Abstract
It is a well-known fact that there is significant difference in magnitude of flow stresses and work hardening rates of Polycarbonate between in tension and compression. In order to express such asymmetries in the flow stresses and the work hardening rates, it seems to introduce the first or third invariant of flow stress into the yield function, and in the former case, a material now under consideration may or may not exhibit the plastic compressibility. The aim of this study is to measure the variation of plastic Poisson’s ratio by means of Digital Image Correlation method to clarify the existence of the plastic compressibility of Polycarbonate. The authors conducted tensile tests of thin strip specimens, and measured the axial and lateral strains by DIC method, then, plastic Poisson's ratio was derived. The result showed that plastic Poisson’s ratio of Polycarbonate was smaller than the value of 0.5, that result in the existence of plastic compressibility in this material.
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