AE法による損傷したFRPAの破壊機構と損傷評価

概要

論文の詳細を見る
The fracture mechanisms and the damage rate of fatigue-damaged FRPA specimens are estimated by analyzing the AE signals detected during the tensile test.The loads P_i, P_b and P_c in change of the damage machanisms are determined by applying the AE energy gradient method to the nondamaged and the damaged specimens.It is found by AE frequency analysis at the loads that the damage mechanisms for nondamaged specimen are dominated by the fiber breaking, but the damage mechanisms at the lower ratio of N/N_f for the damaged specimens are dominated by the fiber debonding, the damaged mechanisms at the higher ratio of N/N_f are dominated by the fiber beraking and the damage modes at more higher ratio of N/N_f are changed by stress amplitude, where N is the number of cycles and N_f is the number of cycles to failure.It is also found by the relation between the ratio of load P/P_(N)and the ratio of number of cycles N/N_f that the damage rate 1-P_i/P_i(N) is estimated higher than the damage rates 1-P_b/P_b(N)and 1-P_max/P_max(N), where P and P_(N)are the loads in change of damage machanisms of the damaged and the nondamaged specimens, respectively.
社団法人日本材料学会の論文
2000-03-15