-size: 14pt\"><b><span style=\"color: #000080;text-decoration: underline\">Cell Mechanics<\/span> \u00a0<i> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0<\/i><\/b><\/span><\/p>\n<p class=\"p2\"><span class=\"s2\"><b><i>Cell Adhesion and Spreading<\/i><\/b><\/span><\/p>\n<p class=\"p3\" style=\"text-align: justify\"><span class=\"s2\" style=\"font-family: book antiqua,palatino,serif\">Recently, we have developed a multiscale soft matter model for stem cells or primitive cells in general, aiming at improving the understanding of mechanotransduction mechanism of cells that is responsible for information exchange between cells and their extracellular environment. In this study, we report the preliminary results of our research on multiscale modeling and simulation of soft contact and adhesion of cells. The proposed multiscale soft matter cell model may be used to model soft contact and adhesion between cells and their extracellular substrates. By using the soft matter cell model, we have simulated the soft adhesive contact process between cells and their extracellular substrates. The simulation shows that the cell can sense substrate elasticity by responding in different manners from cell spreading motion to cell contact configurations.\u00a0<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-117\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/application-5_med.png\" alt=\"\" width=\"560\" height=\"188\" srcset=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/application-5_med.png 510w, https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/application-5_med-300x101.png 300w, https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/application-5_med-160x54.png 160w\" sizes=\"(max-width: 560px) 100vw, 560px\" \/><\/p>\n<p class=\"p1\" style=\"text-align: center\"><span style=\"font-size: 10pt\"><em><span class=\"s1\">Soft matter cell model and adhesive contact model<\/span><\/em><\/span><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-2\" width=\"525\" height=\"295\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/shell.mp4?_=2\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/shell.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/shell.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>Cell-substrate adhesion (2D)<\/em><\/span><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-3\" width=\"525\" height=\"295\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/rigid.mp4?_=3\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/rigid.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/rigid.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>Cell spreading (Axisym)<\/em><\/span><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-4\" width=\"525\" height=\"394\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/TT3-B75SS.mp4?_=4\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/TT3-B75SS.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/TT3-B75SS.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>Cell spreading (3D)<\/em><\/span><\/p>\n<p><strong><em>Collective Epithelial Cell Migration<\/em><\/strong><\/p>\n<p style=\"text-align: justify\"><span style=\"font-family: book antiqua,palatino,serif\">Cell migration is a fundamental biological process throughout all the stage of animal life, from its commencement to its end. A variety of complex mechanisms, such as embryonic morphogenesis and wound healing, in development, health and disease depend on the coordinated motion of cell groups. Some cells migrate as individuals, but many cell types will migrate collectively in tightly or loosely associated groups under physiological conditions. Although factors affecting migration of single cell are beginning to be understood, still little is known about motion when cells are in collective groups. To explore the migration behavior of collective cells, the collective epithelial cell migration was studied.<\/span><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-5\" width=\"525\" height=\"394\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/SM1.mp4?_=5\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/SM1.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/SM1.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>Collective migration of\u00a0an epithelial monolayer sheet<\/em><\/span><\/p>\n<p><strong><em>Epithelial Cell Growth and Division<\/em><\/strong><\/p>\n<p style=\"text-align: justify\"><span style=\"font-family: book antiqua,palatino,serif\">Most of the cell proliferation is in the epithelial tissue and around 80% of human cancers progress at epithelial sheets , which results in a popularity of research into epithelial tissue. In epithelial tissues, cells are packed together closely , which is different from cell dispersion in connecting tissue. The behavior of cell ensembles is widely studied by the cell-based models, such as epithelial mono-layers , multi-cell spheroids, and Dictyostelium discoideum slug. Epithelial cell behavior has been studied widely, very little is known about the possible implications of cell pattern geometry for mechanical properties of tissues or key biological processes, such as planar polarization, cell division and tissue remodeling. Thus, cell division and cell-cell interactions also lead to a great deal of interest.<\/span><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-6\" width=\"525\" height=\"295\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/div.mp4?_=6\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/div.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/div.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>Epithelial cell division process in a restricted lattice-based box<\/em><\/span><\/p>\n<p><strong><em><span style=\"color: #000080;text-decoration: underline\">Material Failure Analysis<\/span> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0<\/em><\/strong><\/p>\n<p style=\"text-align: justify\"><span style=\"font-family: book antiqua,palatino,serif\">Failures can occur for many reasons in engineering structures. They include uncertainties in the loading or environment, defects in the materials, inadequacies in design, and deficiencies in construction or maintenance. Large scale destruction has been witnessed in wide ranges of applications involving aeronautics, automobiles, bridges and highways, and great loss has been induced in human life and economics. These disasters may have occurred due to some pre-existing crack or a defect during the production or during service.<\/span><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-7\" width=\"525\" height=\"295\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/t986-0-5.mp4?