Experimental Results in Support of Simulating Progressive Crush in Carbon-Fiber Textile Composites

DeTeresa, S J ; Allison, L M ; Cunningham, B J ; Freeman, DC ; Saculla, M D ; Sanchez, R J ; Winchester, S W

Lawrence Livermore National Laboratory

关键词: Tensile Properties;    Compression;    Esters;    Elongation;    Carbon Fibers;   

DOI  :  10.2172/15005998
RP-ID  :  UCRL-ID-143287
RP-ID  :  W-7405-ENG-48
RP-ID  :  15005998

美国|英语

来源: UNT Digital Library

【 摘 要 】

This report summarizes the findings of an experimental program conducted to support the modeling of the crush behavior of triaxial braid carbon fiber composites. The matrix material as well as braided panels and tubes were characterized in order to determine material properties, to assess failure modes, and to provide a test bed for new analytical and numerical tools developed specifically for braided composites. The matrix material selected by the ACC was an epoxy vinyl ester (Ashland Hetron 922). Tensile tests were used to compare two formulations-one used by the ACC and one recommended by the resin supplier. The latter was a faster reacting system and gelled in one-third the time of the ACC formulation. Both formulations had an average elongation at failure that was only half of the resin supplier's reported value. Only one specimen of each type came close to the reported elongation value and it was shown that failure invariably initiated at both surface and internal defects. Overall, the tensile properties of the two formulations were nearly identical, but those of the ACC system were more consistent. The properties of the ACC matrix formulation were measured in tension, shear, and compression and the average properties obtained in these tests are summarized.