Pseudo-ductile hybrid composites usually require thin plies. In contrast, in the present paper unidirectional fibre-hybrid composites with conventional ply thicknesses are investigated. A prepreg with DIALEAD fibres and a 0.22 mm thickness was used as the high-modulus/low-elongation (LE) layer, combined with a prepreg with T800 fibres and a 0.11 mm thickness as the intermediate modulus/high-elongation (HE) layer. For hybrids with an LE volume fraction of 33% and below, pseudo-ductile behaviour in tension was obtained. The hybrid with an LE volume fraction of 50% has shown a transitional behaviour, mixing pseudo-ductility with a sharp stress drop after the failure of LE layer. The fracture mechanisms were interpreted using edge optical observation, full-field registration of the surface strain maps and analysis of the amplitude and frequency of acoustic emission signals. The pseudo-ductility was caused by the stable, progressive delamination of the LE/HE interface.

伪延性混合复合材料通常需要薄层。相反，在本文中，研究了具有常规层厚度的单向纤维混合复合材料。将具有DIALEAD纤维和0.22毫米厚度的预浸料用作高模量/低伸长率（LE）层，将具有T800纤维和0.11毫米厚度的预浸料用作中间模量/高伸长率（HE）层。对于LE体积分数为33％或以下的杂种，在张力下获得了假延性行为。LE体积分数为50％的杂化体表现出过渡行为，在LE层失效后混合了假延性和急剧的应力下降。使用边缘光学观察解释了断裂机理，表面应变图的全场配准以及声发射信号的幅度和频率分析。假延展性是由LE / HE界面稳定，逐渐分层引起的。