A New Apparatus for Calibration of Constitutive Models and Frictionfor Powder Compaction

摘要

Numerical modelling of powder compaction requires the use of sophisticated constitutivernmodels which describe the response of the powder material during compaction. Therndevelopment and calibration of constitutive models requires experimental data which isrnusually generated using highly specialised triaxial testing systems. In this paper we describerna new apparatus consisting of a die instrumented with radial stress sensors which is used torngenerate constitutive parameters in a simple and efficient manner. The system can also bernused to measure the coefficient of friction between powder and die wall. Constitutive andrnfriction data are generated for a range of materials including ferrous powders. The results arernpresented in a form convenient for implementation in finite element packages. Numericalrnsimulation of the compaction of simple parts is demonstrated.