An Integrated Creep-Fatigue Theory for Material Damage Modeling

Xi Jia Wu

doi:10.4028/www.scientific.net/KEM.627.341

Paper Titles

Analytical 1D Model of Delamination Development and Strength of Layered Composite Beam in Post-Buckling
p.325

Microindentation Test Modelling in the Silicon Nitride Ceramics by Application of the Cohesive Zone Approach
p.329

Comparative Study on the Fatigue Behaviour of SCC and VC
p.333

Review of FE-Based Fatigue Evaluation Methods for the Rib to Floorbeam Welds in Orthotropic Bridge Decks
p.337

An Integrated Creep-Fatigue Theory for Material Damage Modeling
p.341

Stress Analysis of Cracked MMCs with Lamellar Microstructure
p.345

Continuum Approach to Computational Multi-Scale Modeling of Fracture
p.349

Correlation of Dent Depth to Maximum Contact Force and Damage of Composite Laminates
p.353

Meshless Approaches for Fracture with Nonlocal Elasticity
p.357

HomeKey Engineering MaterialsKey Engineering Materials Vol. 627An Integrated Creep-Fatigue Theory for Material...

An Integrated Creep-Fatigue Theory for Material Damage Modeling

Abstract:

This paper presents an integrated creep-fatigue (ICF) theory to describe the non-linear creep-fatigue interaction during thermomechanical loading. The ICF theory recognizes the damage evolution as a holistic process consisting of nucleation and propagation of surface or subsurface cracks in coalescence with internally distributed damage, leading to final fracture. In a polycrystalline material under combined cyclic and dwell loading, crack nucleation and propagation occurs by fatigue or oxidation mechanisms, whereas internally distributed damage often occurs in the form of grain boundary cavities or microcracks due to creep or dwell effects, particularly at high temperatures. Based on the above mechanism, a damage evolution equation is mathematically derived, and the generality of the above physical mechanisms warrants the applicability of the ICF theory over a wide range of stresses and temperatures. This paper uses Mar-M 509, a cobalt base superalloy, as an example to illustrate how the ICF theory describes creep and low cycle fatigue (LCF).

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Advances in Fracture and Damage Mechanics XIII

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Periodical:

Key Engineering Materials (Volume 627)

Pages:

341-344

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.627.341

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Online since:

September 2014

Authors:

Xi Jia Wu*

Keywords:

Creep-Fatigue Interaction, Damage Evolution, Life Prediction

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