Experimental and Numerical Investigation of Shot-Peening and Solidification Effects on the Endurance Limit of Composite Material

Abstract

This work studied experimentally and numerically the effect of the shot-peening on the properties of fatigue of composite materials during the solidification period of composite material. Different two type of composite material have been investigated, woven (matt) reinforcement E-fiber glass with matrix epoxy resin, the second type made from random reinforcement E-fiber glass with matrix epoxy resin. Different shot peening times and also different times of solidification have been studied in this work. The experimental work includes calculating the mechanical properties (modulus of elasticity and the ultimate tensile stress) using the tensile test, also calculating the fatigue stress using the fatigue test. The numerical verification was done using ANSIS\\ Workbench.15 to obtain the S-N curves of the composite material. The result shows, the best enhancement in fatigue strength had been 95% and 33.78% for matt reinforcement material and random reinforcement material respectively, both types have the best improvement at 6 minutes shot peening time (SPT) and on two days of solidification. The numerical verification shows an agreement with the experimental results of the S-N curves, in which the maximum percentage error between the experimental and numerical results does not exceed 12 % and 15.12% for the matt reinforced material and for the random reinforced material respectively.