scholarly journals A Modified Fatigue Damage Model for High-Cycle Fatigue Life Prediction

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Meng Wang ◽  
Qingguo Fei ◽  
Peiwei Zhang
Keyword(s):  
Damage Mechanics ◽  
High Cycle Fatigue ◽  
Failure Process ◽  
Damage Model ◽  
Continuum Damage Mechanics ◽  
Cycle Fatigue ◽  
Damage State ◽  
Damage Evolution Equation ◽  
Metal Material ◽  
Python Language

Based on the assumption of quasibrittle failure under high-cycle fatigue for the metal material, the damage constitutive equation and the modified damage evolution equation are obtained with continuum damage mechanics. Then, finite element method (FEM) is used to describe the failure process of metal material. The increment of specimen’s life and damage state can be researched using damage mechanics-FEM. Finally, the lifetime of the specimen is got at the given stress level. The damage mechanics-FEM is inserted into ABAQUS with subroutine USDFLD and the Python language is used to simulate the fatigue process of titanium alloy specimens. The simulation results have a good agreement with the testing results under constant amplitude loading, which proves the accuracy of the method.

A model of continuum damage mechanics for high cycle fatigue of metallic materials

2012 ◽  
Vol 22 (11) ◽  
pp. 2777-2782 ◽  
Author(s):  
Liang ZHANG ◽  
Xue-song LIU ◽  
Lin-sen WANG ◽  
Shuang-hui WU ◽  
Hong-yuan FANG
Keyword(s):  
Damage Mechanics ◽  
High Cycle Fatigue ◽  
Continuum Damage Mechanics ◽  
Continuum Damage ◽  
Metallic Materials ◽  
Cycle Fatigue

Study on Continuum Damage Mechanics Model for High Cycle Fatigue

2016 ◽  
Vol 835 ◽  
pp. 564-567
Author(s):  
Xin Tong Shi ◽  
Ying Chun Xiao ◽  
Hong Chen ◽  
Bo Huang
Keyword(s):  
Experimental Data ◽  
Damage Mechanics ◽  
High Cycle Fatigue ◽  
Continuum Damage Mechanics ◽  
Fatigue Loading ◽  
Continuum Damage ◽  
Cycle Fatigue ◽  
Stress Effects ◽  
Mechanics Model ◽  
Proposed Model

A continuum damage mechanics model was proposed to predict the high cycle fatigue life. In order to consider mean stress effects, the Walker correction was introduced in proposed model. The model was verified by experimental data on LC4 and LY12CZ aluminum alloy under high cycle fatigue loading. The results showed that the predicted life of proposed model well correlated with experimental data.

scholarly journals A continuum damage mechanics-based approach for the high cycle fatigue behavior of metallic polycrystals

2018 ◽  
Vol 28 (6) ◽  
pp. 838-856 ◽  
Author(s):  
Charles Mareau ◽  
Franck Morel
Keyword(s):  
Normal Stress ◽  
Damage Mechanics ◽  
High Cycle Fatigue ◽  
Fatigue Behavior ◽  
Constitutive Relations ◽  
Continuum Damage Mechanics ◽  
Elastic Behavior ◽  
Internal Stresses ◽  
Continuum Damage ◽  
Cycle Fatigue

Polycrystalline elasto-plasticity models provide a general framework for investigating the effect of microstructural heterogeneities (e.g. grains, inclusions, pores) on the high cycle fatigue behavior of metallic materials. In this work, continuum damage mechanics is used to construct a set of constitutive relations to describe the progressive degradation of certain mechanical properties at the grain scale. The damage is considered to be coupled with the elastic behavior of the material. Special care is taken to include the anisotropic aspect of fatigue damage and the effect of intragranular internal stresses. The constitutive relations are then implemented within a self-consistent model to evaluate intergranular interactions. Finally, the model is used to investigate the high cycle fatigue behavior of polycrystalline copper. It is shown that the influence of certain loading conditions on the high cycle behavior is correctly reproduced. Specifically, the application of a mean shear stress does not result in an increase in damage; however, a mean normal stress is damaging. That is, a decrease in the fatigue resistance is predicted when the mean normal stress is increased.

