(1. 装甲兵工程学院 机械工程系，北京 100072；
2. 陆军航空兵研究所 信息情报室，北京 101121)
摘 要: 针对Berkovich压痕提出一个独立的仪器化压入响应参数-中边距与名义中边距之比d/dn，用于衡量压痕鼓凸/沉陷程度。基于量纲分析和有限元数值仿真，建立中边距与名义中边距之比d/dn、名义硬度Hn、比功We/Wt与金属材料弹塑形参数之间的无量纲函数关系式，并以此为基础建立了基于Berkovich压痕的金属材料弹塑形参数仪器化压入识别方法。该方法仅利用单一Berkovich压头仪器化压入金属材料所得载荷-位移曲线及Berkovich压痕即可确定金属材料的弹性模量E、应变硬化指数n、条件屈服强度σ0.2及强度极限σb。4种常用金属结构材料弹塑性参数的仪器化压入识别结果验证了该方法的有效性。
关键字: 金属材料；仪器化压入；压痕；弹塑性参数
（1. Department of Mechanical Engineering, Academy of Armored Force Engineering, Beijing 100072, China;
2. Information and Intelligence Unit, Army Aviation Research Institute, Beijing 101121, China）
Abstract:The ratio of the center-to-border distance of Berkovich indentation impression to the nominal center-to-border distance was introduced as an independent instrumented indentation response parameter to describe the extent of pile-up/sink-in around Berkovich indentation impression. Based on the dimensional analysis and finite element simulations, the explicitly dimensionless relationships among three independent instrumented indentation response parameters (the other two parameters extracted from load-depth curve are nominal hardness and the ratio of elastic work to total work) and elastic-plastic properties of metals were established. Further more, a new method based on Berkovich indentation impression was proposed for determining elastic modulus E, strain hardening exponent n, conditional yield strength σ0.2, ultimate strength σb of metals. Finally, the effectiveness of the method was verified by the determination results of four kinds of structural metal.
Key words: metal; instrumented indentation; indentation impression; elastic-plastic properties
