基于位错密度的流动应力模型的研究  

Study on flow stress model based on dislocation density

作　　者：杜大鹏[1] 董湘怀[1] 

机构地区：[1]上海交通大学模具CAD国家工程研究中心,上海200030

出　　处：《模具技术》2010年第3期6-8,33,共4页Die and Mould Technology

摘　　要：研究纯铜温镦粗试验,基于K-M-E模型建立了加工硬化率—位错密度和加工硬化率—应变模型。并把K-M-E模型嵌入有限元软件ABAQUS,通过试验检测和数值模拟,研究了显微硬度—流动应力、显微硬度—位错密度关系。结果表明,各个理论模型与试验结果较好吻合。显微硬度与流动应力成正比,与位错密度平方根成正比。Through copper upsetting tests, the work-hardening rate-dislocation density model and work-hardening rate-strain model were established based on K-M-E model. Through writing the K-M-E model into the finite element software ABAQUS, the relations of micro- hardness-flow stress and micro-hardness-dislocation density were then researched based on tests and numerical simulations. The results showed that the theoretical models were in good accordance with the experimental results. Micro-hardness was proportional to flow stress, and was inversely proportional to the square root of dislocation density.

关 键 词：位错密度 K—M—E模型 加工硬化率 显微硬度 

分 类 号：TG111.2[金属学及工艺—物理冶金]