Accession Number:

ADA196060

Title:

Improved Nondestructive Testing of 60 mm M720 Mortar Projectile Magnetic Flux Leakage Inspection System of M720 Mortar

Descriptive Note:

Final rept. 1985-1987

Corporate Author:

ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ PRODUCT ASSURANCE DIRECTORATE

Personal Author(s):

Report Date:

1988-08-01

Pagination or Media Count:

35.0

Abstract:

The objective of this project was to provide basic outline drawings BOD for the concept design level 1 and specifications of an automated magnetic flux leakage inspection system AMFLIS for detecting anomaliesflaws within the projectile body of the 60 mm mortar. The inspection of the M720 mortar projectile body for anomalies was performed by magnetic particle inspection MPI followed by visual inspection before and after painting the projectile using normal light. MPI cannot indicate the depth of a crack anomaly therefore, as per the item specification, no cracks in the projectile body shall be accepted and thereby increase the cost of the projectile body due to false rejects. The basic principles of MFL are shown in figure 1. The item tested was rotated in the field of a magnet and was magnetically saturated. In the absence of defects discontinuities, the magnetic flux lines saturated continue to be contained and flow within the interior of the test item. If any defects were present, they forced some of the flux lines to flow external to the surface of the test item producing a leakage field.

Subject Categories:

  • Ammunition and Explosives
  • Guns

Distribution Statement:

APPROVED FOR PUBLIC RELEASE