Fatigue in engine connecting rod bolt due to forming laps

被引：29

作者：

Griza, S. ^{[1
]}

Bertoni, F. ^{[1
]}

Zanon, G. ^{[1
]}

Reguly, A. ^{[1
]}

Strohaecker, T. R. ^{[1
]}

机构：

[1] Univ Fed Rio Grande do Sul, Dept Met, BR-90035190 Porto Alegre, RS, Brazil

来源：

ENGINEERING FAILURE ANALYSIS | 2009年 / 16卷 / 05期

关键词：

Connecting rod bolt; Fatigue; Failure analysis; Design; Forming laps; FAILURE ANALYSIS;

D O I：

10.1016/j.engfailanal.2008.10.002

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

An analysis was performed to asses the failure root cause of an automotive diesel engine which experienced collapse only 6 month after revision. The connecting rod bolts torque disassembly was monitored and fractured parts were selected to laboratory fracture analysis. It was verified with fatigue rupture of one of the fourth connecting rod bolt. Tensile tests were performed in four of the remaining connecting rod bolts. During this procedure, it was verified another bolt with fatigue crack propagation an indication that the first fatigued bolt did not have suffer torque relaxation. A finite element analysis was performed in connection with an analytical fracture mechanics approach aiming to evaluate the relation between tightening force and fatigue crack propagation in connecting rod bolts. The engine collapse occurred due to forming laps in the grooves of the bolt shank. Finally, some design improvements were suggested for avoid future failures: a gap in the groove length at the connecting rod cap interface, enough to avoid combination of forming laps and higher stress amplitude; increase of the bolt torque assembly to reduce stress amplitude. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1542 / 1548

页数：7

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