Tensile Tests of Carbon Fiber Composite Cables and Health Monitoring by Electrical Resistance Method

摘要

A simple tension test for CFRP 1 X 7 stranded cables have been conducted under both rotation-free and rotation-fixed conditions. The relationship between the tensile properties of CFRP cables and the end conditions of the specimen were investigated. It was found out that tensile strength of CFRP cable decreased according to the increase of the angle of untwist in these tests. The relationship between the resistance change of the fiber direction and the elongation of unidirectional carbon fiber composites has already been reported. In this tensile test, the resistance of the strand (core and side wires) of CFRP cable along the fiber direction and AE signal were measured and the propagation of damage of the CFRP was monitored and examined by the non-destructive method. From the test results, the relationship between load and resistance change and AF behavior was investigated until the CFRP cable failed. Data for damage evaluation of CFRP cable by the non-destructive method under tensile loading was obtained.