摘要
为了研究板材拉深中的成形极限,对金属材料的拉深成形进行塑性及变形分析。以横观各向同性材料为研究对象,采用对实验数据拟合能力较好的Hosford屈服函数,对拉深成形过程中法兰区的变形性能进行分析,得到法兰区应力场;采用数值积分拟合的方法,给出拉深冲杯杯高数值积分拟合表达式,并用η=2时的杯高解析表达式对此拟合方法的可靠性进行验证;利用Zwick万能试验机和拉深试验机,对铝板进行了拉伸和冲杯实验,验证了杯高表达式的正确性;利用杯高数值积分拟合表达式计算杯高,η=8的结果相对η=2的结果更接近实测杯高,说明了Hosford屈服函数比Hill48屈服函数对金属材料的塑性变形拟合效果更好。
The plasticity and deformation of metal material in deep drawing were analyzed to study the forming limit of sheet metal in deep drawing. The transverse isotropic material was taken as the research object,the Hosford yield function which has good fitting ability to the experimental data was used to analyze the deformation performance of the flange region in deep drawing process,and the stress field in flange region was obtained. Using numerical integral fitting method,the numerical integral fitting function of cup height in deep drawing cup process was given,and the reliability of the fitting method was verified by the analytical solution of cup height when η = 2. The correctness of the expression of cup height was verified by tension and cupping tests of aluminum sheet using Zwick universal testing machine and deep drawing testing machine. The cup height was calculated by numerical integral fitting function. The result of η = 8 is closer to the measured cup height than the result of η = 2,indicating that the Hosford yield function is better than the Hill48 yield function in fitting the plasticity of metal materials.
作者
何盼盼
黄模佳
吴萍
苗玉洁
HE Pan-pan;HUANG Mo-jia;WU Ping;MIAO Yu-jie(School of Civil Engineering and Architecture,Nanchang University,Nanchang 330031,China;School of Civil Engineering and Architecture Engineering,East China University of Technology,Nanchang 330013,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2020年第2期102-107,共6页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(11572147,51568046)
东华理工大学校级创新项目(DHYC-201930)。
