A universal relationship between indentation hardness and flow stress
作者单位：University of CaliforniaSanta BarbaraCA 93106USA
会议日期：2007年
学科分类：08[工学] 080104[工学-工程力学] 0801[工学-力学（可授工学、理学学位）]
基 金：supported by the US Department of Energy Office of Fusion Science(Grant #DE-FG03-94ER54275)
关 键 词：hardness indentation finite element analysis strain hardening irradiation effects
摘 要：A new indentation hardness(H) approach to evaluating the true stress(σ)-true plastic strain (ε) constitutive behavior of materials is *** elastic-plastic finite element(FE) simulations were carried out to assess the relation between H andσ(ε).The analysis led to derivation of a universal relation between H andσ(ε) given by H≈4.05(1-34.6σ/E)σ,whereσ=σ+〈σ〉,〈σ〉is the average strain hardening betweenε=0 and 0.1,and E is the elastic *** H-σ data pairs for the large set of alloys are in reasonably good agreement with the model predictions,but the experimentalσ are slightly higher and more linearly related to H than *** H-σ relation provides insight into the large variation of the H/σ ratios that are observed for different materials,as well as the corresponding variation in the△H/△σ ratios used to estimate△σ due to changes in an alloy’s condition,such as that induced by irradiation,based on measurements of△***,combinations of tensile and hardness tests can be use to estimate the average strain hardening fromε=0 to 0.1 in irradiated alloys that have very small uniform strains.