微米PS环氧树脂增韧钢-CFRP界面机理及力学性能研究

摘要/Abstract

摘要： 为强化钢-碳纤维复合材料(CFRP)胶粘界面环氧树脂的强度和韧性,添加聚苯乙烯(PS)微球提升环氧树脂的力学性能。研究了常温固化工艺下微米PS增韧环氧树脂的拉伸、弯曲和冲击性能,利用扫描电子显微镜(SEM)观察了环氧树脂拉伸断面的微观形貌,分析了微米PS颗粒对环氧树脂的增强增韧机理,开展了钢-CFRP胶粘界面力学性能试验。结果表明,PS质量分数从0%增加到5.00%时,胶粘剂的拉伸强度、拉伸弹性模量、弯曲强度、弯曲模量、断裂伸长率、弯曲挠度及冲击强度随着PS掺量的增加呈先增大后减小的趋势。基体断裂时PS颗粒会产生大变形或阻碍微裂纹发展,从而达到增韧的目的,较大掺量的PS颗粒在树脂中粘附团聚导致环氧树脂的力学性能下降。随着PS掺量从0%增加到2.50%,钢-CFRP胶粘试件的破坏形态从钢板脱胶、胶层内聚破坏逐渐过渡到CFRP板层离,双搭接试件的抗拉强度逐渐提高,2.50%掺量的微米PS增韧环氧树脂在钢-CFRP胶粘界面中表现出良好的力学性能。

关键词: 聚苯乙烯, 增韧环氧树脂, 双搭接试件, 力学性能, 微观结构

Abstract: To strengthen the strength and toughness of epoxy resin at the steel-carbon fiber reinforced polymer (CFRP) adhesive interface, polystyrene (PS) microspheres were added to enhance the mechanical properties of epoxy resin. The tensile, bending and impact properties of micron PS toughened epoxy resin under normal temperature curing process were studied. The micromorphology of the tensile cross section of epoxy resin was observed using scanning electron microscope (SEM). The strengthening and toughening mechanism of micron PS particles on epoxy resin was analyzed, and the mechanical property test of the steel-CFRP adhesive interface was carried out. The results show that: the tensile strength, tensile modulus of elasticity, flexural strength, flexural modulus, elongation at break, flexural deflection and impact strength of the adhesives show a tendency to increase and then decrease with the increase of PS dosage when the mass fraction of PS increases from 0% to 5.00%. When the matrix breaks, the PS particles produce large deformations or hinder the development of microcracks, thereby achieving the purpose of toughening. The larger amount of PS particles will adhere and agglomerate in epoxy resin, resulting in a decrease in the mechanical properties of epoxy resin. As the PS content increases from 0% to 2.50%, the failure mode of the steel-CFRP bonded specimens gradually transitions from steel plate debonding and adhesive layer cohesive failure to CFRP plate delamination. The tensile strength of the double-lap specimen gradually increases, and the micron PS toughened epoxy resin with mass fraction of 2.50% shows good mechanical properties in the steel-CFRP adhesive interface.

Key words: polystyrene, toughened epoxy resin, double-lap specimen, mechanical property, microstructure

中图分类号:

TB332

陈卓异, 严子卓, 刘雁, 彭岚. 微米PS环氧树脂增韧钢-CFRP界面机理及力学性能研究[J]. 硅酸盐通报, 2024, 43(8): 3098-3108.

CHEN Zhuoyi, YAN Zizhuo, LIU Yan, PENG Lan. Interface Mechanism and Mechanical Properties of Micron PS Epoxy Resin Toughened Steel-CFRP[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(8): 3098-3108.

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