Low-Velocity Impact Damage of Curved Laminate Composites

초록

The dynamic response and the impact damage of curved laminate composites subjected to low-velocity impact are quite different from those of flat laminates. The radius of curvature and effective shell stiffness appeared to considerably affect the dynamic response. At a fixed impact energy level, the maximum contact force increased with decreasing radius of curvature, approaching 1.5 times that of flat plates for the radius of curvature of 50 mm. SInce the maximum contact force is closely related to impact damage, curved laminates can be more vulnerable to delamination, a representative damage induced by low-velocity impact. The result was also compared with that of a nonlinear analysis using von Karman large deflection assumption. Delamination was distributed rather evenly at each interface along the thickness direction of curved laminates. The result so far strongly implies that the effect of curv ature has to be considered for the design of curved composite laminate structures.