Fatigue crack growth numerical analysis of CPVC: effect of temperature and load frequency
Published 2019-01-02
Keywords
- CPVC,
- fracture mechanic,
- fatigue crack growth,
- load frequency and temperature,
- the boundary element method.
How to Cite
Abstract
An analysis of combined effect of temperature and load frequency on the fatigue crack growth rate and cracking velocity for Chlorinated Polyvinyl Chloride (CPVC) is presented in this paper. CPVC is a thermoplastic material used for piping systems where higher temperature and chemical resistance are important, becoming a good alternative to metals. The Dual Boundary Element Method (DBEM) is used to determine three dimensional states of stresses and strains at each increment of crack. Stress intensity factors at the crack tip are determined using the J-integral, and the crack growth direction is defined by the maximum principal stress criteria. A mathematical model proposed by Kim & Wang in 1994 based on experimental results is applied to predict cracking velocity. In this work, a specimen with lateral crack using temperature values between 23 and 70 ºC and frequencies between 0.1 and 10 Hz is evaluated. The results show that cracking velocity increases with temperature increase and with frequency decrease. These results are compared to Paris & Erdogan model showing good agreement which reveals that DBEM could be an accurate tool to investigate the prediction of crack growth in polymers.
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References
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