Residual properties of notched [0/90]4S AS4/PEEK composite laminates after fatigue and re-consolidation
Journal
Composites Part B:Engineering
Journal Volume
33
Journal Issue
1
Pages
67-76
Date Issued
2002
Author(s)
Wang, C.M.
Abstract
Notch fatigue strengthening under different cyclic stress levels and elapsed number of cycles has been studied in [0/90]4S AS4/PEEK laminates. Quick and extensive 0° fiber splitting and the corresponding 90° fiber shear off were found to be the underlying causes of stress concentration alleviation. This effectively raised the residual strength of the notched laminates and increased their fatigue lives to beyond one million cycles. On the other hand, re-consolidation of fatigued specimens removed most of the internal damages and in the meantime reverses the above strengthening. Detailed study of the residual strength changes and damage development history using re-consolidation lent support to the above deductions on the notch fatigue strengthening phenomenon in [0/90]4S AS/PEEK laminate. © 2002 Elsevier Science Ltd. All rights reserved.
Type
journal article