A fatigue model for sensitive materials to non-proportional loadings

Babaei, Saeid; Ghasemi-Ghalebahman, Ahmad; Hajighorbani, Ramezanali

doi:10.1016/j.ijfatigue.2015.06.009

Cited by 16 publications

(8 citation statements)

References 21 publications

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“…The SWT model as ECP model has shown excellent life predictions for uniaxial fatigue and tensiondominated multiaxial fatigue but not for shear-dominated multiaxial fatigue (Roostaei and Jahed, 2017;Wu et al, 2014). Note that the SWT model provides overpredicted lives than experimental lives for multiaxial fatigue (Albinmousa and Jahed, 2014;Babaei et al, 2015;Wang et al, 2014;Wu et al, 2014). The research of previous section on the interaction between normal and shear behavior can explain the weakness of SWT model for multiaxial fatigue and the designed tests SS6 and SS7 can explain it well from the point of view of strain energy as shown in Figure 7.…”

Section: Generalized Ecp Modelmentioning

confidence: 99%

Strain energy-based multiaxial fatigue life prediction under normal/shear stress interaction

Zhu

Liu

et al. 2018

International Journal of Damage Mechanics

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Through characterizing the interaction of normal/shear stress–strain behavior on material planes of TC4 alloys, a new strain energy critical plane model describing mean stress effects is proposed for life prediction under tension–compression, pure torsion, and tension–torsion loadings. Moreover, a modified Ince–Glinka model is elaborated through considering crack surface close to the maximum shear strain plane. Three simple solutions are presented to determine cracking failure mode using the concepts of life, damage, and strain. Comparing with lifing models of Liu, Smith–Watson–Topper, and modified Ince–Glinka, the proposed model provides more accurate life predictions for TC4 and a compressor turbine disc by full-scale fatigue testing.

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Section: Generalized Ecp Modelmentioning

confidence: 99%

Strain energy-based multiaxial fatigue life prediction under normal/shear stress interaction

Zhu

Liu

et al. 2018

International Journal of Damage Mechanics

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“…The SWT model as the critical plane model is also considered as an energy-based approach and its parameter can be understood as normal energy which has shown a satisfactory life prediction for uniaxial fatigue but not for multiaxial fatigue [ 20 ]. It was found that SWT damage parameters are smaller than the calculated parameter as shown in Figure 2 , and tends to overestimate fatigue life of GH4169 under multiaxial loadings [ 20 , 21 , 22 , 23 ]; more details on experimental results and data can be found in Section 4 . The reason is that it doesn’t consider the effect of shear behavior.…”

Section: Proposed Energy-critical Plane Damage Parameter For Multimentioning

confidence: 99%

“…Smith, Watson and Topper [ 18 ] pointed out that fatigue failure is predominantly caused by crack growth on planes of maximum principle strain or stress. It was acknowledged that the SWT model is suitable to predict life for materials failure under the tensile cracking mode and has relatively poor life-prediction accuracy for pure torsion and multiaxial fatigue loadings [ 20 , 21 , 22 , 23 ]. The SWT parameter was modified by Jiang and Sehitoglu [ 24 ] to consider the general crack cracking mode and has a reasonable prediction for different crack behaviors with appropriate values of material constant [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

A New Energy-Critical Plane Damage Parameter for Multiaxial Fatigue Life Prediction of Turbine Blades

Zhu

Liu

et al. 2017

Materials

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As one of fracture critical components of an aircraft engine, accurate life prediction of a turbine blade to disk attachment is significant for ensuring the engine structural integrity and reliability. Fatigue failure of a turbine blade is often caused under multiaxial cyclic loadings at high temperatures. In this paper, considering different failure types, a new energy-critical plane damage parameter is proposed for multiaxial fatigue life prediction, and no extra fitted material constants will be needed for practical applications. Moreover, three multiaxial models with maximum damage parameters on the critical plane are evaluated under tension-compression and tension-torsion loadings. Experimental data of GH4169 under proportional and non-proportional fatigue loadings and a case study of a turbine disk-blade contact system are introduced for model validation. Results show that model predictions by Wang-Brown (WB) and Fatemi-Socie (FS) models with maximum damage parameters are conservative and acceptable. For the turbine disk-blade contact system, both of the proposed damage parameters and Smith-Watson-Topper (SWT) model show reasonably acceptable correlations with its field number of flight cycles. However, life estimations of the turbine blade reveal that the definition of the maximum damage parameter is not reasonable for the WB model but effective for both the FS and SWT models.

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“…Socie further improved SWT parameter to evaluate the multiaxial fatigue behavior of materials dominated by tensile‐type failure. Unfortunately, SWT parameter has been proved to be ineffective for many materials, particularly for some materials dominated by shear crack nucleation and growth. This may be attributed to its incapability to consider the fatigue damage caused by shear components.…”

Section: Introductionmentioning

confidence: 99%

Use of an energy‐based/critical plane model to assess fatigue life under low‐cycle multiaxial cycles

Gan

Zhong

2019

Fatigue Fract Eng Mat Struct

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For engineering components subjected to multiaxial loading, fatigue life prediction is crucial for guaranteeing their structural security and economic feasibility. In this respect, energy‐based models, integrating the stress and strain components, are widely used because of their availability in fatigue prediction. Through employing the plastic strain energy concept and critical plane approach, a new energy‐based model is proposed in this paper to evaluate the low‐cycle fatigue life, in which the critical plane is defined as the maximum damage plane. In the proposed model, a newly defined NP factor κ* is used to quantify the nonproportional (NP) effect so that the damage parameter can be conveniently calculated. Moreover, a simple estimation method of weight coefficient is developed, which can reflect different contributions of shear and normal plastic strain energy on total fatigue damage. Experimental data of 10 kinds of materials are employed to assess the effectiveness of this model as well as three other energy‐based models.

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A fatigue model for sensitive materials to non-proportional loadings

Cited by 16 publications

References 21 publications

Strain energy-based multiaxial fatigue life prediction under normal/shear stress interaction

Strain energy-based multiaxial fatigue life prediction under normal/shear stress interaction

A New Energy-Critical Plane Damage Parameter for Multiaxial Fatigue Life Prediction of Turbine Blades

Use of an energy‐based/critical plane model to assess fatigue life under low‐cycle multiaxial cycles

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