Innovative computational modeling of multiaxial fatigue analysis for notched components

Ince, Ayhan; Glinka, G.

doi:10.1016/j.ijfatigue.2015.03.019

Cited by 65 publications

(55 citation statements)

References 15 publications

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“…, includes the sum of

τ_{\max} γ_{a}^{e}

, the term relating elastic shear strain energy, plastic shear strain energy,

τ_{a} γ_{a}^{p}

, elastic normal strain energy,

σ_{\max} ε_{a}^{e}

, and plastic normal strain energy,

σ_{a} ε_{a}^{p}

terms. Authors showed that generalised strain energy damage model was in good agreement with sets of experimental multiaxial fatigue data …”

Section: The Proposed Mean Stress Correction Modelmentioning

confidence: 78%

A mean stress correction model for tensile and compressive mean stress fatigue loadings

Ince

2016

Fatigue Fract Eng Mat Struct

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A new mean stress fatigue model based on the distortional strain energy is proposed to account for the mean stress effects on fatigue life. The proposed model is compared with the Morrow and the Smith‐Watson‐Topper (SWT) mean stress correction models using a number of experimental data sets for one cast iron, two steels and two aluminium alloys under tensile and compressive mean stress loadings. It is found that both the proposed mean stress correction model and the SWT model yield similar results and provide very good correlation for positive mean stress data and moderate negative mean stress data. For high compressive mean stresses, the proposed model shows reasonably good correlations, while the SWT model fails to correlate the fatigue data. The Morrow model was found to give poor correlations for all fatigue data analysed by yielding conservative results for compressive mean stresses and non‐conservative results for tensile mean stresses.

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“…, includes the sum of

τ_{\max} γ_{a}^{e}

, the term relating elastic shear strain energy, plastic shear strain energy,

τ_{a} γ_{a}^{p}

, elastic normal strain energy,

σ_{\max} ε_{a}^{e}

, and plastic normal strain energy,

σ_{a} ε_{a}^{p}

terms. Authors showed that generalised strain energy damage model was in good agreement with sets of experimental multiaxial fatigue data …”

Section: The Proposed Mean Stress Correction Modelmentioning

confidence: 78%

A mean stress correction model for tensile and compressive mean stress fatigue loadings

Ince

2016

Fatigue Fract Eng Mat Struct

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“…For a notched body experiencing general multiaxial loading, there exhibits plane stress state at the notch due to traction‐free surface, as sketched in Figure A. The stress‐strain states at the notch region take the forms of

σ_{ij} = ([], \begin{array}{c} σ_{x} & σ_{xy} & 0 \\ σ_{xy} & σ_{y} & 0 \\ 0 & 0 & 0 \end{array}) = ([], \begin{array}{c} σ_{x} & τ_{xy} & 0 \\ τ_{xy} & σ_{y} & 0 \\ 0 & 0 & 0 \end{array}),

ε_{ij} = ([], \begin{array}{c} ε_{x} & ε_{xy} & 0 \\ ε_{xy} & ε_{y} & 0 \\ 0 & 0 & ε_{z} \end{array}) = ([], \begin{array}{c} ε_{x} & γ_{xy} / 2 & 0 \\ γ_{xy} / 2 & ε_{y} & 0 \\ 0 & 0 & ε_{z} \end{array}) .

By means of the linear elastic FEA or linear elasticity theory, the pseudoelastic strains at the notch region can be obtained.…”

Section: Proposed Local Nonproportionality Factor Estimation Methods Umentioning

confidence: 99%

“…Multiaxial loading paths can produce complex stress‐strain responses at the notch area and cause a fatigue failure problem at or near the notch root . In order to satisfy the increasing design requirement for notched components in accordance with lifetime expectancy, light weight, and cost reduction, an efficient and reliable numerical methodology to the fatigue life predictions of practical notched components is urgently needed …”

Section: Introductionmentioning

confidence: 99%

Notch fatigue life prediction considering nonproportionality of local loading path under multiaxial cyclic loading

Tao

Zhang

Zhu

et al. 2019

Fatigue Fract Eng Mat Struct

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An innovative numerical methodology is presented for fatigue lifetime estimation of notched bodies experiencing multiaxial cyclic loadings. In the presented methodology, an evaluation approach of the local nonproportionality factor F for notched specimens, which defines F as the ratio of the pseudoshear strain range at 45° to the maximum shear plane and the maximum shear strain range, is proposed and discussed deeply. The proposed evaluation method is incorporated into the material cyclic stress‐strain equation for purpose of describing the nonproportional hardening behavior for some material. The comparison between multiaxial elastic‐plastic finite element analysis (FEA) and experimentally measured strains for S460N steel notched specimens shows that the proposed nonproportionality factor estimation method is effective. Subsequently, the notch stresses and strains calculated utilizing multiaxial elastic‐plastic FEA are used as input data to the critical plane‐based fatigue life prediction methodology. The prediction results are satisfactory for the 7050‐T7451 aluminum alloy and GH4169 superalloy notched specimens under multiaxial cyclic loading.

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“…The same indicator is also employed to model crack propagation in the sense of a spatial evolving region of material failure. Depending on the fatigue damage behavior of the considered material different indicators can be appropriate [8], [9].…”

Section: Methodsmentioning

confidence: 99%

Fatigue crack growth modeling in the metallization of power semiconductors under cyclic thermo-mechanical loading

Springer

Nelhiebel

Pettermann

2016

2016 17th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and

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Power semiconductors may be subjected to short electric overload pulses during operation, which induce very high temperatures and temperature gradients in the multilayer chip structure. This can lead to material degradation in the ductile metallization and repetitive overload conditions can result in overheating and destruction of the device. A unified approach is presented predicting material degradation in terms of fatigue crack nucleation and fatigue crack propagation, to identify a tolerable number of electric overload pules during operation. Fatigue Indicators based on mechanical quantities are utilized to identify locations of material failure in the power metallization and material degradation is modeled. Repetitive loading leads to an evolving damage zone. The proposed approach is implemented within the framework of the Finite Element Method and exemplified at a simplified, generic metallization stack.

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Innovative computational modeling of multiaxial fatigue analysis for notched components

Cited by 65 publications

References 15 publications

A mean stress correction model for tensile and compressive mean stress fatigue loadings

A mean stress correction model for tensile and compressive mean stress fatigue loadings

Notch fatigue life prediction considering nonproportionality of local loading path under multiaxial cyclic loading

Fatigue crack growth modeling in the metallization of power semiconductors under cyclic thermo-mechanical loading

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