Fatigue Response of Fabric-reinforced Polymeric Composites

Mechanical fatigue response of fiber-reinforced polymeric (FRP) composites is essential to better understand the durability of composite materials systems and to develop design specifications. Currently, the fatigue response of multidirectional glass composite materials is not well-understood and mu...

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Bibliographic Details
Published in:Journal of composite materials 2005-09, Vol.39 (17), p.1541-1559
Main Authors: Natarajan, Venkatakrishnan, Gangarao, Hota V. S., Shekar, Vimala
Format: Article
Language:English
Subjects:
Applied sciences
Composites
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Fatigue, brittleness, fracture, and cracks
Forms of application and semi-finished materials
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Physics
Polymer industry, paints, wood
Solid mechanics
Static elasticity (thermoelasticity...)
Structural and continuum mechanics
Technology of polymers
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Summary:Mechanical fatigue response of fiber-reinforced polymeric (FRP) composites is essential to better understand the durability of composite materials systems and to develop design specifications. Currently, the fatigue response of multidirectional glass composite materials is not well-understood and much needs to be done to understand their behavior under fatigue loading. In this study, three glass fabric FRP composite material coupons and systems are tested at constant low-amplitude fatigue loading. Experimental results show that for a given FRP material and load configuration, the energy loss per cycle due to fatigue damage is linear from about 10-90% of the fatigue life of the FRP composite material. The energy loss per cycle is determined to be a characteristic value of the constituent materials, and is found to vary with the induced fatigue strain levels by a power law. Based on the experimental results, a fatigue life prediction model is proposed, with internal strain energy as damage metric, to predict the useful life of FRP composites. The experimental and predicted fatigue lives at various strain levels are compared (S-N curves) and the model is found to be conservative.
ISSN:0021-9983
1530-793X
DOI:10.1177/0021998305051084