Observation of Plastic Flow Process near the Notch Front in Steel in Low Temperature Range by Optical Interference Method

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The dependence of plastic flow process on temperature and thickness, for a slit notched three point bending specimen, was investigated by continuous direct observation, using the optical interference method. The relationship between the degree of plastic constraint and plastic flow process or applied load was made clear. Moreover, the cleavage fracture behaviours were discussed based on the observed plastic flow process. Main results obtained are as follows. (1) The plastic flow process in low temperature range and the degree of plastic constraint can be estimated by the optical interference method. (2) The state of stress triaxiality is characterized by the transition behaviours from the stage of local yielding to that of hinge type plastic flow. (3) The temperature effect on the size of plastic zone appeares only at the stage of hinge type in plastic flow process. (4) In slow bend test of Charpy size specimen, the cleavage fracture occurs either at stage of local yielding or after the general yield.
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