An Experimental Study of Fragmentation by High Velocity Impacts on a Target and by Air Jet Milling

Publication Reference: 
ARR-27-05
Author Last Name: 
Dodds
Authors: 
J Dodds, Ecole de Mines, Albi; P Guigon, Compiegne; M-N Pons, Nancy
Report Type: 
ARR
Research Area: 
Size Reduction
Publication Year: 
1997
Country: 
France

The objective of this part of the report is to present the lastest results on cornmunition under the IFPRI grant that started in 1993. We recall that the objectives of the research are to develop fundamental understanding and techniques to predict communition behaviour from a universal test. An experimental rig was built up to reproduce single impact on a target in an air jet mill. The influence of the material properties on breakdown was investigated in ultra- fine grinding.

Section 1 presents the results of the single particle impact experiments performed with the single jet apparatus. The influence of the size of particle is shown with glass beads and two polymers.

Section 2 gives the results of the study of repeated impacts. Two approaches are used to compare the efficiency with a single impact

Section 3 studies the influence of the process of different hydrargillites on their behaviour at impact.

Morphological analysis tools are used in relation with the classical study (fragmentation profiles).