Abstract
The initiation and growth of crazes on the surface of PMMA were investigated under various levels of environmental temperature and applied stress. In this report, craze growth equations were derived on the basis of the rate process theory, considering the increase of activation energy for craze growth, and cessation of craze growth was discussed. Average craze length and total sum of craze length per unit area were calculated theoretically and experimentally and the theory agreed with the experimental results for low craze density. Crazing and uncrazing surfaces were observed by means of metallographical and interference microscopes. Slip lines were observed at the craze tip of unyielded specimens. It was found protuberances 0.1-0.2μm in height occurred around the craze due unloading.
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