A Strain-based continuum damage model for low cycle fatigue under different strain ratios

2021 ◽  
Vol 242 ◽  
pp. 107479
Author(s):  
V.B. Pandey ◽  
I.V. Singh ◽  
B.K. Mishra
Keyword(s):  
Low Cycle Fatigue ◽  
Damage Model ◽  
Continuum Damage ◽  
Cycle Fatigue ◽  
Continuum Damage Model

An anisotropic continuum damage model for high-cycle fatigue

2020 ◽  
pp. 1-15
Author(s):  
Liang Zhang ◽  
Zhenyuan Gao ◽  
Robert A. Haynes ◽  
Todd C. Henry ◽  
Wenbin Yu
Keyword(s):  
High Cycle Fatigue ◽  
Damage Model ◽  
Continuum Damage ◽  
Cycle Fatigue ◽  
Continuum Damage Model

Continuum Damage Model of Creep-Fatigue Interaction in Ni-Base Superalloy

2007 ◽  
Vol 340-341 ◽  
pp. 235-240 ◽  
Author(s):  
Jong Taek Yeom ◽  
Chong Soo Lee ◽  
Jeoung Han Kim ◽  
Dong Geun Lee ◽  
Nho Kwang Park
Keyword(s):  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Equivalent Stress ◽  
Damage Model ◽  
Fem Simulation ◽  
Interaction Region ◽  
Continuum Damage ◽  
Continuum Damage Model ◽  
Creep Fatigue ◽  
The Continuum

A methodology for evaluating and predicting component lives in creep-fatigue interaction region was investigated for Waspaloy. A unified viscoplasticity constitutive equation including multi-back stresses was used to describe cyclic material behaviors. Also, a continuum damage model coupling with the creep-fatigue damage rules was established based on the analysis of creep and low cycle fatigue behavior. Multi-axial fatigue and creep equivalent stress concepts were employed to predict three dimensional component lives. Notched cyclic tests under various stress conditions in the creep-fatigue interaction region were carried out to validate the life prediction methodology with FEM simulation based on the continuum damage model. The comparison of experimental data and prediction results indicates that the continuum damage model is a powerful approach for the prediction of component lives.

A Multi-Level Low Cycle Fatigue Damage Model for Forging Die Material

2006 ◽  
Vol 514-516 ◽  
pp. 804-809
Author(s):  
S. Gao ◽  
Ewald Werner
Keyword(s):  
Fatigue Life ◽  
Fatigue Damage ◽  
Low Cycle Fatigue ◽  
Damage Model ◽  
Fatigue Loading ◽  
Cycle Fatigue ◽  
Die Material ◽  
Multi Level ◽  
Loading Sequence ◽  
Forging Die

The forging die material, a high strength steel designated W513 is considered in this paper. A fatigue damage model, based on thermodynamics and continuum damage mechanics, is constructed in which both the previous damage and the loading sequence are considered. The unknown material parameters in the model are identified from low cycle fatigue tests. Damage evolution under multi-level fatigue loading is investigated. The results show that the fatigue life is closely related to the loading sequence. The fatigue life of the materials with low fatigue loading first followed by high fatigue loading is longer than that for the reversed loading sequence.

Modified Dyson Continuum Damage Model for Austenitic Steel Alloy

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
Seok Jun Kang ◽  
Hoomin Lee ◽  
Jae Boong Choi ◽  
Moon Ki Kim
Keyword(s):  
Damage Model ◽  
Life Time ◽  
Continuum Damage ◽  
Creep Life ◽  
Creep Tests ◽  
Continuum Damage Model ◽  
Thermal Plant ◽  
Uniaxial Creep ◽  
Term Creep

Ultrasuper critical (USC) thermal plants are now in operation around the globe. Their applications include superheaters and reheaters, which generally require high temperature/pressure conditions. To withstand these harsh conditions, an austenitic heat-resistant HR3C (ASME TP310NbN) steel was developed for metal creep resistance. As the designed life time of a typical thermal plant is 150,000 h, it is very important to predict long-term creep behavior. In this study, a three-state variable continuum damage model (CDM) was modified for better estimation of long-term creep life. Accelerated uniaxial creep tests were performed to determine the material parameters. Also, the rupture type and microstructural precipitation were observed by scanning electron microscopy. The creep life of HR3C steel was predicted using only relatively short-term creep test data and was then successfully verified by comparison with the long-term creep data.

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