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International Journal of Aerospace Engineering
Volume 2014, Article ID 829698, 12 pages
Research Article

Influence of Root Rotation on Delamination Fracture Toughness of Composites

1Faculty of Mechanical Engineering, Sardar Raja College of Engineering, Alangulam, Tirunelveli 627808, India
2Faculty of Mechanical Engineering, Government College of Engineering, Tirunelveli 627007, India
3Faculty of Mechanical Engineering, School of Mechanical and Civil Sciences, KL University, Green Fields, Vaddeswaram 522502, India

Received 20 May 2014; Revised 11 September 2014; Accepted 25 September 2014; Published 20 October 2014

Academic Editor: Nicolas Avdelidis

Copyright © 2014 V. Alfred Franklin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Large deviations have been observed while analysing composite double cantilever beam (DCB) specimens assuming each cracked half as a simple cantilever beam. This paper examines the effect of rotational spring stiffness on the critical fracture energy considering nonzero slope at the crack-tip of the DCB specimen by modelling each cracked half as the spring-hinged cantilever beam. The critical load estimates of DCB specimens from are found to be in good agreement with in-house and existing test results of different composite material systems.