, Volume 28, Issue 20, pp 5479-5485

Effect of temperature on fatigue crack growth in unplasticized polyvinyl chloride

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The effect of temperature on the fatigue crack growth in a 150 mm class 12 unplasticized polyvinyl chloride (uPVC) pipe-grade material overa temperature range −30–60°C was studied. The Arrhenius relationship between fatigue crack growth rate, da/dN, and absolute temperature, T, was found to describe the experimental data very well independent of the applied stress intensity factor range, ΔK. In the temperature range −30–10°C the activation energy was 8.8 kJ mol−1 and between 26 and 60°C this was 30 kJ mol−1. The two activation energies were found to be associated with two distinctly different crack growth mechanisms. In the low-temperature range there was a predominant shear mechanism, but in the high-temperature range multiple crazing was the major fatigue mechanism. Finally, a “stress intensity factor”—biased Arrhenius equation for fatigue crack growth was suggested and found to predict rather accurately the data of uPVC, as well as those of other polymeric materials at different temperatures.