柴油机铝合金气缸盖热机耦合疲劳损伤分析  

Thermo-Mechanical Fatigue Damage Analysis of Diesel Engine Aluminum Alloy Cylinder Head

作　　者：张醒[1] 卢耀辉[1] 郑何妍 张德文[1] ZHANG Xing LU Yao-hui ZHENG He-yan ZHANG De-wen(School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China)

机构地区：[1]西南交通大学机械工程学院,成都610031

出　　处：《重庆理工大学学报（自然科学）》2017年第3期82-89,共8页Journal of Chongqing University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(51275428)

摘　　要：针对某型高功率密度柴油机铝合金气缸盖,建立有限元模型,采用Abaqus计算结构温度场及应力场。以热机耦合应力场结果为基础,并考虑温度对材料性能的影响,计算气缸盖热机耦合疲劳损伤。由分析结果可知:在热机耦合加载条件下,气缸盖应力值最大为179MPa,位于气缸盖鼻梁区,考虑温度对铝合金材料强度的弱化影响,该值满足材料静强度要求。疲劳寿命分析结果表明:气缸盖危险区域的最大损伤值(对数值)为-4.54;气缸盖鼻梁区产生裂纹的主要原因是该处热机耦合疲劳载荷引起的应力集中。Based on a certain type of military diesel engine aluminum cylinder head,we established the finite element model and calculated the temperature field and stress in Abaqus. Based on the results of the thermo-mechanical coupling stress field and temperature field and considering the influence of temperature on material properties,thermo-mechanical fatigue damage of cylinder head was calculated. The results show that the maximum stress（ 179 MPa） is located at the nose area of the cylinder head, which meets the requirements of the static strength of materials with the consideration of the influence of temperature on material properties. The fatigue life analysis results show that the maximum damage（ logarithmic） of cylinder head in dangerous areas is-4. 54,which means the main reason of cylinder head crack on the nose region is caused by the stress concentration caused by the thermo-mechanical fatigue load.

关 键 词：气缸盖 温度场 热机耦合 疲劳损伤 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]