应航天航空学院和强度与振动教育部重点实验室邀请，美国内布拉斯加大学(University of Nebraska-Lincoln) M. Negahban教授将来我校访问并开展学术交流。
报告时间：2008年5月26日（星期一）下午3：00
报告地点：教一楼南208（强度与振动教育部重点实验室会议室）
报告题目：Experimental characterization and constitutive modeling of polycarbonate under large strains and rapid loads
Abstract
We look at polycarbonate (PC) as a model glassy polymer material and examine its response to changes in loading rate, loading direction, and temperature. We show that plastic flow in compression is accompanied by a change in the elastic response of PC from isotropic to anisotropic. This provides the necessity to introduce a new modeling method that can capture these changes. A finite-deformation plasticity-like thermodynamically consistent model is developed to capture this and the observed rate and temperature dependence. For this modeling method, we need to provide expressions for the elastic response, flow of the plastic deformation gradient, and also provide methods to calculate the back-stress. In this context, we look at experimental methods to characterize these parameters.
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报告人简介
Dr. Mehrdad Negahban is an Associate Professor of Engineering Mechanics at the University of Nebraska-Lincoln, the Director of the Engineering Mechanics Graduate Program, the Chair of the International Programs Committee of the