|
摘要：
|
|
弹性模量是影响冲压回弹量的重要材料性能参数,在工程应用和回弹数值模拟中一般认为弹性模量为常数。而实际上,弹性模量随塑性变形的增大不断变化,因此其变化对工程中的回弹量评估和数值模拟回弹预测精度有很大的影响。本文针对在汽车和航空工业中广泛应用的铝合金和钢板,采用动力试验方法,对ST14钢及3A21、2024-T3和2A12铝合金的弹性模量在塑性变形中的变化规律进行了试验研究,得到了弹性模量值与等效塑性应变的变化规律,并采用分段线性函数进行了描述。研究结果为进一步研究弹性模量随塑性变形的变化规律及探讨其本质提供了依据,也预示了一种提高有限元回弹预测精度的解决办法。
|
|
Young's modulus is an important material property parameter which affects springback of stamping.In the engineering application and springback simulation,Young's modulus is considered as constant.But actually Young's modulus continually changes as plastic deformation increases.Therefore,it makes great effect on the springback evaluation of engineering and accuracy of springback prediction.Dynamic experimental method was applied to explore the variation law of Young's modulus and plastic deformation.Experimental research was carried out on 2024 aluminum alloy,2A12 aluminum alloy,3A21 aluminum alloy and ST14 steel.Then the variation law of Young's modulus and equivalent plastic strain was obtained,and piecewise linear function was used to describe the variation law.Research result supplies basis for deeply studying on the variation law of Young's modulus and plastic deformation,and also indicates a method to improve the accuracy of springback prediction.
|
|
基金项目：
|
|
十一五国家科技支撑计划资助项目(2006BAFO4B14);;
塑性成形模拟及模具技术国家重点实验室开放基金资助项目(06-13)
|
|
作者简介：
|
|
|
|
参考文献：
|
[1]官英平,张庆,赵军.中性层内移对弯曲回弹的影响[J].锻压技术,2007,32(2):26-27.
[2]李雪春,杨玉英,包军.弹性模量与塑性变形关系的探讨[J].哈尔滨工业大学学报,2000,31(5):54-56.
[3]胡平,连建设,李运兴.弹塑性有限变形的拟流动理论[J].力学学报,1994,26(3):275-283.
[4]Morestin F,Boivin M,Silva C.Elasto plastic formulation u-sing a kinematic hardening model for spring analysis in sheetmetal forming[J].Journal of Materials Processing Technolo-gy,1996,56(1-4):619-630.
[5]DeVin L J,Streppel A H,Singh U P,et al.A processmodel for air bending[J].Journal of Mater Processing Tech-nology,1996,57(1-2):48-54.
[6]Fusahito Yoshida,Takeshi Uemori,Kenji Fuji wara.Elastic-plastic behavior of steel sheets under in-plane cyclic tension-compression at large strain[J].International Journal of Plas-ticity,2002,18(5-6):63-65.
[7]GB/T228-2002,金属材料室温拉伸试验方法.
|
|
服务与反馈：
|
|
【本网站尚未开通全文下载服务】【加入收藏】
|
|
|
|
