Improving the fracture resistance of sandwich composite T-joints by z-pinning

被引：55

作者：

Nanayakkara, A. M. ^{[1
]}

Feih, S. ^{[1
]}

Mouritz, A. P. ^{[1
]}

机构：

[1] RMIT Univ, Sch Aerosp Mech & Mfg Engn, Melbourne, Vic 3000, Australia

来源：

COMPOSITE STRUCTURES | 2013年 / 96卷

关键词：

Sandwich composites; Joints; z-Pins; Mechanical properties; FAILURE MECHANISMS; PIN REINFORCEMENT; CYCLIC TENSION; LAP JOINTS; THICKNESS; DELAMINATION; SIMULATION; STRENGTH; BEHAVIOR;

D O I：

10.1016/j.compstruct.2012.09.029

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

This paper presents an experimental and analytical study into the strengthening and toughening of sandwich composite joints by z-pinning. Cleats connecting the vertical stiffener and horizontal base panel to T-shaped sandwich joints were reinforced in the through-thickness direction with pins. Tensile (stiffener pull-off) tests revealed that pinning increased the ultimate fracture load and fracture energy by resisting crack growth along the cleat-skin and skin-core interfaces, which were the weakest points in the unpinned joint. The peak fracture load and fracture energy increased with the volume content of z-pins. The strengthening and toughening effect of the pins was analysed using multiple pin pull-out tests performed on the sandwich composite material. It is shown that elastic deformation, debonding and pull-out of the pins from the face skins to the sandwich composite is the primary toughening mechanism of the pinned T-joints. The pin pull-out process, which is the cause for the high strengthening and toughening of the T-joints, is analysed using bridging traction modelling. (c) 2012 Elsevier Ltd. All rights reserved.

引用

页码：207 / 215

页数：9

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