The effects of cure pressure on resin flow, compaction, void content, and mechanical properties of fiber reinforced composites were investigated. Tests were performed on lami nates made of Fiberite T300/976 and T300/934 unidirectional prepreg tape. Data are pre sented on compaction, resin flow, and void content which lend support to the validity of the Springer-Loos model. Data are also given showing the effects of cure pressure on void content and on the compressive strength and short-beam shear strength and modulus.

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Using data generated by a differential scanning calorimeter, the heat of reaction, the rate of cure, and the degree of cure of Fiberite 976 resin were determined at the constant temperatures of 413, 423, 433, and 443°K (isothermal scanning). The ultimate heat of reaction was also measured at the constant heating rate of 2°K/min (dynamic scanning). Using a disc and plate type viscometer, the viscosity was measured as a function of time at the temperatures of 413, 423, 433, and 443°K. Expressions were also developed which represent the rate of cure, the degree of cure, and the viscosity data.