Identification and Validation of a Low Cycle Fatigue Damage Model for Al 7075-T6 Alloy

2015 ◽  
Vol 137 (1) ◽  
Author(s):  
Saeed Masih ◽  
Mohammad Mashayekhi ◽  
Noushin Torabian
Keyword(s):  
Damage Mechanics ◽  
Low Cycle Fatigue ◽  
Damage Model ◽  
Fatigue Crack Initiation ◽  
Life Time ◽  
Continuum Damage Mechanics ◽  
Material Behavior ◽  
Cycle Fatigue ◽  
Explicit Finite Element ◽  
Al 7075

In this paper, the behavior of 7075-T6 aluminum alloy under low cycle fatigue (LCF) loading is experimentally and numerically investigated using continuum damage mechanics (CDM). An experimental procedure is established to identify the damage parameters for Al 7075-T6. A damage-coupled explicit finite element code is developed using the experimentally extracted damage parameters to study the material behavior under LCF loading. Moreover, fractographic examinations are conducted to identify the fatigue crack initiation locations and propagation mechanisms. The model is employed for life-time assessment of stringer-skin connection of a fuselage and the results are compared with the data available in the literature.

scholarly journals A continuum damage mechanics model for fatigue and degradation of fiber reinforced materials

2020 ◽  
Vol 54 (21) ◽  
pp. 2837-2852
Author(s):  
Jörg Hohe ◽  
Monika Gall ◽  
Sascha Fliegener ◽  
Zalikha Murni Abdul Hamid
Keyword(s):  
Damage Mechanics ◽  
Damage Model ◽  
Continuum Damage Mechanics ◽  
Material Model ◽  
Continuum Damage ◽  
Fiber Reinforced ◽  
Finite Element Program ◽  
Damage Evolution Equation ◽  
Fiber Reinforced Materials ◽  
Reinforced Materials

Objective of the present study is the definition of a continuum damage mechanics material model describing the degradation of fiber reinforced materials under fatigue loads up to final failure. Based on the linear elastic framework, a brittle damage model for fatigue conditions is derived, where the damage constitutes the only nonlinearity. The model accounts for damage effects by successive degradation of the elastic moduli. Assuming that material damage is driven by microplastic work, a stress-driven damage evolution equation is defined. For generality, a fully three-dimensional formulation on single ply level is employed. The model is implemented into a finite element program. In a validation against experimental data on filament-wound carbon fiber reinforced material, the model proves to provide a good numerical approximation of the damage during the cyclic loading history up to final material failure.

scholarly journals 3D Anisotropic Elastoplastic-Damage Model and its Application in Simulating the Behavior of Rock Materials

2006 ◽  
Vol 324-325 ◽  
pp. 579-582
Author(s):  
Jun Feng Zhang ◽  
Tao Qi
Keyword(s):  
Damage Evolution ◽  
Damage Mechanics ◽  
Rock Sample ◽  
Progressive Failure ◽  
Failure Process ◽  
Damage Model ◽  
Tensor Decomposition ◽  
Continuum Damage Mechanics ◽  
Proposed Model ◽  
Elastoplastic Damage

A 3D anisotropic elastoplastic-damage model was presented based on continuum damage mechanics theory. In this model, the tensor decomposition technique is employed. Combined with the plastic yield rule and damage evolution, the stress tensor in incremental format is obtained. The derivate eigenmodes in the proposed model are assumed to be related with the uniaxial behavior of the rock material. Each eigenmode has a corresponding damage variable due to the fact that damage is a function of the magnitude of the eigenstrain. Within an eigenmodes, different damage evolution can be used for tensile and compressive loadings. This model was also developed into finite element code in explicit format, and the code was integrated into the well-known computational environment ABAQUS using the ABAQUS/Explicit Solver. Numerical simulation of an uniaxial compressive test for a rock sample is used to examine the performance of the proposed model, and the progressive failure process of the rock sample is unveiled.

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