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Experimental and numerical evaluation of the mechanical behaviour of GFRP sandwich panels

机译：GFRP夹芯板力学性能的实验和数值评估

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摘要

This work deals with the analysis of the mechanical behaviour of a class of sandwich structures widely employed in marine constructions, constituted by fiber-glass laminate skins over PVC foam or polyester mat cores. In detail, a systematic experimental study and numerical simulations have shown that the theoretical prediction of the strength and the actual failure mechanism of these sandwich structures can be affected by significant errors, specially in the presence of prevalent shear loading. Moreover, because of the low shear stiffness and the elastic constants mismatch of the skins and core material, failure modes and strength are strongly influenced by eventual stresses orthogonal to the middle plane of the sandwich. In particular, for the sandwich structures with a PVC foam core, such a stress interaction leads to early skin-core delamination failure, whereas for those with a polyester core it leads to core shear-cohesive failure. By means of accurate non-linear simulations, accurate failure criteria, that can be used at the design stage in the presence of complex loading, have also been developed.
机译：这项工作涉及对在海洋建筑中广泛使用的一类三明治结构的机械性能的分析，该三明治结构是由PVC泡沫或聚酯毡芯上的玻璃纤维层压表皮构成的。详细地，系统的实验研究和数值模拟表明，这些夹层结构的强度和实际破坏机理的理论预测会受到重大误差的影响，特别是在普遍存在剪切载荷的情况下。而且，由于表皮和芯材的低剪切刚度和弹性常数不匹配，破坏模式和强度受到与夹层中间平面正交的最终应力的强烈影响。尤其是，对于具有PVC泡沫芯的夹层结构，这种应力相互作用会导致早期的皮芯分层失败，而对于具有聚酯芯的那些，则会导致芯剪切粘结失效。通过精确的非线性仿真，还开发出了可以在设计阶段存在复杂载荷的情况下使用的精确失效准则。

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