Anisotropic strain rate effects on the fibre–matrix interface decohesion in sheet moulding compound composites

摘要: Abstract Material and structure overall response vary significantly under rapid strain as compared to quasi-static loading. The rate sensitivity of a discontinuous fibre-reinforced composite was investigated. material consists in sheet moulding compound (SMC-R26: weight content 26%) with randomly oriented reinforcement. specific aim this study is develop multi-scale analyzed methodology order understand the physical origin effect. To task, using servo-hydraulic machine, monotonic interrupted tensile tests were performed at different rates over range from 2 × 10−4 2 × 102 s−1 coupled scanning electronic microscope observations. obtained results macroscopic microscopic scale, have shown that SMC-R26 presents visco-damageable behaviour: damage onset kinetic are widely sensitive rate, whereas load effect, if any, insignificant on elastic properties. It has been established governed by fibre–matrix interface failure strength which increases when increasing rate. Moreover, through analysis fibre orientation influence, we demonstrated effects (a delayed slightly reduced accumulation kinetic) more important interfaces submitted pure normal stress.