Low cycle fatigue prediction for cylinder heads considering stress gradient and local yielding

H. Ashouri
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Abstract

Due to the complex geometry and thermo-mechanical loading, cylinder heads is the most challenging parts among all parts engines. It must endure cyclic thermo-mechanical stresses throughout their lifetime. In this paper, the low cycle fatigue (LCF) life analysis of the cylinder heads considering the stress gradient and local yielding, is performed using the finite element method and ANSYS software to predict the temperature and stresses, and then, LCF life using Morrow theory and nCode Design Life software. Elastic and plastic properties of cylinder heads obtained by LCF tests at different temperatures. The results of finite element analysis (FEA) showed that the maximum temperature and stress values in the cylinder heads are 220.29°C and 89.868 MPa and the position is at the valve bridge between exhaust valves. The numerical results showed that bridge between exhaust valves and valve seats are areas susceptible to fatigue cracks. The LCF life results showed that 1073 cycles is the minimum fatigue life and occurs between exhaust valves. 400-h durability test showed no rupture in different parts of the cylinder heads.
考虑应力梯度和局部屈服的气缸盖低循环疲劳预测
由于复杂的几何形状和热机械负载,气缸盖是发动机所有部件中最具挑战性的部件。它必须在整个使用寿命期间承受循环热机械应力。本文使用有限元法和 ANSYS 软件对气缸盖进行了低循环疲劳(LCF)寿命分析,考虑了应力梯度和局部屈服,预测了温度和应力,然后使用 Morrow 理论和 nCode Design Life 软件进行了低循环疲劳寿命分析。在不同温度下通过 LCF 试验获得气缸盖的弹性和塑性特性。有限元分析(FEA)结果表明,气缸盖的最高温度和应力值分别为 220.29°C 和 89.868 MPa,位置位于排气门之间的气门桥上。数值结果表明,排气门之间的气门桥和气门座是容易出现疲劳裂纹的区域。LCF 寿命结果表明,1073 次循环是最低疲劳寿命,且发生在排气门之间。400 小时耐久性测试表明,气缸盖的不同部位没有破裂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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