PIEZORESISTIVITY AND FAILURE OF CARBON FILAMENTS IN AXIAL-COMPRESSION

被引:29
作者
DETERESA, SJ
机构
[1] University of California, Lawrence Livermore National Laboratory, Livermore
关键词
CARBON FIBER; AXIAL COMPRESSION; PIEZORESISTIVE BEHAVIOR; FAILURE;
D O I
10.1016/0008-6223(91)90209-2
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A novel technique for axial compression of single carbon filaments is introduced. Single filaments were bonded to the surface of polymer compression specimens in a manner analogous to the mounting of metal-foil strain gages. By measuring the fiber piezoresistive behavior, filament compression could be monitored. In compression, the resistance of the filaments decreased nonlinearly and reached a minimum value just prior to failure. This nonlinear decrease in resistance with compression was found to be reversible up to strains of -3%. Filament failure was marked by an abrupt increase in resistance, and average ultimate compressive strains were -3% or greater for all fiber types. Because these failure strains are approximately double those measured for high-fiber-content composites in longitudinal compression, it was concluded that the compressive strength of composites fabricated from the fiber examined is not limited by the strength of the fiber and that a large potential exists to improve composite strength.
引用
收藏
页码:397 / 409
页数:13
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