Numerical Analysis of Ratcheting Under Bending- Membrane Loading Conditions

Sajib Kumar Nath; Md. Makfidunnabi; Md Abdullah Al Bari

doi:10.38032/jea.2020.01.003

Authors

Sajib Kumar Nath Department of Mechanical Engineering, Khulna University of Engineering & Technology, Khulna 9203, Bangladesh
Md. Makfidunnabi Department of Mechanical Engineering, Khulna University of Engineering & Technology, Khulna 9203, Bangladesh
Md Abdullah Al Bari Department of Mechanical Engineering, Khulna University of Engineering & Technology, Khulna 9203, Bangladesh

DOI:

https://doi.org/10.38032/jea.2020.01.003

Keywords:

Ratcheting, FEA, Membrane Loading, Bending Loading, Frequency Effect

Abstract

Ratcheting is a vital failure mode when dynamic loading is present in the scenario and it can lead to fatigue or incremental collapse if not restricted. The purpose of this study is to propose a ratchet diagram for primary bending and secondary membrane loading conditions. For this, a finite element analysis model of a rectangular beam is prepared and solved by the numerical analysis software ‘ABAQUS’. The FEA model is validated by carried out a dynamic nonlinear elastic-plastic analysis with the analytical solution of Yamashita et al. for similar loading conditions. The ratchet occurrence conditions plotted in a non-dimensional stress parameter plot similar to the Bree diagram. The findings suggest that secondary stress rises for the occurrence of ratchet conditions as primary stress decreases. It also found a heavy frequency dependency feature. The nature of the input frequency of cyclic loading in the proposed ratchet diagram has been discussed in terms of dynamic displacement over static displacement in the change of non-dimensional frequency of the loading.

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