The rationale behind this correlation is provided by the Kramer-Brown model for craze propagation and craze-crack transition where the most important intrinsic material parameter that is governing propagation and failure of crazes is the density of the network of effective entanglements which can in a straightforward way be assessed by measuring the amount of strain hardening This technique offers a relatively easy way of predicting slow crack growth resistance in materials without using surfactants. ![]() strain hardening) correlates well with the measured stress crack resistance via traditional methods. It is shown that for bimodal polyethylene materials for pipe applications the slope of the stress-strain curve above its natural draw ratio (i.e. It will be shown that resistance to slow crack growth in polyethylene can be predicted from a simple tensile strain hardening measurement at 80☌. In this paper we present a new test method to predict slow crack growth resistance in materials in a much simpler, more accurate and faster way. NPT, FNCT, PENT, ESCR etc.) performed on notched samples in contact with specific fluids at elevated temperatures. Slow crack growth resistance of polyethylene pipes and materials is usually assessed by tedious and time consuming testing methods (e.g. ![]() ![]() Resistance to slow crack growth is an important material property of polyethylene especially for pipe applications.
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