ポリカーボネートおよびポリ塩化ビニルにおけるき裂からのクレイズ成長

Abstract

Craze growth from a crack tip is an interesting problem in connection with delayed crack growth. When subjected to some stress in a certain environmental condition, high polymeric solids may craze at a crack tip. The craze zone initiated in front of the crack tip may develop with elapse of time. Unfortunately, not so many studies about this problem have not been carried out, although it is important in relation to the environmental delayed crack growth.The present experiment was carried out to investigate the relation of craze zone length in front of a crack tip to testing time. The results were compared with the theory proposed by Marshall et al. It was found that their theory was not satisfactory enough to explain the craze growth over the whole range of testing time. A new model taking a creep effect into account was proposed. The theoretical predictions derived from the model were compared with the experimental results. Fairly good agreement was obtained.