Evaluation of high-modulus pitch/cyanate material systems for dimensionally stable structures

Richard A. Brand; Eddy A. Derby

doi:10.1117/12.138006

16 September 1992 Evaluation of high-modulus pitch/cyanate material systems for dimensionally stable structures

Richard A. Brand, Eddy A. Derby

Proceedings Volume 1690, Design of Optical Instruments; (1992) https://doi.org/10.1117/12.138006
Event: Aerospace Sensing, 1992, Orlando, FL, United States

Abstract

Dimensional stability in composite structures has mainly focused on near-zero CTE, high- modulus fiber/epoxy resin systems. However, hygrothermal stability has been demonstrated to be a serious concern for structures moisturized on earth and dried in orbit. Composite sealing techniques have been developed to prevent this moisture absorption and desorption with the concomitant dimensional changes. New resin system are being developed which absorb significantly less moisture and show promise as optional systems in dimensionally stable structures. These resin systems have not been evaluated for their physical and mechanical properties. This paper describes the testing of various high-modulus, cyanate ester resin systems for evaluation in dimensionally stable composite applications. Physical testing included moisture absorption testing, coefficient of thermal expansion, and hygrothermal strain change. Mechanical testing included tensile, compression, Iosipescu shear, and bonded joint allowables. A comparison of the thermomechanical properties for the cyanate ester resin systems is made with a P75S/ERL1962 baseline epoxy resin systems.

Citation Download Citation

Richard A. Brand and Eddy A. Derby "Evaluation of high-modulus pitch/cyanate material systems for dimensionally stable structures", Proc. SPIE 1690, Design of Optical Instruments, (16 September 1992); https://doi.org/10.1117/12.138006

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