CFRP繊維方向の曲げ強度の時間-温度依存性 : 三点曲げ試験

概要

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To investigate the time and temperature dependences of the longitudinal flexural strength of unidirectional CFRP, three-point bending tests were conducted at various temperatures and strain rates. The longitudinal flexural strength of CFRP showed a remarkable dependence upon time and temperature. The master curve for this strength was constructed based on the thermo-rheologically simple properties. The time and temperature shift factors were quantitatively in good agreement both for the longitudinal flexural strength of CFRP and the tensile strength of matrix resin, and also coincided well with those for the creep compliances of these materials. The fracture of CFRP under three-point bending was classfied into the three modes; a) breaking on both the tension and compression sides at the loading point of specimen in the region of low temperature, b) breaking on only the compression side in the region of middle temperature and c) microbuckling of fibers on the compression side in the region of high temperature. It was found that the time arid temperature dependences of bending fracture were dominated by those of compressive fracture rather than tensile fracture.
社団法人日本材料学会の論文
1984-07-15