Cohesive Law Estimation in Mode II of a Ductile Adhesive
Keywords:
adhesive joints, finite element method, cohesive zone models, fracture toughness, direct methodAbstract
Modern and competitive structures are sought to be strong, reliable and lightweight, which increased the industrial and research interest in adhesive bonding. Cohesive Zone Models (CZM) are a powerful analysis tool, although the CZM laws of the adhesive bond in tension and shear are required as input in the models. This work evaluated the value of shear fracture toughness (GIIC) and CZM law of bonded joints. The experimental work dealt with the shear fracture characterization of the bond by conventional and J-integral techniques. By the J-integral technique, the precise shape of the cohesive law is defined. For the J-integral, a digital image correlation method is used for the evaluation of the adhesive layer shear displacement at the crack tip (ds) during the test, coupled to a Matlab® sub-routine for the extraction of this parameter automatically. As output of this work, fracture data is provided in shear for the selected adhesive, allowing the subsequent strength prediction of bonded joints.
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Papers accepted for publication become the copyrighted property of the Annals of "Dunarea de Jos" University of Galati, Fascicle XII, Welding Equipment and Technology. No part of the publication may be reproduced or transmitted in any form, or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, except in limited quantities for the non-commercial purposes of scientific or educational advancement, without permission in writing from the Editorial Board.
