Experimental analysis of the effect of grain size on the mechanical behaviour of thin copper sheet in pure moment bending

Abstract

Abstract

During the bending process, both tensile and compressive stresses act on material layers. An estimation of the stress values can be based on information taken from a standard tensile test, but this method cannot take into account some of the complex effects that take place during bending. However, it is possible to obtain experimental material characteristics from a pure moment bending test. Such characteristics include the complexity of the process, as well as the material elastic and plastic properties. A special device was developed to carry out pure moment bending tests on microspecimens. In the case of very small elements, the microstructure of the workpiece plays a key role in the mechanism of plastic deformation. The influence of grain size has been investigated and analysed for a 0.1 mm thick copper sheet.