Study on fatigue reliability evaluation method of mechanical system with damage structure under variable amplitude load

Q3 Engineering

International Journal of Computational Materials Science and Surface Engineering Pub Date : 2018-06-25 DOI:10.1504/IJCMSSE.2018.10013802

Y. Ma, Liyang Xie, X. Xiong

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引用次数: 0

Abstract

The parts of large-scale machinery equipment are mostly welded with each other. Welded structures with internal defects can be regarded as damage structures, which is much easier to suffer from fatigue damage under the action of variable amplitude loads. In this paper, the scale welding structure system - hydraulic support is taken as the object of study. Firstly, combining with the characteristics of its workload, it adopts a new angle: The probabilistic characteristics of the load history of hydraulic support are described and the reliability evaluation of the structure is carried out from 'macro' and 'micro'. Secondly, the equivalent cyclic loading with equivalent stress amplitude is equivalent to the equivalent cyclic loading by applying the damage equivalent mechanism. Based on this, the calculation of the total probability and the statistical average algorithm, the fatigue reliability model was built. It can objectively reflect the real failure, the correlation between the sites of injury.

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具有损伤结构的机械系统在变幅载荷作用下的疲劳可靠性评估方法研究

大型机械设备的零件大多是焊接在一起的。具有内部缺陷的焊接结构可视为损伤结构，在变幅载荷作用下更容易发生疲劳损伤。本文以大型焊接结构系统——液压支架为研究对象。首先，结合其工作量的特点，采用了一个新的角度：描述了液压支架荷载历史的概率特征，并从“宏观”和“微观”两个方面对结构进行了可靠性评估。其次，采用损伤等效机制，将等效应力幅值的等效循环载荷等效为等效循环载荷。在此基础上，通过总概率的计算和统计平均算法，建立了疲劳可靠性模型。它能客观地反映出真正的失败，损伤部位之间的相关性。

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

International Journal of Computational Materials Science and Surface Engineering Engineering-Engineering (all)

CiteScore

1.20

自引率

0.00%

发文量

期刊介绍： IJCMSSE is a refereed international journal that aims to provide a blend of theoretical and applied study of computational materials science and surface engineering. The scope of IJCMSSE original scientific papers that describe computer methods of modelling, simulation, and prediction for designing materials and structures at all length scales. The Editors-in-Chief of IJCMSSE encourage the submission of fundamental and interdisciplinary contributions on materials science and engineering, surface engineering and computational methods of modelling, simulation, and prediction. Papers published in IJCMSSE involve the solution of current problems, in which it is necessary to apply computational materials science and surface engineering methods for solving relevant engineering problems.