Investigation of the Effect of Composite Patch Dimensions on Patch Efficiency in Cracked Plate Repair by Considering Different Crack Angles

In this study, the effect of thickness, length and width of each of the composite patches of boron, glass, graphite and carbon epoxy on the stress intensity factor of the first and second modes in one-sided and two-sided repair of the cracked aluminum plate at different crack angles ۰ to ۹۰ degrees has been studied. For this purpose, the repaired cracked plate with each of the composite patches is modeled in ۳D in Abaqus software. The results show that in both one-sided and two-sided repair modes, increasing the patch thickness except for the glass patch has reduced the stress intensity factor of the first and second modes. The results also show that increasing the length of the patches for all four patches in both one-sided and two-sided repair modes for all angles from ۰ to ۹۰ degrees slightly increases the stress intensity factor. Increasing the width of the glass patch in one-sided repair has a different behavior than the other three patches, so that it does not change almost at an angle of ۰ to ۳۰ degrees, but decreases slightly from an angle of ۳۰ to ۹۰ degrees, but the other three patches increase from ۰ to ۴۵ degrees and decrease from ۴۵ to ۹۰ degrees, and the stress intensity factor of the second mode for all four patches in all angles decreases with increasing patch width.