Abstract
A cracked round bar (CRB) fatigue test was employed to determine the slow crack growth (SCG) behavior of samples from high density polyethylene (HDPE) pipes using PE4710 resin. The structure property relationships of fatigue failure of polyethylene CRB specimens which have undergone various degree of electron beam (EB) irradiation were investigated by observing fatigue failure strength and the corresponding fracture surface morphology. Tensile test of these HDPE specimens showed improvements in modulus and yield strength while the failure strain decreased with increasing EB irradiation. The CRB fatigue test of HDPE pipe showed remarkable effect of EB irradiation on number of cycles to failure. The slopes of the stress-cycles to failure curve were similar for 0–100kGy; however, significantly higher slope was observed for 500kGy EB irradiated pipe. Also, the cycle to fatigue failure was seen to decrease as with EB irradiation in the high stress range, ∆σ=(16MPa to 10.8MPa); however, 500kGy EB irradiated samples showed longer cycles to failure than the un-irradiated specimens at the stress range below 9.9MPa and the corresponding initial stress intensity factor (∆KI,0)=0.712MPam1/2. The fracture surface morphology indicated that the cross-linked network in 500kGy EB irradiated PE pipe can endure low dynamic load more effectively than the parent pipe.
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