| Summary: | Fiber Reinforced Polymer (FRP) is a composite material that consists of a polymer matrix embedded with high strength fibers, such as glass, aramid, and carbon. FRP laminate to be improved on the matrix cracking which the damage between fiber in the layer parallel. However, the studies on this fatigue crack initiation, including on matrix cracking under fatigue loading. This paper aims to emphasize a study on the effect of fiber angle orientation on fatigue strength of FRP, which are [+45°] and [−45°]. The method of laminate is isotropic with the same material properties in all directions, and normal loads create only normal strains. The model of isotropic laminate simulation that will be used is [+45°/−45°] as the angle orientation. The model size is 250 × 25 × 8 mm in rectangular bar according to the ASTM D 3309 and ABS rules for thickness 8 mm part of the hull. The simulation of the fatigue test by using the Ansys software. The results were presented in the form of simulation results, showing that [+45°] orientation has a higher fatigue strength as a function of angle orientation. The benefit of result on isotropic in FRP laminate for the naval architecture and can be a guideline for the boat building industry. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.
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