AE法による短繊維強化PETの破壊機構に関する研究 : 切欠き長さと繊維含有率の影響

概要

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Effects of notch length and fiber content on the tensile fracture behavior of short fiber reinforced polyethylene terephthalate (FRPET) are studied using the acoustic emission (AE) method. The cumulative AE event count and the total AE energy increase with increases in the notch length. The total AE energy decreases with increases in the fiber content, but the cumulative AE event count has a maximum value at a fiber content by volume of 17.3%. The log-log plot of the relationship between the total AE energy and the stress intensity factor has two broken points at Kb and KC which correspond to the changes in failure mode, respectively. The ratios of P_b/P_<max> are varied, and P_c/P<max> values are roughly constant at the various notch lengths and fiber contents, where the P_b and P_c are loads determined by K_b and K_c, and P_<max> is the maximum load. The relationship between the damage state at the notch tip and the AE frequency spectrum determines the fracture mechanisms of FRPET at the applied loads of P_b/P_<max> and P_c/P_<max>.
社団法人日本機械学会の論文
1992-09-25