A Technique for Stress Visualization
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概要
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This paper is concerned with principles for a technique of stress visualization. This technique depends on the possibility of utilizing the yield phenomena of a carbon steel strip as revealed by a stress-strain diagram. To begin with, the physical meaning of the yield point elongation of the stress-strain diagram of carbon steel is investigated. The strains displayed on the horizontal axis are the striped patterns or stretcher strains that one can easily discern by the naked eye, while the stress displayed by the vertical axis is the specific yield stress as the stress is acting on the material. The striped patterns and the yield stress are two aspects of the identical phenomenon, and accordingly the two aspects maintain an exact correspondence. Any location on the test strip which is acted upon by yield stress is in a plastic state. Such a plastic state is visible to the naked eye in the form of striped patterns. Thus, the striped patterns renders the yield stress visually observable. In instances like this the special instruments for the detection of plastic states are not useful, but one need only polish the surface of the test strip to a fine smoothness in order to easily detect yield stress with the naked eye. One of the most useful stress visualization techniques is to utilize the striped pattern which always appears in concomitace with yield point elongation. As a concrete example of the visualization of yield stress, a plastic region is made visibly observable by applying both a tensile load and torque to a notch tip.
- 明治大学の論文
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