基于积分法的轴对称拉深成形凸缘区应力、应变数值解

在平面应力、平面应变和等效应变与位置半径反比假设条件下,对轴对称拉深成形凸缘区的应力、应变的解析解进行比较.在平面应力假设条件下,给出了基于直接积分法的凸缘区应力、应变计算流程,简化了参数方程的求解过程,得到了考虑厚度变化的应力应变数值解.理论分析和有限元模拟结果表明,3 种假设条件下的径向应力数值解与有限元模拟结果都相差较小,平面应力假设条件下的应力、应变数值解与有限元仿真结果更接近.采用0.87mm 厚的ST16钢板进行了圆筒形件拉深成形实验,测量了凸缘区的应变,分析表明,平面应力假设条件下得到的应变数值解与实验结果更相符, 有限元仿真结果与实验结果接近且趋势-致.

Analytical solutions of stress and strain in flange region of axisymmetric parts in deep drawing process based on integration

In the light of a pump camof emission type single cylinder diesel engine, a lasermicro texture on its surface is inspected.The influence of abrasive resistance of the camis explored through the engine durability test and surface abrasion test when the camsurface is applied laser surface texturing and reliability of engine. Meanwhile, the feasibility of using the nodular cast iron insteadof steel as the camshaft materials is discussed. The results show that： after 300 hours＇ durability test with full speed and load, thesurface wear of the cam is only about 2 m, which is made by nodular cast iron and applied laser surface texturing. At the sametime, the hardness and the wear resistance of the area near the surface texturing increased observably, compared to the non-texturingarea. In addition, the power performance, emission performance and economic performance of the engine are still good, the powerloss and other bad conditions do not occur. In addition, it is feasible to use nodular cast iron by laser surface texturing instead ofsteel as the camshaft materials.