Abstract
Contact pressure distribution (CPD) on tool surface is very important in metal forming for description of wear mechanism and wear development, tool strength calculation and selection of tool material, selection of lubricant and so on. Shortage in CPD data has been a serious limitation in development of some forming processes and in analysis of deformation behaviour of complex structures, e.g. compound metals. Application of pressure sensing foil (PSF) has provided a possibility for getting an extensive data on pressure distribution. Some experimental examples of using PSF for upsetting are presented for various compound specimens made of Al and Cu. There have been used cylindrical specimens with Al (or Cu) matrix and Cu (or Al) filaments in the shape of ring or rods as well as Al (or Cu) cubic specimens with Cu (or Al) rectangular prism filaments. Also an effect of grain size on CPD has been taken into account. The experimental results on CPD are compared with the results of calculations obtained by means of finite element method. Results have shown considerable differences in contact pressure values for matrix and filaments as well as abrupt changes in CPD at boundaries between matrix and filaments. PSF technique has proved to be a very sensitive tool to reveal even subtle differences in pressure distribution.
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