Study on Buckling Behavior of Glass Fiber Sandwich Structure

A range of glass fiber sandwich structures were manufactured utilizing VARI technology and hydrothermal accelerate aging tests were carried out for them at four temperatures (25°C, 40°C, 55°C, 75°C) with three durations (10 days, 20 days, 30 days). Subsequent buckling tests on these structures recognized the principal failure mode as overall buckling, additionally, interface debonding and foam shearing were observed, moreover, the maximum load value is negatively related to the above two hydrothermal parameters and decreased by 19.53% and 17.27% respectively after 30-day aging and the exposure at 75°C. Furthermore, SEM images of the structures’ surface suggest that as temperature and time increase, the resin dissolution are escalated contributing to more distinct undermining of buckling capacity.