利用应力寿命预测模型对桥梁平板构件的摩擦疲劳进行实验和数值研究

IF 3.1 2区 材料科学 Q2 ENGINEERING, MECHANICAL Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2024-07-04 DOI:10.1111/ffe.14384
Xiyuan Zhang, Dasheng Wei, Shun Yang
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引用次数: 0

摘要

该研究利用在循环载荷下测试的带有两个桥式垫的扁平试样,对桥式扁平部件的摩擦疲劳行为进行了研究。研究还使用有限元法进行了数值模拟。首先,利用材料的弹塑性模型对接触应力进行了精确计算。其次,提取了最大应力截面上的应力分布,并计算了应力梯度。最后,提出了考虑应力梯度的应力疲劳寿命预测模型,并将预测寿命与试验寿命进行了比较。研究结果表明,在桥平试验中,试样在接触区边缘表现出较高的应力梯度。与平滑疲劳相比,摩擦疲劳寿命明显缩短。本文提出的寿命预测模型在预测摩擦疲劳方面具有良好的准确性。
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Experimental and numerical investigations on fretting fatigue in a bridge-flat component using a stress life prediction model

The study investigated the fretting fatigue behavior of a bridge-flat component, utilizing a flat specimen with two bridge-type pads tested under cyclic loading. Numerical simulations were also carried out using the finite element method. Firstly, precise calculations of contact stress were performed with the material's elastoplastic model. Secondly, the stress distribution on the maximum stress cross-section was extracted, and the stress gradient was computed. Finally, a stress fatigue life prediction model considering the stress gradient was proposed, and the predicted life was compared with the test life. The results of the study revealed that the specimens exhibited high stress gradients at the edges of the contact region during the bridge-flat tests. In comparison with plain fatigue, fretting fatigue life was significantly reduced. The life prediction model proposed in this paper demonstrated good accuracy for predicting fretting fatigue.

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来源期刊
CiteScore
6.30
自引率
18.90%
发文量
256
审稿时长
4 months
期刊介绍: Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.
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