Improving the structural properties and damage tolerance of bonded composite joints using z-pins

The effect of z‐pin reinforcement on the structural properties and damage tolerance of composite joints is experimentally studied in this article. The ultimate load, failure strain, and absorbed energy capacity of carbon fiber‐epoxy T‐joints and single lap joints increased rapidly with the volume co...

Full description

Saved in:

Bibliographic Details
Published in:	Journal of composite materials Vol. 46; no. 26; pp. 3255 - 3265
Main Authors:	Koh, TM, Isa, MD, Chang, P, Mouritz, AP
Format:	Journal Article
Language:	English
Published:	London, England SAGE Publications 01-12-2012 Sage Publications
Subjects:	Applied sciences Bonded joints Composites Cracks Damage tolerance Delaminating Exact sciences and technology Forms of application and semi-finished materials Fracture mechanics (crack, fatigue, damage...) Fundamental areas of phenomenology (including applications) Interlaminar Lap joints Physics Polymer industry, paints, wood Solid mechanics Static elasticity (thermoelasticity...) Structural and continuum mechanics Technology of polymers Tee joints Traction Damage tolerance z-pins joints mechanical properties Lap joint Strain energy Solid solid interface Fiber reinforced material Rupture Z shape Ultimate limit Mechanical joint Fastener Experimental study T joint Crack propagation Crack bridging Carbon fiber reinforced plastics Energy absorption Delamination Ultimate load Damaging Carbon fiber Crack
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	The effect of z‐pin reinforcement on the structural properties and damage tolerance of composite joints is experimentally studied in this article. The ultimate load, failure strain, and absorbed energy capacity of carbon fiber‐epoxy T‐joints and single lap joints increased rapidly with the volume content of z‐pins. The improvement to these properties was due to the capacity of z‐pins to resist unstable (rapid) delamination growth along the bonded region to the T‐joints (induced by interlaminar mode I stress) and lap joints (induced by interlaminar mode II stress) by forming a crack bridging traction zone. Large increases to the damage tolerance of T‐joints and lap joints containing pre‐existing bond‐line cracks were also achieved by z‐pins. The z‐pins formed a bridging traction zone across the delaminated bond‐line which retained high strength in the joints, even in the presence of very long cracks which severely weakened conventional joints.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0021-9983 1530-793X
DOI:	10.1177/0021998312437233