Contribution to fatigue damage prediction of thin shell finite element models

Milan Sága,Tomasz Domański,Wiesława Piekarska,Peter Kopas,Milan Vaško,Marcin Kubiak,M Vasko,L Jakubovičová,M Blatnická,M Handrik,O Štalmach,A Sapietová,P Kopas,M Sága,V Baniari

doi:10.1051/matecconf/201815701017

Milan Sága, Tomasz Domański + Show 13 more

Open Access

https://doi.org/10.1051/matecconf/201815701017

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Abstract

The paper deals with the implementation of the chosen fatigue damage criterions into FE analysis. Our study considers a shell finite element structural analysis in conjunction with the multiaxial rainflow counting and the fatigue damage prediction. The computational analysis considers stochastic response under random excitation in time domain and damage calculation based on so called critical plane approach (CPA).

Highlights

Fatigue damage of structural features is a complex physical process which is governed by a great number of parameters related to, for example, local geometry and material properties of the structural region surrounding the crack growth path
There is needed an integration for such a procedures into a modern systems of computing aided design (CAD) [6,7,8] in relationship to methods of strength computing transferred by finite element method (FEM) [9,10,11]
It means that the important goal of this part will be to propose some approaches to estimate the high-cycle fatigue damage for multiaxial stresses caused by random vibration analysed structure [10, 16, 17]

Summary

Introduction

Fatigue damage of structural features is a complex physical process which is governed by a great number of parameters related to, for example, local geometry and material properties of the structural region surrounding the crack growth path. Despite of this research no results have been achieved, which could be considered as successful ones. This applies mainly to the cases of random and combined stress, where today’s procedures used in one axis stress analysis fails [2]. Research of mechanism and processes of fatigue failure of materials achieves great advance, there still doesn’t exist general failure model, which should be applicable for different conditions of activity. There is needed an integration for such a procedures into a modern systems of computing aided design (CAD) [6,7,8] in relationship to methods of strength computing transferred by finite element method (FEM) [9,10,11]

Thin shell stress calculation

Chosen approaches for multiaxial fatigue damage calculation

Testing example

Conclusion