Thermomechanical coupling in fatigue fracture of viscoelastic materialsSubcritical crack growth in a linear viscoelastic material subjected to cyclic loading is investigated starting with the thermodynamic power balance. Physically, it is supposed that the subcritical slow crack growth is due to local weakening of the material in the neighborhood of the crack tip. Under fatigue loading it is assumed that all energy dissipation goes into heat and that this heat build-up is the dominant irreversible process governing crack growth. The cycle averaged temperature distribution around the crack tip is obtained from local application of the first law of thermodynamics (i.e., conservation of energy). The analysis leads to the solution of a nonlinear integro-differential equation for crack length as a function of time which is coupled with the local energy equation. A regular perturbation technique is used to obtain an analytical solution which compares very well with experimental results.
Document ID
19760039641
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Hufferd, W. L. (Utah, University Salt Lake City, Utah, United States)
Laheru, K. L. (Thiokol Chemical Corp. Wasatch Div., Brigham City, Utah, United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1975
Subject Category
Structural Mechanics
Meeting Information
Meeting: Society of Engineering Science, Annual Meeting