Scholarlink

<p>The crankshaft is subjected to cyclic, bending and torsion loads. When these loads act on the shaft, fatigue failure occurs after a certain number of cycles. As a result of the loads on the shaft, microcracks occur on the material surface. This situation causes the onset of fatigue failure. The aim of this study is to investigate, through numerical models and experimental tests, the effects on the stress and consequent fatigue behavior of a diesel engine crankshaft under different loads. A single-cylinder diesel engine was operated for 200&#xa0;h at different loads and at a speed of 2000&#xa0;rpm where maximum torque was obtained. As a result of this operation, the crankshaft was broken. Macro- and microstructures of the broken shaft were analyzed. At the same time, stress and fatigue analysis of the shaft was performed using Ansys software. To be used in the numerical study, equations were derived and calculated for the force (42,132&#xa0;N) on the crankshaft at the maximum torque of the engine. Considering the results obtained, fracture occurred in the region of high stress concentration and was confirmed by numerical study. The presence of ratchet and fatigue beach marks in the fracture zone indicates that cyclic loading is critical in the crack initiation and propagation process. SEM analysis showed that both ductile and brittle fracture mechanisms coexist. Fatigue cracking occurred as a result of intense stress concentration due to cyclic differences, irregular radial forces and different load conditions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Microstructural and Numerical Failure Analysis of a Light-Duty Di Diesel Engine Crankshaft

  • 期刊论文

  • 发表日期：

    2026年1月14日

查看全文
  • Mustafa Guven Gok,
  • Ilker Temizer,
  • Omer Cihan

摘要

The crankshaft is subjected to cyclic, bending and torsion loads. When these loads act on the shaft, fatigue failure occurs after a certain number of cycles. As a result of the loads on the shaft, microcracks occur on the material surface. This situation causes the onset of fatigue failure. The aim of this study is to investigate, through numerical models and experimental tests, the effects on the stress and consequent fatigue behavior of a diesel engine crankshaft under different loads. A single-cylinder diesel engine was operated for 200 h at different loads and at a speed of 2000 rpm where maximum torque was obtained. As a result of this operation, the crankshaft was broken. Macro- and microstructures of the broken shaft were analyzed. At the same time, stress and fatigue analysis of the shaft was performed using Ansys software. To be used in the numerical study, equations were derived and calculated for the force (42,132 N) on the crankshaft at the maximum torque of the engine. Considering the results obtained, fracture occurred in the region of high stress concentration and was confirmed by numerical study. The presence of ratchet and fatigue beach marks in the fracture zone indicates that cyclic loading is critical in the crack initiation and propagation process. SEM analysis showed that both ductile and brittle fracture mechanisms coexist. Fatigue cracking occurred as a result of intense stress concentration due to cyclic differences, irregular radial forces and different load conditions.