玻璃纤维/环氧树脂复合材料叠层板冲击损伤特性的若干实验研究

用落重法对玻璃纤维/环氧树脂0₂/90₂/+45₂/-45₂]_s叠层板作低速冲击试验。检测复合材料内部损伤特性时,探索出一种价廉易得的元素造影液──乙酸锰/丙酮溶液代替昂贵的氯化金/乙醚溶液,可获得满意的效果。用热解剥层技术揭示了复合材料冲击损伤区的形貌特征,并研究了冲击能量与分层损伤实际面积之间的关系,发现起始层间开裂有一冲击能量门槛值,层间分层损伤面积与冲击能量呈线性关系。用扫描电镜观察冲击损伤区的微观形态,发现平行于纤维方向的开裂是基体受拉开裂、层间分层是剪切开裂。 

THE CHARACTERISTICS OF IMPACT DAMAGE IN GLASS/EPOXY PLATES

Thin glass/epoxy plates with 0_2/90_2/+45_2/-45_2]_s were subjected to low velocity impact. To measure the property of damage in composite,we have foundMn(CH_3COO)_2 /CH_3COCH_3 solution,The new liquild is cheaper and available and th result is very succeessful.Delay technique has been used to present the pattern of damagearea in composites and the relationship between delamination and impact energy. Experimental results have shown that there is a threshold value of impact energy and that alinear relationship holds between delamination area and impact energy.Observing themicrosopic pattern of damage area by scarining electron micrography. We have found that themattix cracks which are parallel to the fiber direction are caused by the tensile stresses andthe delamination by the shear stresses.