This study investigates the tensile and fatigue behavior along with the Fracture Fatigue Entropy (FFE) of randomly oriented discontinuous glass fiber-reinforced thermoset composites with 30% (FS30) and 35% (FS35) fiber volume fractions. Tensile tests revealed similar ultimate tensile strengths, 120.16 MPa for FS30 and 120.37 MPa for FS35. However, fatigue tests at 0.4, 0.5, and 0.6 UTS, and the Run-Stop-Cooldown (RSC) method showed FS35’s superior fatigue performance with a fatigue limit of 54.1 MPa versus FS30’s 50.2 MPa. FFE, calculated using cyclic plastic strain energy and surface temperature, averaged 2.21 MJ/m3K and 2.35 MJ/m3K for FS30 and FS35, respectively. A verification test predicted the fatigue life with less than 10% error, emphasizing FFE’s effectiveness in predicting fatigue behavior.
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