Assessment of strain energy on mechanically-loaded materials and structures using a Constitutive Equation Gap inverse method
讲座名称：
Assessment of strain energy on mechanically-loaded materials and structures using a Constitutive Equation Gap inverse method
讲座时间：
2017-09-26
讲座人：
Bertrand WATRRISSE
形式：
校区：
兴庆校区
实践学分：
讲座内容：
报告题目：Assessment of strain energy on mechanically-loaded materials and structures using a Constitutive Equation Gap inverse method
报告时间：2017年9月26日上午09:40-10:10
报告地点：基础学科大楼B241
报告人：法国蒙彼利埃大学 Bertrand WATRRISSE博士
报告摘要:
Energy balances constitute a very efficient tool to characterize the thermo-mechanical response of materials. They require the estimation of the different energies involved during the loading. These energies have to be locally assessed to take into account the heterogeneous response of the specimen in a real (imperfect) situation. The estimation of deformation energy is particularly challenging since it requires the estimation of the stress field that is not directly measurable in most situations.
This presentation will present a strategy proposed for identifying the shape and the parameters of constitutive equations for heterogeneous materials in addition to the stress field locally developed by the material. The method is based on the constitutive equation gap principles and it relies on the knowledge of mechanical kinematic fields (displacement or strain fields obtained by DIC for example) and of the loading (stress-free boundary location, overall applied load …). Combing the stress and strain fields then gives access to the strain energy locally developed by the material during the transformation.
The general framework of this method will be presented and we will focus on its implementation for elastoplastic behaviors. The procedure is then based on the iterative minimization of an energy norm involving the secant elastoplastic tensor.
We will insist on the performances of the procedure for locally identifying heterogeneous property fields and on its robustness and its stability with respect to experimental noise.
Finally, results obtained on various experimental tests with different specimen geometries will be presented.
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