Finite-element method for the analysis of surface stress concentration factor and relative stress gradient for machined surfaces

IF 1 4区工程技术 Q4 ENGINEERING, MECHANICAL

Mechanical Sciences Pub Date : 2023-10-20 DOI:10.5194/ms-14-451-2023

Guangtao Xu, Zeyuan Qiao, Shaokang Wu, Tianyi Liu, Minghao Zhao, Gang Wang

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引用次数: 0

Abstract

Abstract. Surface topography is an important parameter for evaluating the quality of surface machining, and the stress concentrations produced at notches can have a profound effect on the fatigue life of notched components. The stress concentration factor (SCF, Kt) and relative stress gradient (RSG, χ) are important parameters used to quantitatively characterize stress concentration. In this study, a finite-element (FE) method was used to evaluate the surface SCF and RSG and determine the effect of microscopic surface topography on machined surfaces. An FE simulation of the static tension test of V-notched round-bar specimens was performed, and the stress due to the local surface topography was investigated. The FE method was used to analyze the stress concentration of round-bar specimens with Kt=1, and the reliability of the results was verified using a perturbation method. The FE method was used to calculate the surface SCF and RSG with high accuracy. The surface SCF and RSG values increased with the surface roughness, and the local maximum values of the surface SCF and RSG were at the bottom of the local topography. Therefore, the SCF and RSG could be estimated based on a linear relationship involving average roughness.

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机械加工表面应力集中系数和相对应力梯度的有限元分析方法

摘要表面形貌是评价表面加工质量的重要参数，缺口处产生的应力集中对缺口件的疲劳寿命有深远的影响。应力集中系数(SCF, Kt)和相对应力梯度(RSG， χ)是定量表征应力集中的重要参数。在本研究中，采用有限元(FE)方法评估表面SCF和RSG，并确定微观表面形貌对加工表面的影响。对v形缺口圆杆试件进行了静态拉伸试验有限元模拟，研究了局部表面形貌引起的应力。采用有限元法对Kt=1的圆杆试件的应力集中进行了分析，并用摄动法验证了结果的可靠性。采用有限元法计算表面SCF和RSG，精度较高。地表SCF和RSG值随地表粗糙度的增大而增大，且局部最大值出现在地形底部。因此，SCF和RSG可以基于涉及平均粗糙度的线性关系来估计。

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来源期刊

Mechanical Sciences ENGINEERING, MECHANICAL-

CiteScore

2.20

自引率

7.10%

发文量

审稿时长

29 weeks

期刊介绍： The journal Mechanical Sciences (MS) is an international forum for the dissemination of original contributions in the field of theoretical and applied mechanics. Its main ambition is to provide a platform for young researchers to build up a portfolio of high-quality peer-reviewed journal articles. To this end we employ an open-access publication model with moderate page charges, aiming for fast publication and great citation opportunities. A large board of reputable editors makes this possible. The journal will also publish special issues dealing with the current state of the art and future research directions in mechanical sciences. While in-depth research articles are preferred, review articles and short communications will also be considered. We intend and believe to provide a means of publication which complements established journals in the field.