Determination of residual strength in notched APC-2 cross-ply composite laminates at elevated temperature

The residual strength of notched AS-4/polyetheretherketone (PEEK) composite (APC-2) laminates with a central hole at elevated temperature was systematically investigated by both analytical and empirical methods. First, APC-2 cross-ply [0/90]4s panels were fabricated and cut into samples. A circular...

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Bibliographic Details
Published in:Journal of composite materials 2012-07, Vol.46 (14), p.1705-1713
Main Authors: Jen, Ming-Hwa R, Sung, Yi-Chun
Format: Article
Language:English
Subjects:
Applied sciences
Composites
Empirical analysis
Exact sciences and technology
Forms of application and semi-finished materials
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
High temperature
Laminates
Mathematical analysis
Mathematical models
Panels
Physics
Polyetheretherketones
Polymer industry, paints, wood
Residual strength
Solid mechanics
Static elasticity (thermoelasticity...)
Structural and continuum mechanics
Technology of polymers
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Summary:The residual strength of notched AS-4/polyetheretherketone (PEEK) composite (APC-2) laminates with a central hole at elevated temperature was systematically investigated by both analytical and empirical methods. First, APC-2 cross-ply [0/90]4s panels were fabricated and cut into samples. A circular hole with one of five diameters was drilled in the center of each sample. The samples were subjected to quasi-static tensile tests at elevated temperatures to measure their mechanical properties – strength and longitudinal stiffness. Stress concentration and high temperature were found to remarkably affect the residual strength of composite. Point stress criterion (PSC) above was found to be unsatisfactory in predicting the residual strength. A modified PSC combined with the equation of thermal degradation was able to predict the characteristic length at elevated temperature. The residual strengths predicted by the extended modified PSC model were in very close agreement with the empirical data.
ISSN:0021-9983
1530-793X
DOI:10.1177/0021998311423859