热压缩实验误差定量分析及修正软件开发  

Quantitative analysis on hot compression test erro and software development for correction

作　　者：刘晓飞[1] 张艳姝[1] 

机构地区：[1]机械科学研究总院先进制造技术研究中心,北京100083

出　　处：《锻压技术》2013年第1期147-154,共8页Forging & Stamping Technology

基　　金：国家重大专项热锻工艺全过程数值模拟及优化软件开发与工程应用(2011ZX04014051);国家重大专项:先进成形制造全流程建模与仿真创新平台(2012ZX04012011);973计划金属材料智能制备成形技术的基础研究(2011CB606306)

摘　　要：由于摩擦、非恒定应变速率、变形能生热及试样高度误差等因素的影响,使得材料热压缩实验的实验数据与真实数据存在误差,本文引入两者的比值η为参数,定量分析了上述4类因素对实验结果的影响程度,同时分析了误差产生的原因,并提出了消除或减小误差的实验措施。分析结果表明,在真应变为1.0时,4类因素综合引起的相对误差η=0.520～2.195。介绍了4类误差的数学修正算法,其中对温度和应变速率引起的误差修正,采用双曲正弦应力本构模型进行插值,取得了较好结果。在此基础上,开发了热压缩实验修正软件"RightStress",通过算例验证了软件的可靠性。Owing to the influence factors, such as friction, variable strain rate, deformation heat generation, height error of the specimen etc. , there exists error between the experiment data and the true value. The incidence of the men- tioned four factors on experiment results was quantitativly analyzed by quoting a parameter for the ratio of experimental and true value η, the reasons that result in the error was analyzed also and the measurements that eliminate or decrease the error were put forward. The results show that the η is around 0. 520 - 2. 195 when true strain is 1.0. An error compensation method was introduced. An interpolate method was applied on the function of Hyperbolic Sine, and the results show a good agreement between calculation and experiment. Based on the above, the software ＂RightStress＂ for experimental data correction was developed, whose reliability was proved by testing.

关 键 词：热压缩实验 流动应力 误差修正 软件开发 

分 类 号：TP319[自动化与计算机技术—计算机软件与理论] TB30[自动化与计算机技术—计算机科学与技术]