Viscoelastic Creep Crack Growth: A Review of Fracture Mechanical Analyses |
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Authors: | Bradley W Cantwell WJ Kausch HH |
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Affiliation: | (1) Department of Mechanical Engineering, Texas A&M University, College Station, TX, U.S.A;(2) Materials Science Department, EPFL, DMX-LP, Swiss Federal Institute of Technology, 1015 Lausanne, Switzerland |
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Abstract: | The study of time dependent crack growth in polymers using a fracture mechanics approach has been reviewed. The time dependence
of crack growth in polymers is seen to be the result of the viscoelastic deformation in the process zone, which causes the
supply of energy to drive the crack to occur over time rather than instantaneously, as it does in metals. Additional time
dependence in the crack growth process can be due to process zone behavior, where both the flow stress and the critical crack
tip opening displacement may be dependent on the crack growth rate. Instability leading to slip-stick crack growth has been
seen to be the consequence of a decrease in the critical energy release rate with increasing crack growth rate due to adiabatic
heating causing are duction in the process zone flow stress, a decrease in the crack tip opening displacement due to a ductile
to brittle transition at higher crack growth rates, or an increase in the rate of fracture work due to more rapid viscoelastic
deformation. Finally, various techniques to experimentally characterize the crack growth rate as a function of stress intensity
have been critiqued.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | fracture fracture mechanics polymers viscoelastic crack growth |
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