Abstract
Crack propagation behaviour in single edge notched specimens prepared from medium-density polyethylene (MDPE) pipe is examined under creep condition. The crack grown from an exterior notch (inbound) initiated faster than that grown from an interior notch (outbound). Subsequently, the outbound crack propagated monotonically to ultimate failure. The inbound crack showed anomalous behaviour involving two arrest stages prior to ultimate failure. The pipe is found to possess substantial residual stresses. The energy release rate for each case was calculated taking into account the respective residual stream distribution. The fact that the rates of crack propagation are not a unique function of the energy release rate indicates that the fracture is also influenced by morphological gradients imposed by processing conditions.
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Chaoui, K., Chudnovsky, A. & Moet, A. Effect of residual stress on crack propagation in MDPE pipes. J Mater Sci 22, 3873–3879 (1987). https://doi.org/10.1007/BF01133334
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DOI: https://doi.org/10.1007/BF01133334