Cyclic Deformation Behavior and Fatigue Crack Propagation of Low Carbon Steel Prestrained in Tension

4区材料科学 Q2 Engineering

Advances in Materials Science and Engineering Pub Date : 2009-07-19 DOI:10.1155/2009/657284

J. G. Wang, W. Jia, D. Ju

引用次数: 1

Abstract

The tests were performed on low carbon steel plate. In the tension fatigue tests, two angle values (𝜙=0∘ and 𝜙=45∘, 𝜙 is the angle between the loading and the rolling direction) have been chosen. The influence of strain path change on the subsequent initial work softening rate and the saturation stress has been investigated. Dislocation microstructure was observed by transmission electron microscopy. It was found that the strain amount of preloading in tension has obviously affected the cyclic softening phenomenon and the initial cyclic softening rate. It was observed that the reloading axial stress for 𝜙=45∘ case increased more than that of 𝜙=0∘ case, due to the anisotropism of Q235. In the fatigue crack propagation tests, the experimental results show that with increasing the pretension deformation degree, the fatigue crack growth rate increases, especially at the near threshold section.

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低碳钢拉伸预拉循环变形行为及疲劳裂纹扩展

试验在低碳钢板上进行。在拉伸疲劳试验中，选择了两个角度值(=0°和=45°，是载荷与滚动方向之间的夹角)。研究了应变路径变化对后续初始工作软化速率和饱和应力的影响。透射电镜观察了位错微观结构。结果表明，拉伸预压应变量对循环软化现象和初始循环软化速率有明显影响。我们观察到，由于Q235的各向异性，在 =45°的情况下，轴向重加载应力比在 =0°的情况下增加得多。在疲劳裂纹扩展试验中，实验结果表明，随着预拉伸变形程度的增加，疲劳裂纹扩展速率增大，特别是在近阈值段。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advances in Materials Science and Engineering Materials Science-General Materials Science

CiteScore

3.30

自引率

0.00%

发文量

审稿时长

4-8 weeks

期刊介绍： Advances in Materials Science and Engineering is a broad scope journal that publishes articles in all areas of materials science and engineering including, but not limited to: -Chemistry and fundamental properties of matter -Material synthesis, fabrication, manufacture, and processing -Magnetic, electrical, thermal, and optical properties of materials -Strength, durability, and mechanical behaviour of materials -Consideration of materials in structural design, modelling, and engineering -Green and renewable materials, and consideration of materials’ life cycles -Materials in specialist applications (such as medicine, energy, aerospace, and nanotechnology)