A multiaxial fatigue damage model for isotropic materials

Conference paper (2020)

Authors

Maurício V. Donadon Division of Fundamental Science
Mariano A. Arbelo Division of Fundamental Science
Paulo Rizzi Division of Fundamental Science
Carlos V. Montestruque Division of Fundamental Science
Lucas Amaro Division of Fundamental Science
Saullo G.P. Castro Aerospace Structures & Computational Mechanics - Aerospace Engineering
Marcos Shiino São Paulo State University
Research Group
Aerospace Structures & Computational Mechanics (Aerospace Engineering) (TU Delft)
Finite elements Damage mechanics Damage propagation Smeared cracking approach
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Published Date

01-01-2020

Language

English

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Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Aerospace Structures & Computational Mechanics

Abstract

This paper presents a novel damage mechanics based failure model enabling the prediction of low cycle fatigue life and residual strength of isotropic structures under multiaxial loading. The approach herein proposed does not discretize every load cycle but instead takes an envelope loading whereby the numerical load remains constant at a maximum load level and the number of cycles is obtained from a given elapsed time defined within a pseudo-time framework. The proposed formulation is based on the smeared cracking approach accounting for damage propagation due to static and fatigue loadings, where the static component is based on the Von-Mises yield criterion and Prandtl-Reuss stress flow rule; whereas the crack propagation in cyclic loading component is based on the Paris-law. Furthermore, the formulation combines damage mechanics and fracture mechanics within a unified approach enabling the control of the energy dissipated in each loading cycle.