金属材料弹塑性参数仪器化聚集式Vickers压入识别方法  

Method for determining elastic-plastic parameters of metals by instrumented gathered indentation with Vickers indenter

作　　者：石新正 陈伟 陈平 马德军 孙亮 SHI Xin-zheng;CHEN Wei;CHEN Ping;MA De-jun;SUN Liang(Department of Mechanical Engineering,Academy of Army Armored Force,Beijing 100072,China;Department of Basic,Academy of Army Armored Force,Beijing 100072,China)

机构地区：[1]陆军装甲兵学院车辆工程系,北京100072 [2]陆军装甲兵学院基础部,北京100072

出　　处：《中国有色金属学报》2019年第11期2582-2593,共12页The Chinese Journal of Nonferrous Metals

摘　　要：选用单一Vickers压头对被测材料实施压痕具有特殊位置关系的三次仪器化压入实验,根据第三次载荷-位移曲线和初次载荷-位移曲线提出一个独立的仪器化压入响应参数-第三次和初次仪器化压入比功之比[(We/Wt)3/(We/Wt)1]。基于量纲分析和有限元仿真,建立初次仪器化压入比功(We/Wt)1、第三次和初次仪器化压入比功之比[(We/Wt)3/(We/Wt)1]、初次仪器化压入名义硬度H0与材料弹塑性参数之间的无量纲函数关系,并以此为基础建立了金属材料弹塑性参数仪器化聚集式Vickers压入识别方法。该方法仅利用单一Vickers压头便可识别被测材料的应变硬化指数n、弹性模量E、条件屈服强度σ0.2和强度极限σb,并且通过实验验证了此方法的有效性。Using single Vickers indenter,three instrumented indentation experiments of which indentation impressions have special position relationships were conducted.[(We/Wt)3/(We/Wt)1]was introduced as an independent instrumented indentation response parameter according to the third load-displacement curve and the first load-displacement curve.Based on dimensional analysis and finite element simulations,the dimensionless relationships among three independent instrumented indentation response parameters(the other two parameters are the first ratio of indentation work(We/Wt)1and nominal hardness H0 of first instrumented indentation)and the elastic-plastic parameters were established.Therefore,the method for determining elastic-plastic parameters of metals by instrumented gathered indentation with Vickers indenter was proposed.The strain hardening exponent n,elastic modulus E,conditional yield strengthσ0.2 and ultimate strengthσb of metals can be identified by using the load-displacement curves obtained from instrumented gathered indentation with Vickers indenter.The effectiveness of the method is validated by the tests.

关 键 词：仪器化聚集式压入 金属材料 弹塑性参数 

分 类 号：TH140[一般工业技术—材料科学与工程]