The cross-sectional area and length of the sample change continuously during the tensile test. Is it possible to determine the sample's actual cross-sectional area?
We might assume that volume is constrained (the same way we can determine the True stress-strain), so we assume A"L"=AL, where A and L are cross-sectional area and length, respectively. However, I'm not sure if this assumption holds true during plastic deformation, particularly in fine wires. I am concerned about the formation of microcracks during plastic deformation, as well as the change in cross-section and, as a result, the change in electrical resistance. As a result, I am attempting to find a solution for locating some studies/methods that can assist in investigating the cross-sectional area change of fine wires in a more appropriate manner from start to the end of the whole experiment.
Hi,
Not sure what are your sample dimensions, but possibly you can setup stereo DIC like in these compression tests:
Article Experimental characterisation of the dilation angle of polymers
In the article we were looking into dilation angle/plastic Poisson's ratio, which is related to volumetric changes during plastic flow.
DIC technique can measure continously the change of the cross section during the tensile test
Besides Digital Image Correlation (DIC) technique I may propose measuring of transverse deformation of sample during tension test by contact or video extensometer. This simple procedure allow us to determine real cross section (for example, if sample has circular cross section).
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