5 Werkstofftechnik
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- 5 Werkstofftechnik (1) (entfernen)
The mechanical properties of three thermoplastic prepreg systems: fiber/polypropylene (CF/PP), polyamide 6 (CF/PA6), and polyphenylene sulfide (CF/PPS) are studied and analytical formulas introduced for the extraction of matrix and interface properties from composites. Since an semi-crystalline thermoplastic matrix is sensitive to crystallization, the influence of cooling rate on strength is statistically evaluated. While the 0° tensile strength is independent of the cooling rate, the 90° tensile strength is strongly influenced by the matrix type and cooling rate. The matrix modulus increases as the cooling rate becomes lower; the degree of crystallinity also increases. The matrix residual stress, interfacial shear strength, and mode II interlaminar fracture toughness are also dedenpent on the cooling rate, with the trends different for different matrices.