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对芳纶纤维增强聚合物(AFRP)片材、碳纤维增强聚合物(CFRP)片材以及配套的环氧胶黏剂在60、80、100、120、140次冻融循环后的力学性能进行试验研究,并对两种片材的抗冻融性能进行对比.试验结果表明:冻融循环后,AFRP片材拉伸性能的变化幅度总体上大于CFRP片材,展现出相对更弱的抗冻融性能;冻融循环140次后AFRP片材的抗拉强度和弹性模量分别较未冻融时降低8.2%和14.0%,而冻融循环140次后CFRP片材的弹性模量却与未冻融时基本相当,冻融循环60次后CFRP片材的抗拉强度降低6.1%,但在接下来的冻融循环后基本保持稳定或略有增长;冻融循环后,AFRP片材和CFRP片材的断裂伸长率均与未冻融时基本相当或有所偏高,但AFRP片材的变化幅度相比CFRP片材略大;冻融循环140次后,环氧胶黏剂的拉伸剪切强度无退化.
The mechanical properties of aramid fiber-reinforced polymer (AFRP) sheet, carbon fiber reinforced polymer (CFRP) sheet and associated epoxy adhesive after 60, 80, 100, 120, 140 freeze- thaw cycles were tested The results show that after the freeze-thaw cycles, the tensile properties of AFRP sheets are generally larger than that of CFRP sheets, showing a relatively weaker freeze-thaw resistance The tensile strength and elastic modulus of AFRP sheet decreased by 8.2% and 14.0% respectively after 140 cycles of freeze-thaw cycles, while the elastic modulus of CFRP sheet after freezing and thawing cycles was 140% After 60 cycles of freezing and thawing, the tensile strength of CFRP sheet decreased by 6.1%, but remained stable or slightly increased after the freeze-thaw cycle. After freeze-thaw cycles, the AFRP sheet and CFRP sheet The elongation at break of the material was almost the same as or slightly higher than that of the non-freeze-thawed paper, but the change range of AFRP sheet was slightly larger than that of CFRP sheet. After 140 cycles of freeze-thaw cycle, the elongation of epoxy adhesive Shear strength without degradation.