基于SPH法的AZ31镁合金BP-ECAP过程三维数值模拟  

3D Numerical Simulation of AZ31 Magnesium Alloy during BP-ECAP Process Based on SPH

作　　者：宋婷婷 薄延强 牛晓峰[1] 邱云基 申梦清 Song Tingting;Bo Yanqiang;Niu Xiaofeng;Qiu Yunji;Shen Mengqing(School of Materials Science and Engineering\Taiyuan University of Technology)

机构地区：[1]太原理工大学材料科学与工程学院,太原030024

出　　处：《特种铸造及有色合金》2021年第2期219-222,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51874209);山西省科技重大专项基金资助项目(20191102007)。

摘　　要：光滑粒子流体动力学方法(Smooth Particle Hydrodynamics,SPH)在求解大变形问题方面具有优势。基于SPH法编写程序对AZ31镁合金的BP-ECAP过程进行三维数值模拟,并与相关研究文献进行对比,验证了编写的SPH法背压程序的正确性。对不同工艺参数下AZ31镁合金的背压-等通道挤压过程进行模拟,并从等效塑性应变及损伤值分布角度进行分析。模拟结果表明,选择恰当的背压值能有效地阻止镁合金变形过程中裂纹的萌生及扩展。Smooth Particle Hydrodynamics(SPH)is a meshless particle method,which has advantages in solving large deformation problems.A three-dimensional numerical simulation of AZ31 magnesium alloy during BPECAP process was carried out based on the SPH method.The simulated results were consistent with those in the literature,which verified the correctness of the SPH method back pressure program.The back pressure-equal channel extrusion process of AZ31 magnesium alloy under different process parameters were predictively simulated and analyzed from the perspective of equivalent plastic strain and damage value distribution.The simulated results reveal that the appropriate back pressure value can prevent effectively the initiation and propagation of cracks during the deformation of magnesium alloys.

关 键 词：光滑粒子动力学 AZ31镁合金 背压-等通道挤压工艺 3D数值模拟 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TP311[金属学及工艺—金属材料]