Impact Damage Growth in Fiberglass/Epoxy Laminates Subjected toMoisture and Low Temperature Thermal Cycling

摘要

A study of delamination damage growth in a fiberglass/epoxy laminaterncomposite subjected to low velocity impacts, moisture and lowrntemperature thermal cycling was undertaken. The research addressesrntwo different ply configurations [0/90/0/90/02]s & [02/902/02]s, threernimpact energies 5J, 10J, & 15J and two impact masses 7.25 kg & 12.25rnkg, at both dry and wet service conditions. Test specimens werernsubjected to 500 thermal cycles between 25℃ and -40℃ to determinernthe extent of delamination growth due to the effects of moisture andrndiffering coefficients of thermal expansion. Visual digital photographyrntechniques were utilized to determine the level of initial damage causedrnby impact and subsequent damage growth from thermal cycling.