Failure Analysis of Rocket Shell puncher Die
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Date
2016-08
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Addis Ababa University
Abstract
This paper studied Failure analysis of Rocket Shell punching die manufactured in Homicho
ammunition and engineering industry having the crack on the surface of the male punching die.
Detailed investigations including macroscopic examination, metallographic observation, and
mechanical properties analysis were carried out. The investigations reveal that the failure
mechanism of the punching die is fast brittle fracture caused by high stress under the
condition of material self-embrittlement. As it is observed on 39 pieces of the puncher the main
crack originated from the lower tip that has a direct contact with the hot of the punching die. The
serious impact toughness degeneration and presence of impurities at the internal section of the
die resulted in the material embrittlement. The hardness test and the oxidation process formed
inside the material demonstrate that the site 1 and 2 has suffering high stress is the weak part of
the die.
Key words: Punching die, failure Analysis; Rocket shell: Fatigue failure; selfembrittlement;
oxidation layer; heat treatment, crack zone
Description
Keywords
Punching die; failure Analysis; Rocket shell: Fatigue failure; selfembrittlement; oxidation layer; heat treatment; crack zone