深水静压环境中夹芯结构PUEPM芯材蠕变特性实验研究

摘要

通过弹性力学分析,将深水静压环境中夹芯结构芯材力学状态与加套筒静压实验中芯材的力学状态进行对比,提出研究深水静压环境中夹芯结构黏弹性芯材蠕变特性的套筒实验方法；针对三种不同配方的聚氨酯改性环氧基微珠增强吸声体(Polyurethane Modified Epoxy Resin Sound Absorption Materials,PUEPM)芯材开展准静态套筒压缩实验和加套筒蠕变实验,得到了芯材的蠕变性能.结果表明:玻璃微珠含量较低,短切纤维含量较高的分层PUEPM芯材具备较好的蠕变性能；玻璃微珠含量越大,芯材变形回弹性能越好；B型PUEPM芯材具备较好的综合力学性能.%According to the elasticity theory, comparing the core material mechanical states in the sleeve under static pressure and the core mechanical states in the sandwich structure under deep water static pressure environment, the bushing test method adapted to study the creep characteristics of vis-coelastic core materials was presented. The quasi-static compression and bushing compression creep tests for three different microspheres-reinforced polyurethane-modified epoxy resin sound absorption materials (PUEPM) were carried out, the creep behavior of the core materials was obtained. The results show that the delaminated PUEPM core with low content glass microsphere and high content chopped fiber has preferable creep performance. The PUEPM core with higher content glass micro-sphere has higher resilience performance. The PUEPM core of type B has better comprehensive mechanical properties.