Stress relaxation effect on fatigue life of biaxial prestressed woven E-glass/polyester composites

In this study, the stress relaxation effect on the fatigue cycles-to-failure of the biaxial elastic fibre prestressed woven composite (E-glass/polyester) was investigated. The fibre pretension load was applied prior and during matrix cure, and then it has been released to induce compressive residual...

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Bibliographic Details
Published in:Mechanics of time-dependent materials 2019-11, Vol.23 (4), p.497-507
Main Author: Mostafa, Nawras H.
Format: Article
Language:English
Subjects:
Axial stress
Characterization and Evaluation of Materials
Classical Mechanics
Compressive properties
Engineering
Fatigue failure
Fatigue life
Glass fibers
Polyester resins
Polymer Sciences
Prestressing
Residual stress
Solid Mechanics
Stress relaxation
Woven composites
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Summary:In this study, the stress relaxation effect on the fatigue cycles-to-failure of the biaxial elastic fibre prestressed woven composite (E-glass/polyester) was investigated. The fibre pretension load was applied prior and during matrix cure, and then it has been released to induce compressive residual stresses within the matrix. The longevity of these stresses is questionable, and it needs investigation. The time of residual stress redistribution or relaxation was estimated experimentally for the E-glass fibre prestressing level be equal to 50 MPa. Residual stresses within the polyester matrix have declined by (27%) throughout 110 days leading to reduce the improved fatigue life by about 14% due to the stress relaxation process within the polyester matrix material. The study showed that even though the stress relaxation in the matrix reduced the improved fatigue cycles of the biaxial elastic prestressed E-glass fabric/polyester resin system, some improvement still is possible for long-term performance.
ISSN:1385-2000
1573-2738
DOI:10.1007/s11043-018-09402-z