Design considerations in the strengthening of composite lap joints using metal z-pins

被引：18
作者：
Ravindran, Anil R. [1 ]
Ladani, Raj B. [1 ]
Wang, Chun H. [2 ]
Mouritz, Adrian P. [1 ]
机构：
[1] RMIT Univ, Sch Engn, GPO Box 2476V, Melbourne, Vic 3001, Australia
[2] Univ New South Wales, Sch Mech & Mfg Engn, Sydney, NSW 2052, Australia
来源：
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2022年 / 160卷
关键词：
A. 3-Dimensional reinforcement; B; Strength; Debonding; D; Fractography; STRUCTURAL-PROPERTIES; MULTILEVEL ANALYSIS; FAILURE MECHANISMS; FINITE-ELEMENT; DELAMINATION; DAMAGE;
D O I：
10.1016/j.compositesa.2022.107031
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Through-thickness reinforcements are an effective technique to improve the structural properties of bonded fibre-polymer composite lap joints. However, there is a lack of understanding of the effectiveness of this tech-nique for internal step-lap joints. This study examines the strengthening effects of z-pins on different types of composite step-lap joints. Co-cured single, quadruple and multi-step lap joints made of carbon-epoxy laminate were reinforced with steel z-pins. The results reveal that z-pins were highly effective at increasing the ultimate strength (+20%) and elongation limit (+250%) of the single lap joint under tensile loading by suppressing catastrophic failure through plastic shear deformation following fracture of the co-bonded interface. However, the z-pins were less effective at improving the strength (+7.5%) and maximum strain (+18%) for the quadruple lap joint and did not provide any strengthening for the multi-step lap joint. The mutually exclusive relationship between the number of bonded interfaces and the z-pin strengthening efficacy is discussed.
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页数：7
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