波纹腹板增强泡沫夹芯复合材料结构准静态压缩吸能特性

ENERGY-ABSORPTION PROPERTIES OF CORRUGATED WEB REINFORCED FOAM CORE SANDWICH COMPOSITES UNDER QUASI-STATIC COMPRESSION

随着车船运输量与日俱增,由此引发的车船撞击结构物的事故频发,造成严重的生命财产损失与结构破坏,亟需为桥梁等结构物设置防护吸能装置。该文提出了一种新型波纹腹板增强泡沫夹芯复合材料吸能结构。该复合结构以聚氨酯泡沫为芯材,玻璃纤维增强复合材料(Glass fiber reinforced polymer,简称GFRP)为面板,在波纹型泡沫的间隙铺设双轴向玻璃纤维布,利用真空导入工艺成型。通过波纹腹板增强泡沫夹芯复合材料结构的准静态压缩试验,研究了波纹腹板与面板壁厚以及波长对夹芯结构破坏模式、承载能力以及吸能特性的影响。试验结果表明:腹板壁厚较大、波长较短的试件吸能效果最优。此外,对试验工况进行了有限元数值模拟,分析了腹板壁厚与泡沫密度因素对试件承载力的影响,为其在防撞领域的应用提供一定依据。

With the increasing numbers of ships and transportation,accidents about collision between vehicles and structures happened,causing the loss of life and property with serious structural damages.It was urgent to install energy-absorption devices for bridges and other structures.A novel type of energy-absorption structure of corrugated web reinforced foam sandwich composite is presented.The composite structure is made up of corrugated foam core materials with biaxial glass fibre reinforced polymer(GFRP)laying in the foam gap and GFRP face sheets by a vacuum assisted resin infusion molding process.Quasi-compression tests were carried out on the corrugated web reinforced foam sandwich composite structure to study the influence of the thickness of the web,of the face sheets and of wavelength on the failure modes,on the load-bearing capacities and on the energyabsorption of specimens.The test results indicated that the specimens with great web thickness and short wavelength were better to absorb energy.In addition,the finite element method was used to simulate the influence of the thickness of the web and the density of foam on the specimens and provided a valuable reference for its application in the anti-collision field.