An experimental-analytical program was conducted to investigate the effect of different variables on the measured value of KISCC from the DCB test. Crack length evolution for different test conditions, i.e. different specimen thickness and initial arm displacement, was experimentally determined. Tests to determine the growth vs. no growth conditions in terms of the initial Kapplied were also conducted. The experimental results together with the characteristics of the electrochemical evolution of the solution-surface system, were used to feed a computer program previously developed, capable of predicting crack length evolution with time, and hence the instantaneously Kapplied, and finally the KISCC. The results seem to indicate that for a given material, the KISSC dependence on Kapplied could be explained in terms of the change of the subsurface concentration with time.

Subject
Test methods, Crack growth, Materials, Hydrogen concentration, Geometry, Crack propagation, Stress cracking, Stress, Constants, Crack velocity, Crack length, Sulfide stress cracking, Cracks
Keywords:
Sour environment, Sulfide stress cracking, Double Cantilever Beam, Specimen geometry, Crack growth, Stress intensity factor
© 2005 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2005
Association for Materials Protection and Performance (AMPP)
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