Analysis of tensile preloaded composites subjected to low-velocity impact loads

摘要

Composite Materials are being used increasingly in aircraft structures due to their high specific strength, stiffness, and the resultant weight savings. Traditionally, the uses of graphite fiber-reinforced composites have been confined to secondary structures. However, requirements for reduced structural weight, improved aircraft performance, and efficiency are making the composite materials increasingly competitive for expanded usage in the primary, load carrying structures. past experiences and experiments have confirmed that the graphite fiber-reinforced composite laminates have low ultimate strains, no plastic deformation range, and no usable strength in the thickness direction. These limitations become obvious when laminates are subjected to impact loads.