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单缸柴油机排气管疲劳开裂的仿真分析
引用本文:张华兵,李丽婷,苗伟驰,焦亚飞,梁刚,乔信起. 单缸柴油机排气管疲劳开裂的仿真分析[J]. 机械强度, 2019, 41(2): 430-435
作者姓名:张华兵  李丽婷  苗伟驰  焦亚飞  梁刚  乔信起
作者单位:上海交通大学机械与动力工程学院,上海200240;上海船用柴油机研究所研发中心,上海201108;上海船用柴油机研究所研发中心,上海,201108;上海交通大学机械与动力工程学院,上海,200240
摘    要:针对单缸柴油机排气管的开裂问题,提出了基于等效振动和材料温度效应的热机耦合方法,利用有限元法计算排气管的温度和应力,并依据修正的Miner法则和线性累计损伤理论,考虑应力梯度、表面粗糙度和温度的影响,预测排气管结构的疲劳危险位置。结果表明:排气管失效的原因是由于上下方向刚度不足,存在热模态共振风险,疲劳安全系数不足导致开裂;原失效和增加支撑的排气管疲劳安全系数分别为1.06和1.6,仿真预测结果与实际符合一致。

关 键 词:柴油机  排气管  疲劳分析  热模态  热机耦合

SIMULATION AND ANALYSIS OF CRACKING EXHAUST PIPE FOR SINGLE-CYLINDER DIESEL ENGINE
ZHANG HuaBing,LI LiTing,MIAO WeiChi,JIAO YaFei,LIANG Gang,QIAO XinQi. SIMULATION AND ANALYSIS OF CRACKING EXHAUST PIPE FOR SINGLE-CYLINDER DIESEL ENGINE[J]. Journal of Mechanical Strength, 2019, 41(2): 430-435
Authors:ZHANG HuaBing  LI LiTing  MIAO WeiChi  JIAO YaFei  LIANG Gang  QIAO XinQi
Affiliation:(School of Mechanical Engineering,Shanghai Jiaotong University,Shanghai 200240,China;R&D Center,Shanghai Marine Diesel Engine Research Institute,Shanghai 201108,China)
Abstract:Aiming at exhaust pipe cracking failure of a single cylinder diesel engine, thermo-mechanical coupling approach based on equivalent vibration and material temperature effect was presented, and then varied stress was simulated using Finite Element Method. According to the modified Miner law and linear cumulative damage theory, considering stress gradient, surface roughness and temperature, dangerous position of exhaust pipe structure is predicted. The results show that exhaust pipe cracking is due to lack of stiffness in upper and lower direction. There is a risk of thermal modal resonance, and insufficient safety factor causes failure. Fatigue safety factor of original and support improved is 1.06 and 1.6, respectively. The predicted results agree well with measurements.
Keywords:Diesel engine  Exhaust pipe  Fatigue analysis  Thermal mode  Thermo-mechanical coupling
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