Experimental study on mechanical properties of Q690 high strength steel after fatigue damage

被引：0
|
作者：
Zhang C. [1 ,2 ]
Zhu H. [2 ]
Wang R. [1 ,2 ]
机构：
[1] Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Southwest University of Science and Technology-China Academy of Engineering Physics ISE, Mianyang
[2] School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2021年 / 42卷 / 04期
关键词：
Fatigue damage; Fitting formula; Mechanical property; Q690 high strength steel; Tensile test;
D O I：
10.14006/j.jzjgxb.2019.0556
中图分类号：
学科分类号：
摘要：
The residual mechanical performance of in-service structure after fatigue damage is regarded as a crucial indicator for structural reliability assessment. The residual strength of Q690 high strength steel subjected to different levels of fatigue damage was investigated. According to the fatigue life of Q690 high strength steel, three fatigue loads and nine life fractions were first determined. Fatigue damage was induced by subjecting the specimens to these nine different life fractions under three fatigue loads. And then subsequent tensile tests were conducted on these damaged specimens to obtain their stress-strain curves and associated mechanical properties (yield strength, ultimate strength, Young's modulus and ultimate elongation). Significant differences are observed in the position and the morphological features of Q690 high strength steel after different fatigue damages. In addition, there is no yield plateau in the stress-strain curves of Q690 high strength steel under static tension after fatigue damages. Meanwhile, the stress-strain curves exhibit many wrinkles which are attributed to the phenomenon of strain invariance and stress reduction. Furthermore, significant reductions in the yield strength, ultimate strength and ultimate elongation are observed due to the effect of fatigue damage. In contrast, the influence of fatigue damage on Young's modulus is negligible. Based on the test data, a new set of predictive equations are proposed to determine the mechanical properties of Q690 steel with different fatigue damages, which can effectively evaluate the mechanical properties of Q690 high strength steel after fatigue damage. © 2021, Editorial Office of Journal of Building Structures. All right reserved.
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页码：177 / 184
页数：7
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