SIMULATION AND ANALYSIS OF CRACKING EXHAUST PIPE FOR SINGLE-CYLINDER DIESEL ENGINE

ZHANG HuaBing; LI LiTing; MIAO WeiChi; JIAO YaFei; LIANG Gang; QIAO XinQi

doi:10.16579/j.issn.1001.9669.2019.02.028

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SIMULATION AND ANALYSIS OF CRACKING EXHAUST PIPE FOR SINGLE-CYLINDER DIESEL ENGINE

更新时间：2022-09-22

- SIMULATION AND ANALYSIS OF CRACKING EXHAUST PIPE FOR SINGLE-CYLINDER DIESEL ENGINE
- Journal of Mechanical Strength Vol. 41, Issue 2, Pages: 430-435(2019)
- 作者机构：
  
  1. 上海交通大学机械与动力工程学院
  2. 上海船用柴油机研究所研发中心
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2019.02.028
  CLC：
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ZHANG HuaBing, LI LiTing, MIAO WeiChi, et al. SIMULATION AND ANALYSIS OF CRACKING EXHAUST PIPE FOR SINGLE-CYLINDER DIESEL ENGINE. [J]. 41(2):430-435(2019)
DOI：

ZHANG HuaBing, LI LiTing, MIAO WeiChi, et al. SIMULATION AND ANALYSIS OF CRACKING EXHAUST PIPE FOR SINGLE-CYLINDER DIESEL ENGINE. [J]. 41(2):430-435(2019) DOI： 10.16579/j.issn.1001.9669.2019.02.028.

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。

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.

关键词

柴油机排气管疲劳分析热模态热机耦合

Keywords

Diesel engineExhaust pipeFatigue analysisThermal modeThermo-mechanical coupling

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