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筒形件反旋工艺塑性流动刚塑性有限元分析 总被引:1,自引:0,他引:1
建立了筒形件反旋工艺平面变形刚塑性有限元分析的力学模型,比较了把反旋工艺视为正挤和本文力学模型条件下的速度场,有限元分析结果与反旋实际条件相符。 相似文献
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The application of a combined finite-discrete element modeling approach to simulate the three-dimensional microscopic compaction behavior of single-layer metal powder system was described. The process was treated as a static problem, with kinematical component being neglected. Due to ill condition, Cholesky‘s method failed to solve the system equations, while conjugate gradient method was tried and yielded good results. Deformation of the particles was examined and compared with the results of physical modeling experiments. In both cases, the inner particles were deformed from sphere to polygonal column, with the edges turning from arc to straight line. The edge number of a particle was equal to the number of particles surrounding it. And the experiments show that the ductile metal particles can be densified only by their plastic deformation without the occurrence of rearrangement phenomenon. 相似文献
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正向充液变薄拉深工艺的研究 总被引:2,自引:0,他引:2
提出了一种称为正向充液变薄拉深的工艺方法。从理论上推导出变薄成形传力区拉应力计算式,并采用软铝车削毛坯进行了正向充液变薄拉深试验。当液压达到了120MPa时,车削铝毛坯的极限变薄拉深系数由0.5减小到0.3,说明正向充液变薄拉深工艺能有效地提高一次变薄拉深成形极限。 相似文献
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筒形件错距旋压工艺的试验研究 总被引:5,自引:0,他引:5
影响错距旋压零件精度的因素很多,本文通过在St56-90CNC进行薄壁长筒形件试验研究,分析了反旋进给率增大产生缩径的原因,进给率变化对壁厚的影响规律,以及毛坯外端对成形区的约束作用。通过改变进给率成功地控制零件的壁厚和扩径,保证了加工零件的精度。 相似文献
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复合材料具有其独特的性能优势。利用304不锈钢纤维和191不饱和聚酯树脂(UPR)进行真空无压浸渗并加热固化制成不同纤维含量的复合材料,分别测试其单向拉伸、压缩和冲击力学性能并分析破坏机制。实验表明,复合材料力学性能总体上随不锈钢纤维体积含量上升而增强,而随着骨架结构趋于饱和抗拉强度上升有其极限。单向拉伸曲线并没有明显的屈服阶段,但是准静态压缩曲线屈服阶段明显。失效是多种机制共同作用的结果,破坏断面在宏观上表现为脆断模式,但其SEM显示在微观层面上表现为韧性断裂。不锈钢纤维骨架结构韧性强,能够有效阻止裂纹在材料中的传播而起到增强作用。 相似文献
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