Chemical functionalization of composite surfaces for improved structural bonded repairs

被引：31

作者：

Joelly, Ines ^{[1
]}

Schloegl, Sandra ^{[1
]}

Wolfahrt, Markus ^{[1
,2
]}

Pinter, Gerald ^{[3
]}

Fleischmann, Martin ^{[2
]}

Kern, Wolfgang ^{[1
,3
]}

机构：

[1] Polymer Competence Ctr Leoben GmbH, A-8700 Leoben, Austria

[2] FACC Operat GmbH, A-4973 St Martin Innkreis, Austria

[3] Univ Min & Met Leoben, A-8700 Leoben, Austria

来源：

COMPOSITES PART B-ENGINEERING | 2015年 / 69卷

关键词：

Adhesion; Fracture toughness; Joints; Surface treatments; Carbon-fiber reinforced polymers; AIRCRAFT STRUCTURE; ADHESIVE JOINTS; SCARF REPAIRS; LAP JOINTS; POLYMERS; COATINGS; STRESSES; DESIGN;

D O I：

10.1016/j.compositesb.2014.10.020

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In terms of lightweight design, aerodynamics and structural integrity, bonded repairs represent the preferred approach for repairing composite structures in aircraft applications. In this work the influence of crucial surface parameters including roughness, polarity and chemical composition on the performance of bonded repairs is studied. Besides mechanical and physical interactions, the study aims at the surface modification of carbon-fiber reinforced polymers (CFRP) to tailor chemical interactions with the adhesive. Reactive epoxy and mercapto derivatives are attached onto the CFRP surface by a 2-step functionalization route to ensure optimized adhesion and covalent bonding to epoxy-based adhesives. The performance of bonded coupon joints is determined by single lap shear tests (tensile-shear loading) and fracture mechanical tests (mode I loading). The results give evidence that chemical interactions play a key role in the quality of bonded repair systems. By controlling the chemical surface properties improved bond strength, homogenous crack growth and cohesive failure patterns are achieved. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：296 / 303

页数：8

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