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Geomechanics and Engineering
  Volume 10, Number 1, January 2016 , pages 109-124
DOI: https://doi.org/10.12989/gae.2016.10.1.109
 


Dynamic compaction of cold die Aluminum powders
Hashem Babaei, Tohid Mirzababaie Mostofi, Majid Alitavoli, Nasir Namazi and Ali Rahmanpoor

 
Abstract
    this paper, process of dynamic powder compaction is investigated experimentally using impact of drop hammer and die tube. A series of test is performed using aluminum powder with different grain size. The energy of compaction of powder is determined by measuring height of hammer and the results presented in term of compact density and rupture stress. This paper also presents a mathematical modeling using experimental data and neural network. The purpose of this modeling is to display how the variations of the significant parameters changes with the compact density and rupture stress. The closed-form obtained model shows very good agreement with experimental results and it provides a way of studying and understanding the mechanics of dynamic powder compaction process. In the considered energy level (from 733 to 3580 J), the relative density is varied from 63.89% to 87.41%, 63.93% to 91.52%, 64.15% to 95.11% for powder A, B and C respectively. Also, the maximum rupture stress are obtained for different types of powder and the results shown that the rupture stress increases with increasing energy level and grain size.
 
Key Words
    aluminum powder; compaction; drop hammer machine; impact loading; powder metallurgy
 
Address
(1) Hashem Babaei, Tohid Mirzababaie Mostofi, Majid Alitavoli, Nasir Namazi:
Department of Mechanical Engineering, Engineering Faculty, University of Guilan, Rasht 3756-41635, Iran;
(2) Ali Rahmanpoor:
Department of Mechanical Engineering, Roudbar Branch, Islamic Azad University, Roudbar, Iran.
 

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