Open Access
ARTICLE
Fatigue Life Evaluation Method for Foundry Crane Metal Structure Considering Load Dynamic Response and Crack Closure Effect
Qing Dong1, *, Bin He1, Gening Xu1
1 School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan, China.
* Corresponding Author: Qing Dong. Email: .
Computer Modeling in Engineering & Sciences 2020, 122(2), 525-553. https://doi.org/ 10.32604/cmes.2020.08498
Received 31 August 2019; Accepted 19 November 2019; Issue published 01 February 2020
Abstract
To compensate for the shortcomings of quasi-static law in anti-fatigue analysis
of foundry crane metal structures, the fatigue life evaluation method of foundry crane
metal structure considering load dynamic response and crack closure effect is proposed.
In line with the theory of mechanical vibration, a dynamic model of crane structure
during the working cycle is constructed, and dynamic coefficients under diverse actions
are analysed. Calculation models of the internal force dynamic change process of
dangerous cross-sections and a simulation model of first principal stress-time history are
established by using the steel structure design criteria, which is utilised to extract the
change of first principal stress of danger points over time. Then, the double-parameter
stress spectrum is obtained by the rain flow counting method. The fatigue life calculation
formula is corrected by introducing a crack closure parameter that can be calculated by
the stress ratio and the effective stress ratio. Under the finite element model imported into
Msc. Patran, crack propagation analysis is performed by the growth method in the fatigue
integration module Msc. Fatigue. Taking the metal structure of a 100/40t-28.5m foundry
crane with track offset as an example, the accuracy of calculation results and the
feasibility and applicability of the proposed method are verified by theoretical calculation
and finite element simulation, which provide a theoretical basis for improvement of the
fatigue resistance design of foundry cranes.
Keywords
Cite This Article
Dong, Q., He, B., Xu, G. (2020). Fatigue Life Evaluation Method for Foundry Crane Metal Structure Considering Load Dynamic Response and Crack Closure Effect.
CMES-Computer Modeling in Engineering & Sciences, 122(2), 525–553.