Publisher DOI: 10.1016/j.compscitech.2014.07.010
Title: Evaluation of a critical impact energy in GFRP under fatigue loading
Language: English
Authors: Kosmann, Nils 
Riecken, Björn Thorge 
Schmutzler, Henrik 
Knoll, J. B. 
Schulte, Karl 
Fiedler, Bodo  
Keywords: A. Glass fibres; A. Textile composites; B. Fatigue; B. Impact behaviour; E. Resin transfer moulding (RTM)
Issue Date: 18-Jul-2014
Publisher: Elsevier
Source: Composites Science and Technology 102: 28-34 (2014-10-06)
Abstract (english): 
Defects in fibre reinforced polymer structures, such as impact damages, have a major influence on the fatigue behaviour. Impacts may occur during the lifetime of composite structures and lead to delaminations between adjacent layers with different fibre orientations and to matrix cracks within the layers. Specimens made of a glass fibre non crimp fabric were produced by vacuum assisted resin transfer moulding. Low velocity impact damage was introduced by use of a drop weight with a hemispherical head. The specimens were tested under fatigue loading with a stress ratio of R= -1 (tension-compression). The aim was to characterise damage development in fatigue testing of fibre reinforced polymers as a function of impact energy, lifetime and stress level. Therefore, the stiffness degradation during fatigue testing due to matrix cracks, delaminations, fibre failure and temperature development of the specimens was plotted vs. the number of load cycles. In interrupted fatigue tests with defined numbers of load cycles the influence of impact damages on matrix crack development was determined and correlated with stiffness degradation. Furthermore, thermoelastic stress analysis was performed during the interrupted tests in order to determine stress concentrations in the area of impact damage.
ISSN: 1879-1050
Journal: Composites science and technology 
Institute: Kunststoffe und Verbundwerkstoffe M-11 
Document Type: Article
More Funding information: The authors are grateful to the German Research Foundation (DFG) for supporting this work as part of the project SCHU 926/16-2 within PAK267.
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