基于仪器化压入测试方法的材料强度极限的测定

本资料包含pdf文件1个，下载需要1积分

Both the approximate analytical analysis and the numerical calculation have been used to analyze indentation of elastic-plastic materials with Berkovich indenter. The results confirm that there exists an approximate one-to-one correspondence between the ratio of tensile strength/Oliver and Pharr indentation hardness （σE,b/Ho＆p） and the ratio of elastic work/total work （We/W）. For widely used structural materials （strain-hardening exponent, n, is varied from 0 to 0.25）, the best fits to the correspondence is derived. According to this relationship, the tensile strength can be obtained by indentation test. This argument is supported by the experimental data of stress-strain tests and indentation tests of aluminum alloys.通过对弹塑性材料在Berkovich压头作冉下的压八响应的量纲分析和有限元数值模拟表明，在材料强度极限和Oliver＆Pharr硬度的比值（σE，b/Ho＆p）与仪器化压入弹性功与总功的比值（we／W）之间存在简单的近似函数关系。针对常用的工程结构材料（应变硬化指数n介于0到0．25之间），得出了以上关系的最佳拟合关系式。据此，材料的强度极限可以由压入测试获得，铝合金的单轴拉伸与纳米压入实验证实了上述函数关系的正确性。