Fracture morphology and deformation characteristics of repeatedly impacted thermoplastic matrix composites
MATERIALS & DESIGN, vol.30, no.3, pp.628-634, 2009 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 30 Issue: 3
- Publication Date: 2009
- Doi Number: 10.1016/j.matdes.2008.05.042
- Journal Name: MATERIALS & DESIGN
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.628-634
- Keywords: Impact and ballistic, Composite: polymer matrix, Scanning electron microscopy, CARBON FIBRE/EPOXY COMPOSITES, LOW-VELOCITY IMPACT, LOW-ENERGY IMPACT, DAMAGE, BEHAVIOR, FAILURE
- Kocaeli University Affiliated: Yes
Abstract
Deformations of thermoplastic matrix composites during impact fatigue loading were investigated by instrumented impacts tester and scanning electron and optic microscopy (SEM). Curves of damage evolution against the number of repeated impacts to fracture the composites revealed three distinct zones: fibre micro buckling and shear fracture of fibres (1st region), initiation and propagation of delaminations and matrix deformations (2nd region), propagation of delaminations and fibre cracking and pull out especially in tensile area (3rd region). Intensive deformations observed primarily in compression region during impact-fatigue loading can be explained by lower compressive strength of composites compared to their tensile strength. (C) 2008 Elsevier Ltd. All rights reserved.