Structural Chemistry & Crystallography Communication

Abstract

The fatigue strength of natural composite material was evaluated under stress cyclic loading with slow speed. The material that was used is a bi-directional jute/polyester composite with 40% in reinforcement. Experimental fatigue results were used to plot S-N curve which is based on Wöhler equation. Two-parameter Weibull probability was used to analysis statistically the fatigue life results of composite samples. Weibull graphics were plotted for each sample using fatigue data. Then, S–N curves were drawn for different reliability levels (Ps = 99%, Ps =90%, Ps =50%, Ps = 36,8% and Ps = 10%) using Weibull data. These S-N curves were introduced for the identification of the first failure time as reliability and safety limits of the materia