Full-field kinematic, thermal and calorimetric measurements to characterize the thermomechanical behavior of solid materials

讲座名称: Full-field kinematic, thermal and calorimetric measurements to characterize the thermomechanical behavior of solid materials
讲座时间 2017-09-26
讲座地点 基础学科大楼B241
讲座人 Bertrand WATRRISSE
讲座内容
报告题目:Full-field kinematic, thermal and calorimetric measurements to characterize the thermomechanical behavior of solid materials
报告时间:2017年9月26日 上午09:00-09:30
报告地点:基础学科大楼B241
报 告 人:法国蒙彼利埃大学 Bertrand WATRRISSE
报告摘要:
During a mechanical test, the material transforms the received mechanical energy into different forms of energy (elastic energy, stored energy, heat …). The conversion of mechanical energy into heat has been investigated in a wide range of materials by numerous authors. Naturally, the way the mechanical energy is partitioned characterizes the material behavior as a whole. The construction of the energy balance associated with a mechanical loading requires the determination of several “measurable” quantities (overall deformation, temperature) but also of non-measurable ones (stresses). These latter can be “easily” obtained during simple (uniaxial) tests on homogeneous specimens but their estimation is quite more difficult in heterogeneous situations that are far more common in practice (localization, complex loading …).
The combined use of imaging techniques such as Digital Image Correlation and Infrared Thermography allows reaching fields of deformation and temperature measurements even in the presence of highly localized material responses. Apart from the technical difficulties inherent to the simultaneous use of cameras working in different wavelength ranges – which requires temporal (synchronous) and spatial matching, and ad hoc lighting –, it is necessary to develop adapted data processing techniques to extract the relevant thermo-mechanical quantities from the recorded images. These data-processing are often related to inverse problem solving (such as heat equation inversion or mechanical inversion). This presentation will focus on the experimental strategy proposed to reach the local fields necessary to characterize the thermo-mechanical behavior of the material during a mechanical test: displacement and strain fields, temperature, heat sources…

 

讲座人介绍

Bertrand WATRRISSE,法国蒙彼利埃大学。

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