Title: Study on fatigue reliability evaluation method of mechanical system with damage structure under variable amplitude load
Authors: Yuanyuan Ma; Liyang Xie; Xiaohang Xiong
Addresses: School of Mechanical Engineering and Automation, Liaoning University of Technology, Jinzhou 121001, China ' School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China ' School of Mechanical Engineering and Automation, Liaoning University of Technology, Jinzhou 121001, China
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.
Keywords: variable amplitude loading; damage structure; probabilistic fatigue; structural reliability; system failure modelling.
International Journal of Computational Materials Science and Surface Engineering, 2018 Vol.7 No.2, pp.150 - 165
Received: 10 Aug 2017
Accepted: 16 Jan 2018
Published online: 24 Jun 2018 *