0
research-article

Continuum Damage Mechanics Model for Creep Crack Growth of 304 Stainless Steel

[+] Author and Article Information
Mohammad Shafinul Haque

Department of Mechanical Engineering University of Texas El Paso 500 West University Avenue; El Paso; Texas 79902, USA
mhaque@miners.utep.edu

Calvin M. Stewart

Department of Mechanical Engineering University of Texas El Paso 500 West University Avenue; El Paso; Texas 79902, USA
cmstewart@utep.edu

1Corresponding author.

ASME doi:10.1115/1.4036142 History: Received September 13, 2016; Revised February 28, 2017

Abstract

The classic Kachanov-Rabotnov (KR) creep damage model is a popular model for the design against failure due to creep deformation. However, the KR model is a local approach that can exhibit numerically unstable damage with mesh refinement. These problems have led to modified critical damage parameters and alternative constitutive models. In this study, an alternative Sine hyperbolic (Sinh) creep damage model is shown to (i) predict unity damage irrespective of stress and temperature conditions such that life prediction and creep cracking are easy to perform, (ii) develop a continuous and well-distributed damage field in the presence of stress concentrations, and (iii) is less stress-sensitive, is less mesh-dependent, exhibits better convergence than the KR model. The limitations of the KR model are discussed in detail. The KR and Sinh models are calibrated to three isotherms of 304 stainless steel creep test data. Mathematical exercises, smooth specimen simulations, and crack growth simulations are performed to produce a quantitative comparison of the numerical performance of the models.

Copyright (c) 2017 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In