预测金属材料拉伸性能的圆台形平面压入方法  

TRUNCATED CONE FLAT INDENTATION METHOD FOR PREDICTING MECHANICAL PROPERTIES OF METALLIC MATERIALS

作　　者：陈辉 范中天 彭晖[1,2] 孟铮 傅作华 李微 CHEN Hui;FAN Zhong-tian;PENG Hui;MENG Zheng;FU Zuo-hua;LI Wei(Key Laboratory of Safety Control of Bridge Engineering,Ministry of Education,Changsha University of Science&Technology,Changsha,Hu’nan 410114,China;School of Civil Engineering,Changsha University of Science&Technology,Changsha,Hu’nan 410114,China;School of Energy and Power Engineering,Changsha University of Science&Technology,Changsha,Hu’nan 410114,China)

机构地区：[1]长沙理工大学桥梁工程安全控制教育部重点实验室,湖南长沙410114 [2]长沙理工大学土木工程学院,湖南长沙410114 [3]长沙理工大学能源与动力工程学院,湖南长沙410114

出　　处：《工程力学》2024年第11期207-216,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(52178186,12232004,12402078);湖南省自然科学基金项目(2021JJ40553);湖南省教育厅优秀青年基金项目(20B028)。

摘　　要：相比锥形、球形压入,平面压入具有稳定的接触区域及明显的线弹性阶段,有利于更稳定地实现材料弹塑性参数的一体化表征。然而,目前金属材料的圆柱平面压入方法仍存在接触刚度偏大、压头变形损耗较高等不足,故有必要发展一种接触刚度更小、预测精度更高的力学性能测试方法。该文采用含60°锥角的圆台形平压头,通过有限元分析证明了其相比圆柱形平压头具有对钝化的弱敏感性。基于能量等效理论,建立了关联压头端部直径、压入功、压入深度和弹塑性参数的圆台形平面压入(Truncated Cone Flat Indentation,TCFI)理论模型,通过较大参数范围的有限元计算和5种金属材料的圆台形平面压入试验、拉伸试验验证了该模型的准确性。Compared with conical and spherical indentation,flat indentation has a stable contact area and an obvious linear elastic stage,which are beneficial to realize the integrated characterization of material elasticplastic parameters more stably.However,the current flat indentation testing methods of metal materials still have some shortcomings,such as large contact stiffness and high deformation loss of indenter.Therefore,it is necessary to develop a mechanical property testing method with smaller contact stiffness and higher prediction accuracy.A truncated cone flat indenter with a cone angle of 60°was thusly used,and the finite element analysis proved that it has a weak sensitivity to tip rounding compared with cylindrical flat indenter.Based on the equivalent energy principle,a theoretical model of truncated cone flat indentation(TCFI)was established,which is associated with the diameter of the indenter,indentation work,depth,and the elastic-plastic parameters of materials.A testing method for mechanical properties of materials based on the model was proposed,and the accuracy of the method was verified by the finite element calculation in a wide range of parameters and by the indentation test and tensile test of 5 metallic materials.

关 键 词：拉伸性能 能量等效理论 圆台形平面压入 有限元分析 压头钝化 

分 类 号：O34[理学—固体力学]