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Computers and Structures 85 (2007) 225 232
A finite element creep crack growth model for Waspaloy
Martin G o¨tting *, Joachim R o¨sler
Institut fu¨r Werkstoffe,Technische Universita¨t Braunschweig, 31226 Peine, Germany
Received 1 June 2005; accepted 8 August 2006
Available online 24 October 2006
stic and creep deformations lead to reduced stress levels ahead of the crack tip in a creep crack growth test. However, they c so
cause microcracks, cavities and other defects forcing fracture. Numerous damage models are reported in the li ture to describe the
behavior. In this article, a damage model will be developed from different theories and will be used to describe the creep crack growth
behavior of Waspaloy at 973 K. Material parameters for this model are adjusted to uniaxial creep and tensile tests. The calculated creep
crack growth curves match very well with the experimental ones supporting the model.
Ó 2006 Elsevier . s .
Keywords: Creep crack growth; Damage mechanics; Cavities; High temperature behavior; Nickel base superalloys; Finite elements
1. Introduction tion of a single spherical void. A yield condition is pro-
posed which contains the hydrostatic pressure and the
Many mechanisms such as microcracking and for- volume fraction of voids in addition to the equivalent
mation due to time t sticity, creep and fatigue stress. The fraction of cavities changes
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