ガラス繊維強化プラスチック (GFRP) の R 曲線法による破壊じん性の解析

概要

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Three kinds of unsaturated polyester resins having different toughness were used as the matrix of GFRP and their influences on the fracture toughness of GFRP were invetigated. The crack propagation behaviour in a mat-GFRP could be classified into three categories : Region I with a linear relationship between load and crack opening displacement, without any crack propagation and damage initiation in the vicinity of crack tip ; Region II with stable crack propagation, accompanied by fiber pull out or breakeage near the crack ; Region III with rapid unstable crack propagation and load dropping after reaching its maximum load. The fracture toughness values, K_i and K_<max>, which are related to the stable and unstable crack propagation respectively, did not depend on the ratio of initial crack size to the width of specimens, a_0/W. Therefore, it is reasonable to consider them as material properties. The K_i value, different from the K_<max> value, was dependent on the fracture toughness of the matrix resins. This suggests that the fracture toughness, related closely to tbe stable crack propagation or the initiation of damage in the GFRP, is mainly affected by the fracture toughness of the matrix resins, while the final fracture related to the K_<max> value of GFRP is deternined by the glass fiber.
社団法人日本材料学会の論文
1992-11-15