Estimating High Cycle Fatigue Lifetime using Chaboche-Lemaitre  Damage Model

High-cycle fatigue damage analysis and life prediction is a most crucial problem in the research field of solid mechanics. Based on the thermodynamic potentials in the framework of thermodynamics a numerical method for high-cycle fatigue damage was studied and provided by using a two-scale damage model. Furthermore, according to the “jump-in-cycles” procedure the numerical simulation of high-cycle fatigue damage was implemented in a user subroutine of ABAQUS software. Finally, a numerical simulation instance of high-cycle fatigue damage was provided and compared with a set of test data, which indicates that the numerical simulation method presented is reasonable and applicable.

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A constitutive high cycle fatigue damage model – based on the interaction between microplasticity and local damage*

Materials Testing ◽

10.3139/120.100714 ◽

2006 ◽

Vol 48 (3) ◽

pp. 90-93

Author(s):

Laurent Flacelière ◽

Franck Morel ◽

A. Dragon

Keyword(s):

Fatigue Damage ◽

High Cycle Fatigue ◽

Damage Model ◽

Local Damage ◽

Cycle Fatigue ◽

Model Based

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Process Induced Residual Stress Effect on Fatigue Lifetime of Automotive Steel Components

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.996.808 ◽

2014 ◽

Vol 996 ◽

pp. 808-813

Author(s):

Elias Merhy ◽

Ngadia Taha Niane ◽

Bastien Weber ◽

Philippe Bristiel

Keyword(s):

Residual Stress ◽

Heat Affected Zone ◽

High Cycle Fatigue ◽

Low Cycle Fatigue ◽

Welding Process ◽

Fatigue Loading ◽

Stress Effect ◽

Cycle Fatigue ◽

Residual Stress Field ◽

Fatigue Lifetime

Metal Active Gas (MAG) welding process of steel sheets generates, in the vicinity of the welding joint, the well-known Heat Affected Zone (HAZ) in which the material presents more microstructural defects compared to the original metal. Since high cycle fatigue is largely dependent on the material microstructure features, the HAZ is considered as the weakest zone under high cycle fatigue loading. In addition, the welding causes, in the Heat Affected Zone, irreversible plastic strains that induce important residual stress fields in this critical zone of the structure. Therefore, in order to properly predict the high cycle fatigue life time of the welded automotive components, it is of primordial importance to first identify and then consider, if necessary, the welding induced residual stress field in the structure modeling. In this work, it is found that residual stresses have non-negligible impact on high cycle fatigue lifetime, while its effect is minor in the low cycle fatigue domain.

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Analysis on High Cycle Fatigue Properties and Fatigue Damage Evolution of TC25 Titanium Alloy

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.697.658 ◽

2016 ◽

Vol 697 ◽

pp. 658-663

Author(s):

Rong Guo Zhao ◽

Ya Feng Liu ◽

Yong Zhou Jiang ◽

Xi Yan Luo ◽

Qi Bang Li ◽

...

Keyword(s):

Titanium Alloy ◽

Fatigue Life ◽

Strain Hardening ◽

Fatigue Damage ◽

Damage Evolution ◽

High Cycle Fatigue ◽

Damage Model ◽

Fatigue Properties ◽

Test Machine ◽

Cycle Fatigue

The high cycle fatigue tests for smooth specimens of TC25 titanium alloy under different stress ratios are carried out on a MTS 809 Material Test Machine at a given maximum stress level of 917MPa at ambient temperature, the high cycle fatigue lifetimes for such alloy are measured, and the effects of stress amplitude and mean stress on high cycle fatigue life are analyzed. The initial resistance is measured at the two ends of smooth specimen of TC25 titanium alloy, every a certain cycles, the fatigue test is interrupted, and the current resistance values at various fatigue cycles are measured. The ratio of resistance change is adopted to characterize the fatigue damage evolution in TC25 titanium alloy, and a modified Chaboche damage model is applied to derive the fatigue damage evolution equation. The results show that the theoretical calculated values agree well with the test data, which indicates that the modified Chaboche damage model can precisely describe the accumulated damage in TC25 titanium alloy at high cycle fatigue under unaxial loading. Finally, the high cycle fatigue lifetimes for TC25 titanium alloy specimens at different strain hardening rates are tested at a given stress ratio of 0.1, the effect of strain hardening on fatigue life is investigated based on a microstructure analysis on TC25 titanium alloy, and an expression between fatigue life and strain hardening rate is derived

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