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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第24卷    第4期    总第181期    2014年4月

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文章编号:1004-0609(2014)04-0958-16
金属材料塑性参数仪器化压入识别方法
马德军,陈 伟,宋仲康,郭俊宏

(装甲兵工程学院 机械工程系,北京 100072)

摘 要: 采用有限元数值仿真结合仪器化压入实验的方法,选择Vickers压头和面角为172°的四棱锥压头用于金属材料塑性参数的仪器化识别,通过量纲分析和有限元数值仿真建立基于压入比功We/Wt的金属材料塑性参数仪器化压入识别方法和基于名义硬度Hn的金属材料塑性参数仪器化压入识别方法。根据识别方法的精度分析结果,确定条件屈服强度σ0.2和应变硬化指数n作为金属材料塑性参数识别的目标参数。6061铝合金、S45C碳钢、SS316不锈钢、SS304不锈钢和黄铜5种金属材料条件屈服强度σ0.2的识别误差为-17.5%~4%,基本满足工程需要,验证本研究中建立的金属材料塑性参数仪器化压入识别方法的有效性。

 

关键字: 塑性;仪器化压入;屈服强度;应变硬化指数;特征应力;特征应变

Method for determining plastic properties of metals by instrumented indentation
MA De-jun, CHEN Wei, SONG Zhong-kang, GUO Jun-hong

Department of Mechanical Engineering, Academy of Armored Force Engineering, Beijing 100072, China

Abstract:The instrumented indentation is a useful tool to probe the plastic properties of metals. The finite element computations combined with instrumented indentation experiments were applied to choose the diamond indenters which were used to estimate the plastic properties of metals. The methods for determining the plastic properties of metals based on the ratio of indentation work We/Wt and nominal hardness Hn were established with the aid of dimensional analysis and finite element computations. 0.2% yield strength (σ0.2) and strain hardening exponent (Hn) were suggested to be the target parameters based on the accuracy analysis of the methods. The errors of σ0.2 of 6061 aluminum alloy, S45C carbon steel, SS316 stainless steel, SS304 stainless steel and brass are from -17.5% to 4%, which satisfies the need of engineering application. This verifies the effectiveness of the methods.

 

Key words: plastic properties; instrumented indentation; yield strength; strain hardening exponent; representative stress; representative strain

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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