抄録
A damage process for perforation of a plain woven glass/epoxy composite laminate was studied, using an instrumented falling weight impact test. Changes in the damage were investigated at various levels of impact energy. The damage process was divided into three different stages, according to main crack growth with fiber breakage perpendicular to fiber directions. In the first stage, surface cracks grew. Then, through-thickness cracks propagated in the second stage. In the last stage, petal bending fracture occurred. After examining cracks by fluorescent penetrant method, the main crack area was calculated approximately. In the first and second stages, a linear relation between the crack area and the absorbed impact energy was obtained. Making use of the relation, quantitative characterization of the impact damage process can be achieved.