_=7\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/t986-0-5.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/t986-0-5.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>Crack propagation<\/em><\/span><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-8\" width=\"525\" height=\"394\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/AL3-2.mp4?_=8\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/AL3-2.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/AL3-2.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>Crack nucleation, growth and coalescence<\/em><\/span><\/p>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\">\u00a0<\/span><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-9\" width=\"525\" height=\"295\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/fragmsts16000.mp4?_=9\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/fragmsts16000.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/fragmsts16000.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>High-speed impact induced spall fracture<\/em><\/span><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-10\" width=\"525\" height=\"394\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/COMP-T66.mp4?_=10\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/COMP-T66.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/COMP-T66.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>High-speed impact induced spall fracture in composite materials<\/em><\/span><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-11\" width=\"525\" height=\"394\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/Poly1.mp4?_=11\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/Poly1.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/Poly1.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>Intergranular fracture in polycrystalline Al<sub>2<\/sub>O<sub>3<\/sub><\/em><\/span><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-12\" width=\"525\" height=\"295\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/poly2.mp4?_=12\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/poly2.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/poly2.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>Transgranular fracture in polycrystalline Al<sub>2<\/sub>O<sub>3<\/sub><\/em><\/span><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-13\" width=\"525\" height=\"394\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/polytrans-1.mp4?_=13\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/polytrans-1.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/polytrans-1.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>High-speed impact induced spall fracture in polycrystalline materials<\/em><\/span><\/p>\n<p><strong><em><span style=\"color: #000080;text-decoration: underline\">Multiscale Modeling and Simulation <\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0<\/em><\/strong><\/p>\n<p style=\"text-align: justify\"><span style=\"font-family: book antiqua,palatino,serif\">Both atomistic simulations and classical continuum theories have their limitations, i.e., atomistic simulations can be accurate, but are inefficient and impractical for large systems and long time-scales even with latest computing power; similarly continuum theories are efficient for large systems, however, they are inaccurate for miniaturized devices with atomistic features, major challenges exist for simulating micro\/nano-scale systems over a realistic range of time, length, and temperature. So, different multiscale methods have been developed and it\u00a0bridges various lengths and time scales are central for further advances in micro\/nano-scale systems.<\/span><\/p>\n<p><strong><em>Atomistic Simulation<\/em><\/strong><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-14\" width=\"525\" height=\"295\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/fenk140.mp4?_=14\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/fenk140.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/fenk140.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>BCC to FCC phase transformation in Fe (Tension)<\/em><\/span><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-15\" width=\"525\" height=\"295\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/fet15b.mp4?_=15\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/fet15b.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/fet15b.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>Dislocation evolution &amp; finite size effects (Compression)<\/em><\/span><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-16\" width=\"525\" height=\"394\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/C13.mp4?_=16\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/C13.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/C13.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>Crack propagation<\/em><\/span><\/p>\n<p><strong><em>Coarse-Grained MD<\/em><\/strong><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-17\" width=\"525\" height=\"394\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/cmm_bg258.mp4?_=17\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/cmm_bg258.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/cmm_bg258.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>Uniform compression<\/em><\/span><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-18\" width=\"525\" height=\"394\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/cmm_nk508.mp4?_=18\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/cmm_nk508.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/cmm_nk508.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>Simple\u00a0tension<\/em><\/span><\/p>\n<p><strong><em>Multiscale Modeling<\/em><\/strong><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-19\" width=\"525\" height=\"295\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/mode1.mp4?_=19\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/mode1.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/mode1.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>Simple tension<\/em><\/span><\/p>\n<p><span style=\"color: #000080;text-decoration: underline\"><strong><em>Ferroelectric Material Modeling and Simulation<\/em><\/strong><\/span><\/p>\n<p style=\"text-align: justify\"><span style=\"font-family: book antiqua,palatino,serif\">Based on a shell model potential obtained from first principles calculations, the molecular dynamics simulations were performed to investigate the electromechanical response of a ferroelectricperovskite under finite temperature and electric field. We characterize the switching paths by which a homogeneous\u00a0polarization reorientation process would take place in the prototypical ferroelectric\u00a0PbTiO<sub>3<\/sub>.