Viscoelastically prestressed polymeric matrix composites (VPPMCs) are produced by subjecting fibres to tensile creep, the creep load being released prior to fibre moulding. Following matrix curing, the viscoelastically recovering fibres generate compressive stresses within the matrix which, from previous studies, can improve mechanical properties by up to 50%. This paper reports on the first study of thin flat-plate VPPMCs, using nylon 6,6 fibre-polyester resin to form cross-fibre composite plates (CCPs) with 0°/90° fibre layers and randomly distributed discontinuous fibre plates (RCPs). Drop-weight impact testing was performed on CCPs with impact velocities of 1.9 – 5.8 m/s and, compared with (unstressed) control samples, VPPMC damage depth was reduced by up to 29%; however, this difference decreased with impact velocity, indicating little improvement above 7.7 m/s. RCPs, tested at 3.0 m/s, showed a ∼30% reduction in VPPMC damage depth, compared with ∼20% for CCPs, but with no changes in debonded area.

粘弹性预应力聚合物基复合材料（VPPMC）是通过使纤维经受拉伸蠕变而产生的，蠕变载荷在纤维成型之前被释放。基质固化后，粘弹性恢复的纤维在基质内产生压应力，根据先前的研究，该压应力可以将机械性能提高多达50％。本文报道了对薄平板VPPMC的首次研究，该研究使用尼龙6,6纤维聚酯树脂形成具有0°/ 90°纤维层的交叉纤维复合板（CCP）和随机分布的不连续纤维板（RCP） 。在冲击速度为1.9 – 5.8 m / s的CCP上进行了落锤冲击测试，与（未加应力的）对照样品相比，VPPMC的破坏深度降低了29％。但是，这种差异随着冲击速度而减小，表示在7.7 m / s以上的速度几乎没有改善。以3.0 m / s的速度进行测试的RCP，显示出VPPMC损伤深度降低了约30％，而CCP则降低了约20％，但剥离面积没有变化。