材料力学性能对管材数控绕弯成形时壁厚变化的影响

摘要

基于ABAQUS/Explicit有限元平台,建立了规格为?15.88 mm×0.84 mm的21-6-9高强不锈钢管数控绕弯成形三维弹塑性有限元模型并验证了模型的可靠性;然后采用该模型通过有限元模拟研究了不锈钢力学性能变化对管材数控绕弯成形时壁厚变化率的影响.结果表明:弯管的壁厚变化率随着不锈钢强度系数、硬化指数的增大或屈服强度的降低而减小,弹性模量和泊松比对壁厚变化率基本没有影响;壁厚变化率对力学性能的敏感性由大到小依次为强度系数、硬化指数、屈服强度、弹性模量、泊松比.%Based on the platform of ABAQUS/Explicit,a three-dimensional elastic-plastic finite element model of the numerical control (NC)rotary draw bending of 21-6-9 high strength stainless steel tube with the specification of?15.88 mm×0.84 mm was established,and the reliability of the model was validated.Then the effects of mechanical properties of the stainless steel on the wall thickness variation rates during the NC rotary draw bending were investigated by finite element simulation with the established model.The results show that the wall thickness variation rate of the bend tube decreased with the increase of strength coefficient and hardening exponent or with the decrease of yield strength of the stainless steel,while elastic module and Poisson′s ratio had little influences on the wall thickness variation rates.The sensitivity of the wall thickness variation rate to material mechanical properties was from high to low in the order of strength coefficient,hardening exponent,yield strength, elastic module and Poisson′s ratio.