锆合金薄板带材冲制成形研究
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摘要
采用数值模拟和实验验证相结合的方法,研究带材性能参数对锆合金薄板冲制成形影响。揭示了硬化指数与屈强比对壁厚分布均匀性和最大主应变影响规律,提出了保证锆合金薄板带材稳定冲制的关键性能指标及其控制范围。结果表明,硬化指数n与壁厚分布均匀性密切相关,n值越大,壁厚差越小,壁厚分布越均匀;屈强比与最大主应变密切相关,屈强比越小,最大主应变越小,壁厚分布越均匀;提高硬化指数或减小屈强比,均使锆合金薄板带材安全裕度提高;在安全裕度为10%的条件下,锆合金稳定冲制的关键性能参数范围为:硬化指数n≥0.18,屈强比≤0.68。实验验证结果与仿真模拟结果相吻合。
The effect of stripe performance parameters on the punching of zirconium alloy sheet was investigated by numerical simulation combined with experimental approaches.The influence of hardening index and yield ratio on the uniformity of thickness distribution and the maximum principal strain was revealed.The key performance indexes to ensure the stable punching of the zirconium alloy sheet and their ranges were proposed.The results show that the hardening index is closely related to the uniformity of the thickness distribution.The larger hardening index is,the smaller the thickness difference is,and the more uniform thickness distribution is.The yield ratio is closely related to the maximum principal strain.The smaller the yield ratio is,the smaller the maximum principal strain is,and the more uniform the wall thickness distribution is.Both increasing the hardening index or reducing the yield ratio can increase the safety margin of the zirconium alloy sheet and stripe.Under the safety margin of 10%,the critical performance parameters for zirconium alloy to be punched stable are the hardening index n≥0.18 and yield ratio ≤0.68.The experimental verification results are identical with simulation results.
The effect of stripe performance parameters on the punching of zirconium alloy sheet was investigated by numerical simulation combined with experimental approaches.The influence of hardening index and yield ratio on the uniformity of thickness distribution and the maximum principal strain was revealed.The key performance indexes to ensure the stable punching of the zirconium alloy sheet and their ranges were proposed.The results show that the hardening index is closely related to the uniformity of the thickness distribution.The larger hardening index is,the smaller the thickness difference is,and the more uniform thickness distribution is.The yield ratio is closely related to the maximum principal strain.The smaller the yield ratio is,the smaller the maximum principal strain is,and the more uniform the wall thickness distribution is.Both increasing the hardening index or reducing the yield ratio can increase the safety margin of the zirconium alloy sheet and stripe.Under the safety margin of 10%,the critical performance parameters for zirconium alloy to be punched stable are the hardening index n≥0.18 and yield ratio ≤0.68.The experimental verification results are identical with simulation results.
引文
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[4]邹东利,栾佰峰,肖东平.应变速率对锆合金塑性变形机制的影响[J].稀有金属材料与工程,2014,43(8):1897-1901.ZOU Dongli,LUAN Baifeng,XIAO Dongping.Effects of strain rate on plastic deformation mechanism of zircaloy[J].Rare Metal Materials and Engineering,2014,43(8):1897-1901.
[5]YU H,DONG Q,YAO Z,et al.Stacking faults observed in{101-2}extension twins in a compressed high Sn content Zr alloy[J].Scripta Materialia,2017,141:72-75.
[6]邱志聪,何立峰,肖大武,等.温度及加载速率对U-5.7%Nb合金变形行为的影响[J].稀有金属材料与工程,2014,43(11):2829-2835.QIU Zhicong,HE Lifeng,XIAO Dawu,et al.Effect of temperature and loading rate on deformation behavior of U-5.7%Nb alloy[J].Rare Metal Materials and Engineering,2014,43(11):2829-2835.
[7]刁可山,曹猛,蒋浩民,等.DP600高强钢零件冲压成形有限元仿真及试验[J].塑性工程学报,2010,17(3):66-69.DIAO Keshan,CAO Meng,JIANG Haomin,et al.FEM and experiment analyses of stamping process for AHSS part[J].Journal of Plasticity Engineer,2010,17(3):66-69.
[8]林俊峰,苑世剑,韩笑峰.材料成形性能对空心曲轴内高压成形模拟结果的影响[J].中国机械工程,2006,(s1):48-50.LIN Junfeng,YUAN Shijian,HAN Xiaofeng.The influence of material's mechanical property on simulation of hollow crankshaft hydroforming[J].China Mechanical Engineering,2006,(s1):48-50.
[9]张成祥,陈明和,雷晓晶,等.GH163合金成形极限图及应用[J].塑性工程学报,2016,23(1):93-98.ZHANG Chengxiang,CHEN Minghe,LEI Xiaojing,et al.Forming limit diagram of superalloy GH163 sheet and application[J].Journal of Plasticity Engineer,2016,23(1):93-98.
[10]HOSFORD W F.Limitation of non-quadratic anisotropic yield criterion and their use in analysis of sheet forming[J].ASM International,1998,8:163-170.
[11]BARLAT F,LIAN J.Plastic behavior and stretchability of sheet metals,Part I:A yield function for orthotropic sheet under plane stress conditions[J].International Journal Plasticity,1989,5(1):51-60.
[12]KEELER S P.Determination of forming limits in automotive stampings[J].Sheet Metal Industries,1965,42:683-691.
[13]MILLER V M,BERMAN T D,BEYERLEIN I J,et al.Prediction of the plastic anisotropy of magnesium alloys with synthetic textures and implications for the effect of texture on formability[J].Materials Science&Engineering A,2016,675:345-360.