虚位移场方法在石墨材料力学参数测量中的应用  

Application of Virtual Displacement Field for the Mechanical Property Measurement of Graphite Material

作　　者：郭保桥[1,2] 陈鹏万[1] 谢惠民[2] 戴福隆[2] Fabrice PIERROM 

机构地区：[1]北京理工大学机电学院爆炸科学与技术国家重点实验室,北京100081 [2]清华大学工程力学系教育部应用力学重点实验室,北京100084 [3]巴黎高科集团高等技术学院力学与制造过程实验室,法国香槟一沙隆市51006

出　　处：《实验力学》2011年第5期565-572,共8页Journal of Experimental Mechanics

基　　金：国家自然科学基金(10832003);国家重点基础研究发展计划(2011CB606105)资助

摘　　要：光测实验技术在现代力学研究中得到了广泛的应用。对于材料力学参数如杨氏模量和泊松比的测量,可利用典型加载试验如拉伸试验、弯曲试验并结合光测方法(如云纹和数字图像相关技术)得到位移值,利用载荷信息和应变场信息通过计算获得相关的力学参数。本文利用虚位移场方法测量石墨材料的力学参数。结合石墨材料的三点弯曲实验,由数字图像相关法测量得到试件表面的非均匀变形场。通过选择两组不同的虚位移场,可以反算出材料的力学参数:杨氏模量和泊松比。结果表明这种方法可以有效测量石墨材料的弹性参数。该方法可望在材料力学行为检测中得到推广应用。Optical full-field measurement is now widely applied in modern experimental mechanics. Mechanical constitutive parameters measurement, such as Young＇s modulus and Poisson＇s ratio are first focused on displacement values based on typical loading experiment including tension test or bending test combined with optical measurement （Moire technique and digital image correlation technique）, then the parameters can be identified by calculation by using the load and the strain informations. In this paper, a so-called virtual displacement field method for graphite material constitutive parameters identification is presented. Non-uniform deformation field on specimen surface were measured by the digital image correlation technique, based on three-point bending test of graphite material specimen. By selecting two groups of different virtual displacement field, elastic parameters （Young＇s Moduls and Poisson＇s ratio） can be inversed. Results show that the elastic parameters of graphite can be successfully identified by this method. Virtual displacement field method has a good potential in further application of material mechanical behavior inspection.

关 键 词：虚位移场方法 光测力学 本构参数 反问题 非均匀变形场 

分 类 号：O34[理学—固体力学]