Experimental Study on the Fatigue Crack Growth and Overload Effect in Medium Density Polyethylene
Source abstract
Abstract
The fatigue crack growth behavior of medium-density polyethylene (MDPE) under constant amplitude load was experimented on plate specimens. The effect of additional imposed single overload was also researched. An optimized crack front marking method was developed to obtain the actual crack front shape of polymer materials in fatigue crack growth, which was successfully applied to the studied MDPE. The results showed that the retardation of fatigue crack growth evidently appeared after the tensile overload was applied, which was similar to metallic materials. The passivation of the wedge-shaped plastic zone was a primary cause to crack retardation. The theory based on residual stress was introduced to describe the retardation effect, and the plastic zone size of crack tip was calculated by the Dugdale model. The Wheeler model was successfully used to fit the decreased crack growth rate.
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Research context
OpenAlex topics: Fatigue and fracture mechanics · Mechanical Behavior of Composites · Asphalt Pavement Performance Evaluation
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References (27)
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