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鄭世喜,林載奎,金貴子 全北大學校 1986 論文集 Vol.28 No.-
The fracture toughness of elasto-plastic materials was directly affected by the size, shape of plastic zone which are great important parameter in large scale fracture mechanics. This paper is to observe the influences of the interference of notches on plastic deformation at notch tip of double notch. Specimens were tested by four point bending, and then the shape of the plastic deformation could be visualized with the technique of recrystallization. Beside, numerical method for the analysis of the plastic zone with a F.E.M. (Finite Element Method) were used. The obtained results are summarized as follows: 1) The behavior of plastic zone on double notch was different from single notch. 2) When the plastic zone was saturated at a limitation on the middle between the notches, the behavior of the plastic deformation of double notched specimen was similar to that of the single notch. 3) Maximum equivalent plastic strain was shown at the tips of both single and double notch. 4) The evaluated model of plastic zone by F.E.M. corresponded to the results of the experiment.