Table of Contents
Journal of Composites
Volume 2014 (2014), Article ID 329153, 12 pages
http://dx.doi.org/10.1155/2014/329153
Research Article

Validating the Classical Failure Criteria for Applicability to the Notched Woven-Roving Composite Materials

Department of Mechanical Engineering, Faculty of Engineering, Alexandria University, El-Horreya Avenue, El-Hadarra, Alexandria 21544, Egypt

Received 25 August 2013; Revised 9 February 2014; Accepted 11 February 2014; Published 24 March 2014

Academic Editor: Baozhong Sun

Copyright © 2014 Mohamed Mostafa Yousef Bassyouny Elshabasy. 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.

Abstract

The classical failure criteria are phenomenological theories as they ignore the actual failure mechanism and do not concentrate on the microscopic events of failure. The main objective of the current investigation is to modify the classical failure theories to comprise the essential failure mechanism (interfacial shear failure) in the thin-layered woven-roving composite materials. An interfacial shear correction factor (MH6) is introduced into the nondimensional shear terms in the studied classical failure criteria. Thus the validity of applying these theories to the investigated material will be augmented. The experimental part of the current study is conducted on thin-layered circular specimens. The specimens are fabricated from two plies of fiber E-glass woven-roving fabric reinforced with polyester. The fabrics are laid to have [ 45°] or [0°, 90°] fiber orientation. The specimens used are plain, where no macroscopic sources of stress concentration exist or having circular notches of five, seven, or nine mm radii. The specimens are subjected to low cycle completely reversed fatigue bending loading where the S-N and the R.D.-N curves are plotted for each group of specimens.