(裝甲兵工程學(xué)院 機(jī)械工程系，北京 100072)
摘 要: 應(yīng)用量綱定理和有限元方法對儀器化壓入響應(yīng)進(jìn)行分析，同時引入聯(lián)合彈性模量(Ec)來精確表示壓頭與被壓材料的綜合彈性效應(yīng)。結(jié)果表明：名義硬度Hn和聯(lián)合彈性模量Ec的比值與卸載功We和壓入總功Wt的比值間存在近似的函數(shù)關(guān)系。基于上述關(guān)系，提出由名義硬度和壓入比功確定材料彈性模量的新方法，同時分析該方法的理論誤差，驗(yàn)證結(jié)果表明該方法較傳統(tǒng)Oliver-Pharr方法具有更高的測試精度。
關(guān)鍵字: 彈性模量；儀器化壓入；硬度；壓入功；有限元方法
（Department of Mechanical Engineering, The Academy of Armored Forces Engineering, Beijing 100072, China）
Abstract:The instrumented indentation tests were analyzed by employing dimensional theorem and finite element method. A combined elastic modulus, Ec, was introduced to accurately reflect the combined elastic effect of an indenter and an indented material. Consequently, an approximate relationship between the ratio of nominal hardness to the combined elastic modulus and the ratio of unloading work to total work in indentation was revealed. Based on the relationship, a new method was then proposed for determining elastic modulus of materials, and its accuracy was analyzed. The effectiveness of the method was examined by several experimental examples.
Key words: elastic modulus; instrumented indentation; hardness; indentation work; finite element method
