Intraply crack and delamination interaction in laminate beams under transverse loading

摘要: Abstract Intraply cracking and delamination are the basic modes of damage in composite laminates their interaction constitutes an important phase development. Such is investigated present work through a two-dimensional finite element analysis three-point bending beam model. This configuration considered to embody characteristics lowenergy transverse impact laminates, where major concern. Interleaves incorporated model evaluate role process. The stacking sequence used [0/A/90/A/0] (‘A’ denotes interleaf), intraply crack at 45° loading line assumed central 90° ply. process simulated by specifying growth tips along axis direction. Stress fields strain energy release rates evaluated different stages growth. results show that before any takes place, there significant normal stress concentration crack. Consequently, strong involvement mode I component fracture this stage. However, with delamination, rapid transition occurs which its corresponding driving force decrease dramatically relative shear counterparts. entire therefore summarized as primarily II dominated event preceded very limited period driven initiation also indicate soft interleaves do not alleviate forces front. It follows interleaf technology relies almost entirely on toughness interleaves.