EFFECT OF SEAWATER ON HYGROSCOPICITY AND MECHANICAL PROPERTIES OF PMI FOAM SANDWICH COMPOSITES

Abstract

Abstract: With the increasing use of foam sandwich composites in the marine industry, the impact of the marine environment on the performance of foam sandwich composites remains to be explored. In this paper, the mechanism of the influence of seawater on foam sandwich composites was investigated by comparing the difference in hygroscopicity and mechanical properties of PMI foam sandwich composites with deionized water and seawater. The test results show that the saturated moisture absorption rate of PMI foam sandwich composites immersed in seawater is 5.4%, and the time required for saturation is 28 days. The saturated water absorption rate and the time required for saturation of samples immersed in deionized water are 6.9% and 30 days, respectively. Through Fick′s second law of diffusion, the diffusion coefficient of water molecules in seawater is lower than that of water molecules in deionized water. In addition, the flat compressive strength, lateral compressive strength and flexural strength of the samples immersed in deionized water are decreased by 37.78%, 16.72%, and 23.71%, respectively, while the samples immersed in seawater are decreased by 35.56%, 21.2%, and 20.63%, respectively.

Key words: PMI foam, sandwich structure, seawater, compression property, flexural strength

CLC Number:

TB332

ZHENG Guo-dong, XU Xiao-ming, LEI Juan-juan, ZHANG Jing. EFFECT OF SEAWATER ON HYGROSCOPICITY AND MECHANICAL PROPERTIES OF PMI FOAM SANDWICH COMPOSITES[J]. Fiber Reinforced Plastics/Composites, 2019, 0(9): 105-109.

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