杆-杆型复合挤压过程模拟及其内部开裂缺陷的预测  

NUMERICAL SIMULATION AND INTERNAL CRACKING PREDICTION OF ROD-ROD AXISYMMETRIC COMBINED EXTRUSION

作　　者：范建文[1] 吴诗[1] 李淼泉[1] 

机构地区：[1]西北工业大学

出　　处：《兵器材料科学与工程》1998年第4期32-36,共5页Ordnance Material Science and Engineering

摘　　要：采用刚塑性有限元法对杆－杆型复合挤压过程进行了数值模拟。在此基础上，对成形过程中的变形力进行了分析，并根据成形过程中的应力、应变场的变化，采用质点跟踪技术，运用韧性断裂准则，对金属变形时产生的内部开裂缺陷进行预测。实验结果表明，数值计算结果与实验结果较为吻合。此项研究对于实际生产中制订工艺及设计模具、提高产品质量方面具有指导性意义。In this paper, the rigid-plastic finite element method is applied to simulate the rod-rod combined extrusion. On the basis of simulation, first, the relationship of the load with the stroke is analyzed. Secondly, combining with the method of tracking the movement of the particles in the materials and the ductile fracture criteria, the internal cracking appearing during the deformation are predicted. The numerial computed results agree well with the experimental results. The achievement in this research may be used to guide process design and tool design for the rod-rod combined extrusion to control the quality of the products.

关 键 词：复合挤压 数值模拟 内部开裂 韧性断裂准则 

分 类 号：TG376.3[金属学及工艺—金属压力加工]