An experimental determination of the fields of strains and stresses in the elastoplastic range
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In order to determine the fields of strains and stresses in the elastic and plastic ranges, for the plane-stress problem, a so-called chromorheological (CHR) model has been utilized. On one side of the model the development of plastic deformations, including the elastoplastic boundaries at any stage of loading, can be either visually observed or recorded on film. On the other side of the model, a birefringent coating is adhered from which regular experimental data can be obtained. These data, together with the yield condition, render the possibility of finding the state of stresses at all the points of the known elastoplastic boundaries.
The problem of stress in the plastic range is statically determinate. The experiment provides all the data on the boundaries, and thereby the field of stresses in the plastic range can be calculated. The field of strains in the elastic and plastic zones can be obtained by the well-known method of photoelasticity. In this way, the relationship between stresses and strains in the plastic zones can be worked out. The effectiveness of the approach on a strip with a central hole has been proven by experimental research.
KeywordsExperimental Data Mechanical Engineer Plastic Deformation Fluid Dynamics Experimental Determination
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