利用小尺寸缺口试样测定延性材料的单轴本构关系

提出了一种利用三点弯曲试样获取延性材料本构关系的测试方法：针对小尺寸缺口试样的三点弯曲线载荷-位移曲线，采用有限元辅助测试（Finite-element-analysis aided tests，FAT）方法，迭代获得材料代表性体积单元（Representative volume element，RVE）本构关系。研究表明，两种延性材料的有限元迭代反求结果和单轴拉伸试验结果吻合较好。应用该方法，可以采用小尺寸缺口试样来获取延性材料的本构关系。

Obtaining Uniaxial Constitutive Relationships of Ductile Materials by Using Small-scale Notched Bending Specimens

A test method is proposed to obtain uniaxial constitutive relationships of ductile materials by using the small-scale bending specimens with a semi-circle notch.Linear load-displacement experimental curves of the specimens under three-point bending tests are taken as the iterative referenced target so that RVE (Representative volume element)uniaxial constitutive relationships of the ductile materials are obtained by the FAT (Finite-element-analysis aided tests)method.It is shown that the uniaxial constitutive relationships for two kinds of ductile materials by finite-element-analysis are in good agreement with the standard tensile results.Therefore,the method for the small-scale specimens can be conveniently used to get the uniaxial constitutive relationships for ductile materials.