Assessment of Fatigue Strength of Structural Elements with Surface Defects Arising due to Mechanical Damage

IF 0.4 Q4 ENGINEERING, MECHANICAL

Journal of Machinery Manufacture and Reliability Pub Date : 2025-07-30 DOI:10.1134/S1052618825700232

V. G. Sofich, I. A. Razumovskii

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Abstract

The results of development of the methodology and program for numerical modeling of the process of fatigue failure of structural elements with surface mechanical damage (defects) such as guide scratches and marks are presented. The calculation includes two stages: Stage 1 includes modeling the process of defect formation as a dynamic elastic-plastic contact problem; Stage 2 includes fatigue calculation taking into account the influence of defects and residual stress fields arising during its creation. For a number of model examples, the distributions of residual stresses in defect zones and the dependences of the maximum residual stress on the cross sectional shape of damaging elements (of various configurations (rectangular, semielliptical, wedge-shaped) and their movement speeds are obtained, and the values of the minimum movement speeds of damaging elements at which the damage of the considered type is possible for a given cross-sectional configuration are established. The results of calculations of samples made of 17G1S pipe steel with defects for resistance to fatigue failure are presented.

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机械损伤引起表面缺陷的构件疲劳强度评估

介绍了具有表面机械损伤（缺陷）（如导向划痕和标记）的结构构件疲劳破坏过程数值模拟方法和程序的开发结果。计算包括两个阶段：第一阶段将缺陷形成过程建模为动态弹塑性接触问题；阶段2包括疲劳计算，考虑了缺陷的影响和在其形成过程中产生的残余应力场。通过若干模型算例，得到了缺陷区残余应力的分布以及最大残余应力与损伤单元(各种构型（矩形、半椭圆形、楔形）的截面形状及其运动速度的关系，并建立了在给定截面构型下损伤单元可能发生损伤的最小运动速度值。给出了含缺陷的17G1S管钢试样抗疲劳破坏性能的计算结果。

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

Journal of Machinery Manufacture and Reliability ENGINEERING, MECHANICAL-

CiteScore

0.80

自引率

33.30%

发文量

期刊介绍： Journal of Machinery Manufacture and Reliability is devoted to advances in machine design; CAD/CAM; experimental mechanics of machines, machine life expectancy, and reliability studies; machine dynamics and kinematics; vibration, acoustics, and stress/strain; wear resistance engineering; real-time machine operation diagnostics; robotic systems; new materials and manufacturing processes, and other topics.