<\/span><\/p>\n<p style=\"text-align: center\"><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/research\/application-4_med\/\" rel=\"attachment wp-att-126\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-126\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/application-4_med.png\" alt=\"\" width=\"560\" height=\"233\" srcset=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/application-4_med.png 510w, https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/application-4_med-300x125.png 300w, https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/application-4_med-160x67.png 160w\" sizes=\"(max-width: 560px) 100vw, 560px\" \/><\/a><\/p>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>Cubic to tetragonal phase transformation<\/em><\/span><\/p>\n<div style=\"width: 525px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-13-20\" width=\"525\" height=\"394\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/switching.mp4?_=20\" \/><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/switching.mp4\">https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/switching.mp4<\/a><\/video><\/div>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>Polarization switching<\/em><\/span><\/p>\n<p><strong><em><span style=\"color: #000080;text-decoration: underline\">Microcontinuum Theory <\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0<\/em><\/strong><\/p>\n<p style=\"text-align: justify\"><span style=\"font-family: book antiqua,palatino,serif\">Micromorphic theory describes both acoustic and optical vibrations. This dramatically extends the application region to a time scale in accordance with lattice dynamics. However,\u00a0the phonon dispersion relations from experimental measurements and local micromorphic theory can only match well in half of the Brillouin zone, while the matching for the entire Brillouin zone is quite off. When the micromorphic theory is incorporated with the nonlocal theory, the phonon dispersion relations from experimental measurements and from the nonlocal theory match almost perfectly for diamond and quite well for silicon. The nonlocal micromorphic theory thus extends the wavelength region down to scales that lattice dynamics applies. It is therefore believed that the nonlocal micromorphic theory has the great promise and enough accuracy in describing those coupling effects between mechanical, EM and optical behaviors of crystals and extend its application region from microscopic to nanoscopic length scales.<\/span><\/p>\n<p style=\"text-align: center\"><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/research\/screen-shot-2015-06-01-at_med_hr\/\" rel=\"attachment wp-att-127\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-127\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/screen-shot-2015-06-01-at_med_hr.png\" alt=\"\" width=\"560\" height=\"221\" srcset=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/screen-shot-2015-06-01-at_med_hr.png 1020w, https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/screen-shot-2015-06-01-at_med_hr-300x118.png 300w, https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/screen-shot-2015-06-01-at_med_hr-768x303.png 768w, https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/screen-shot-2015-06-01-at_med_hr-160x63.png 160w\" sizes=\"(max-width: 560px) 100vw, 560px\" \/><\/a><\/p>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>Phonon dispersion relations of dimond calculated by local micromorphic\u00a0theory (left) and nonlocal micromorphic theory (right) with fitting in whole BZ<\/em><\/span><\/p>\n<p><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/research\/screen-shot-2015-06-01-at_med_hr-2\/\" rel=\"attachment wp-att-128\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-128\" src=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/screen-shot-2015-06-01-at_med_hr-2.png\" alt=\"\" width=\"560\" height=\"222\" srcset=\"https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/screen-shot-2015-06-01-at_med_hr-2.png 1020w, https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/screen-shot-2015-06-01-at_med_hr-2-300x119.png 300w, https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/screen-shot-2015-06-01-at_med_hr-2-768x304.png 768w, https:\/\/ceid.utsa.edu\/xzeng\/wp-content\/uploads\/sites\/49\/2017\/07\/screen-shot-2015-06-01-at_med_hr-2-160x63.png 160w\" sizes=\"(max-width: 560px) 100vw, 560px\" \/><\/a><\/p>\n<p style=\"text-align: center\"><span style=\"font-size: 10pt\"><em>Phonon dispersion relations of silicon calculated by local micromorphic\u00a0theory (left) and nonlocal micromorphic theory (right) with fitting in whole BZ<\/em><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Research Thrusts Computational Biomechanics (Bone &amp;\u00a0Cell Mechanics) Computational Methods (Meshfree &amp;\u00a0Cohesive Zone Methods) Computational Material Failure Analysis Bioinspired Design of Hybrid Nanocomposites Ferroelectric Materials Modeling and Simulation Multiscale Modeling and Simulation Nanomechanics and Microcontinuum Theory Bone Mechanics\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Modeling and Simulation of Osteoporosis in Trabecular Bone Osteoporosis is a skeletal disease characterized by a decrease in &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/ceid.utsa.edu\/xzeng\/research\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Research&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-13","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Research - Xiaowei Zeng<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ceid.utsa.edu\/xzeng\/research\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Research - Xiaowei Zeng\" \/>\n<meta property=\"og:description\" content=\"Research Thrusts Computational Biomechanics (Bone &amp;\u00a0Cell Mechanics) Computational Methods (Meshfree &amp;\u00a0Cohesive Zone Methods) Computational Material Failure Analysis Bioinspired Design of Hybrid Nanocomposites Ferroelectric Materials Modeling and Simulation Multiscale Modeling and Simulation Nanomechanics and Microcontinuum Theory Bone Mechanics\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Modeling and Simulation of Osteoporosis in Trabecular Bone Osteoporosis is a skeletal disease characterized by a decrease in &hellip; 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