平头压痕蠕变的试验和数值研究  

EXPERIMENTAL AND NUMERICAL STUDY ON INDENTATION CREEP WITH A FLAT INDENTER

作　　者：刘勇俊[1] 赵彬[1] 岳珠峰[1] 

机构地区：[1]西北工业大学力学与土木建筑学院,西安710072

出　　处：《机械强度》2008年第5期854-859,共6页Journal of Mechanical Strength

基　　金：国家自然科学基金(50375124;10472094);国家航空基金资助项目(03B53003)~~

摘　　要：通过对LY12CZ的平头压痕蠕变和单轴拉伸蠕变行为的比较,主要研究工程材料LY12CZ的压痕蠕变行为。首先对压痕蠕变试验和单轴蠕变试验进行研究,通过试验得出材料蠕变参数及其压痕蠕变参数。其次,通过有限元(fi-nite element method,FEM)分析对压痕蠕变进行模拟,也得出材料的压痕蠕变参数,以上都得出相同温度下由压痕蠕变试验和单轴拉伸蠕变试验得出的应力指数是相等的结论,同时利用转化因子验证压痕蠕变试验和单轴蠕变试验的一致性和等效性,从而证实由压痕蠕变试验描述蠕变是合适的,并且能够确定材料的蠕变参数。The indentation and uniaxial creep behavior of Aluminum alloy LY12CZ were compared. Firstly, indentation creep and tmiaxial creep experiments were studied, from the uniaxial tensile creep and indentation creep results, the material creep parameters and indentation creep parameters were derived. Secondly, the indentation creep testing was simulated by the finite element method （FEM）, from indentation creep calculation results, the material indentation creep parameters were also derived. They are both shown that the stress exponent determined from indentation and uniaxial creep testing is identical, respectively, at a same temperatttre. The consistency and equivalence between the indentation and uniaxial creep experiments are verified by conversion factor. The good agreement of creep parameters obtained from indentation and conversional uniaxial creep testing demonstrates that indentation creep testing is suitable to characterize creep, and it is also confirmed that the material＇ s creep factor and stress exponent can be determined from indentation creep testing.

关 键 词：平头压痕蠕变 单轴拉伸蠕变 LY12CZ有限元法 蠕变常数 蠕变应力指数 

分 类 号：TG132.3[一般工业技术—材料科学与工程] TB115[金属学及工艺—合金]