(1. 陸軍裝甲兵學(xué)院 車輛工程系，北京 100072；
2. 陸軍裝甲兵學(xué)院 基礎(chǔ)部，北京 100072)
摘 要: 選用單一Vickers壓頭對被測材料實(shí)施壓痕具有特殊位置關(guān)系的三次儀器化壓入實(shí)驗(yàn)，根據(jù)第三次載荷-位移曲線和初次載荷-位移曲線提出一個(gè)獨(dú)立的儀器化壓入響應(yīng)參數(shù)-第三次和初次儀器化壓入比功之比[(We/Wt)3/(We/Wt)1]。基于量綱分析和有限元仿真，建立初次儀器化壓入比功(We/Wt)1、第三次和初次儀器化壓入比功之比[(We/Wt)3/(We/Wt)1]、初次儀器化壓入名義硬度H0與材料彈塑性參數(shù)之間的無量綱函數(shù)關(guān)系，并以此為基礎(chǔ)建立了金屬材料彈塑性參數(shù)儀器化聚集式Vickers壓入識別方法。該方法僅利用單一Vickers壓頭便可識別被測材料的應(yīng)變硬化指數(shù)n、彈性模量E、條件屈服強(qiáng)度σ0.2和強(qiáng)度極限σb，并且通過實(shí)驗(yàn)驗(yàn)證了此方法的有效性。
關(guān)鍵字: 儀器化聚集式壓入；金屬材料；彈塑性參數(shù)
（1. Department of Mechanical Engineering, Academy of Army Armored Force, Beijing 100072, China;
2. Department of Basic, Academy of Army Armored Force, Beijing 100072, China）
Abstract: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 strength σ0.2 and ultimate strength σb 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.
Key words: instrumented gathered indentation; metal; elastic-plastic parameters
