双金属复合管液压成型的有限元模拟及残余接触压力计算

摘要

In the process of bimetal composite tube plastic hydraulic forming, it adopted the finite element common software ABAQUS to carry out elastic-plastic analysis on mechanical behavior, established the corresponding relation between different material composite pipe expanding tube pressure and the residual contact pressure. Through finite element simulation, it obtained the smallest forming tube expanding pressure in clearance elimination phase, the elastic limit expansion pressure and contact pressure, the tube expansion pressure and contact pressure of outside pipe when the yield occurred, the limit tube expanding pressure and contact pressure when the fully plastic deformation occurred in outside pipe, and the residual contact pressure after unloading. The results showed when the outside tube material is X65C, the residual contact pressure is 0 after inside and outside pipe unloading; when the outer tube material is L360QS, after unloading the residual contact pressure is 3.495 MPa, and tube expanding pressure 49.78 MPa in the elastic limit and plastic limit expansion pipe pressure is 54.6 MPa, the outer tube will appear plastic deformation. When expanding, it must control the expansion pipe pressure is less than the plastic limit pressure, otherwise, the outer tube will happen plastic flow, it is not allowed.%应用有限元通用软件ABAQUS，对双金属复合管塑性成型过程中的力学行为进行弹塑性分析，建立了不同材料复合管胀管压力与残余接触压力之间的对应关系。通过有限元模拟，得出不同材料在间隙消除阶段的最小成型胀管压力，外管弹性极限胀管压力及接触压力、外管刚发生屈服时的胀管压力和接触压力以及外管完全发生塑性变形的极限胀管压力和接触压力，卸载后的残余接触压力。结果表明，当外管材料为X65C时，内外管卸载后残余接触压力为0，当外管材料为L360QS时，卸载后内外管残余接触压力为3.495 MPa，并且胀管压力处于弹性极限胀管压力49.78 MPa和塑性极限胀管压力54.6 MPa时，外管将出现塑性变形，在胀接时，必须控制胀管压力小于塑性极限胀管压力，否则，外管将出现塑性流动，这是不允许的。