Journal
ADVANCED COMPOSITE MATERIALS
Volume 29, Issue 1, Pages 101-113Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09243046.2019.1651083
Keywords
thermoplastic prepreg; unidirectional composites; cooling rate; matrix residual stress; interfacial strength
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The longitudinal and transverse strength of three unidirectional thermoplastic prepreg systems: carbon fiber/polypropylene (CF/PP), polyamide 6 (CF/PA6), and polyphenylene sulfide (CF/PPS) are studied and analytical formulas are proposed for the estimation of matrix and fiber/matrix interface properties from composites properties. Since the matrices are semi-crystalline thermoplastics, the influence of cooling rate on the strength is statistically evaluated. While the 0o tensile strength is found to be independent of the cooling rate, the 90o tensile strength is strongly influenced by the matrix type and cooling rate. The matrix modulus increases as the cooling rate is decreased; the degree of crystallinity also increases. The matrix residual stress, interfacial shear strength, and mode II interlaminar fracture toughness are also found to depend on the cooling rate, with the trends different for different matrices.
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