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Behavior of notched and unnotched {[}0/+/- 30/+/- 60/90]s GFR/EPOXY composites under static and fatigue loads
Faculty
Science
Year:
2007
Type of Publication:
Article
Pages:
606-613
Authors:
Khashaba, U. A, Selmy, A. I, El-Sonbaty, I. A, Megahed, M
DOI:
10.1016/j.compstruct.2006.1
Journal:
COMPOSITE STRUCTURES ELSEVIER SCI LTD
Volume:
81
Research Area:
Materials Science
ISSN
ISI:000249256200015
Keywords :
bending fatigue, notched and unnotched, gross-section, net-section, angle-ply composites, glass fiber
Abstract:
The main objective of the present paper is to study the bending behavior of notched and unnotched angle-ply, {[}0/+/-30/+/-60/90](s), glass fiber reinforced epoxy (GFRE) composites under static and fatigue loads. Static and fatigue bending properties have been determined for notched and unnotched angle-ply specimens. For this purpose different circular notch sizes (2, 4.5, 7, 9 mm) were drilled at the specimen center. Constant-deflection bending fatigue tests were performed at zero mean stress and 25 Hz. A 15\% reduction of the initial applied moment was taken as a failure criterion. S-N diagrams for notched GFRE specimens have been constructed based on gross and net cross-section area. The results show that the ultimate bending strength of notched GFRE specimens decreased linearly with increasing notch diameter. Based on gross-section the fatigue life increases with decreasing notch size and the longer fatigue life was for the unnotched specimens. On the other hand, the S-N diagrams based on net-section indicate the insensitivity of angle-ply composites to the notch size. This is considered to be a peculiar phenomenon to composite materials. The results also show that the S-N diagrams have not any fatigue limit rigorous within 10(7) cycles. (C) 2006 Elsevier Ltd. All rights reserved.
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