Modares Mechanical Engineering

Modares Mechanical Engineering

Experimental and Analytical Study of Effective Factors on Compaction Process of Aluminium Powder under the Impact Load by Low Speed

Authors
Majid Alitavoli
Hashem Babaei
Ali Mahmoudi
Ali Golbaf
Tohid Mirzababaie Mostofi
Abstract
The aim of this paper is to investigate the green density, the percentage of porosity and the density distribution of materials which have been produced by powder compaction procedure under low rate impact loading by using drop hammer both experimentally and analytically. Effect of grain size and different level of energy on density is carried out in the experimental section. In this regard, the effect of different level of energy are investigated by changing mass and height of hammer. The analytical section presents a relation for green density considering a small element of compacting piece and using equilibrium equation, continuity equation and Levy-Mises equation. Using the statistical analysis leads to investigation of the effect of grain size and friction coefficient simultaneously as two impressive factors on analytical green density. In the next step, the percentage of porosity and density distribution was calculated analytically and compared with experimental values. The satisfactory accordance between Experimental results and analytical ones validates the presented analytical results. Also by applying two constant quantities, shape factor and work hardening in analytical relations, the effect of these factors on percentage of porosity and density distribution of products have been investigated.
Keywords
Drop hammer
Powder Compaction
Impact Loading
Modares Mechanical Engineering
Volume 15, Issue 7
September 2015
Pages 22-30