中文摘要：

活塞是柴油机的重要运动件。它所处的工作环境复杂,因此有必要将其结构进行强化。通过ANSYS软件,模拟高温环境以及最高爆发压力时的变形状况。模拟结果表明,在机械载荷作用下活塞销孔内侧上部出现最大应力,销座孔底部变形最为严重。在热负荷的影响下应力最大发生在内侧顶部位置,变形最大量发生在顶部边缘位置。而热机载荷耦合时等效应力最大发生在销座孔内部上侧以及顶面下方,变形最严重发生在裙部边缘。热机耦合作用对活塞的影响大于两者对活塞影响的简单相加。在活塞校核时需要进一步改善应力分布。

英文摘要：

The piston is an important moving part of diesel engine. Because of its complex working environment, it is necessary to strengthen the structure of the piston. In this paper, the deformation in the hot temperature environment and under themaximum explosion pressure is simulated by using the ANSYS software. The simulation results show that： the maximum stressoccurs in the upper inside piston pin hole under the action of mechanical load and the maximum deformation appears at thebottom of the pin hole; the maximum stress appears in the inside of the top piston under the action of the thermal load and themaximum deformation appears on the edge of the piston at the top position; the maximum stress occurs in upper inside pistonpin hole and the top edge of the piston under the coupling of the thermal and mechanical load, the biggest deformation appearson the edge of the piston skirt. So influence of the thermal-mechanical coupling on the piston is greater than the simple addition of the impact; thus the stress distribution needs to be further improved in the piston checking process.