147. Development of structure in polyacrylonitrile-based fibers

✍ Scribed by J.S Perkins; D.B Barr; O.A King

• Publisher: Elsevier Science
• Year: 1973
• Tongue: English
• Weight: 129 KB
• Volume: 11
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(73)90483-1

✦ Synopsis

ABSTRACTS and addition of graphitized pitch produced the low thermal expansion coefficient characteristic of stress relief without filament failure, and had the highest tensile and shear strengths among several 7-D materials tested. 143. Restrained thermal expansion bebavior of ATJS and some carbon fi~r/py~~n matrix composites* B. L. Butler and J. C. Tidmore (Sanka Laboratories, Albuquerque, New Mexico). The stress generated by restrained thermal expansion of some carbon-carbon composites and ATJ-S has shown that stress relaxation can occur when the material processing temperature is exceeded. The stress relaxation was accompanied by permanent material strain which is indicative of plastic deformation. Thus the thermal response of reentry materials may be time-and temperature-dependent and should be treated accordingly.