Abstract
A new method for observing material flow and measurement of plastic strain during metal forming process was proposed and validated by using a forging experiment. A specimen assembled by machined threaded screw rings was used in the experiment and the deformed specimen was cut along the cross-section. The deformed screw/matrix interfaces on the section were observed and measured by using a microscope. The plastic strain on the screw interfaces was calculated by the change of screw pitch. The experimental results and numerical simulation showed good agreement. The main advantages of this method are that it can be used to analyse metal flow behaviour without substituting matrix material and it can provide quantitative results.
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