Failures Of The M72A2 Law Rocket System

Item

Title
Failures Of The M72A2 Law Rocket System
Report Number
AFWAL-TR-81-4019 Volume II p. 329-343
Creator
Bruggeman, G. A.
Corporate Author
Army Materials and Mechanics Research Center
Laboratory
Materials Laboratory
Date
1980
Date Issued
1980-11
Extent
15
Identifier
ADA115875
Abstract
Over a period of several years, the M72A2 LAW Rocket has experienced a number of malfunctions traceable to failures of either the rocket motor closure or the rocket motor itself. Both of these components are made of 7001 aluminum alloy heat treated to the T6 temper, an alloy known to possess low fracture toughness properties and also to be highly susceptible to stress corrosion cracking. The role of stress corrosion in a number of these malfunctions is discussed, and the remedies chosen to alleviate each problem as it occurred are described. Comparisons are made between the mechanical and physical properties of material from production lots manufactured during different time periods, and comments are made regarding factors that would appear to be contributing to the on-going stress corrosion problem.
Description
Over a period of several years, the M72A2 LAW Rocket has experienced a number of malfunctions traceable to failures of either the rocket motor closure or the rocket motor itself. Both of these components are made of 7001 aluminum alloy heat treated to the T6 temper, an alloy known to possess low fracture toughness properties and also to be highly susceptible to stress corrosion cracking. The role of stress corrosion in a number of these malfunctions is discussed, and the remedies chosen to alleviate each problem as it occurred are described. Comparisons are made between the mechanical and physical properties of material from production lots manufactured during different time periods, and comments are made regarding factors that would appear to be contributing to the on-going stress corrosion problem.
Distribution Classification
1
Distribution Conflict
No
DTIC Record Exists
No
Illinois Tech Related
No
Photo Quality
Complete
Report Availability
Full text available
Type
article
Is Part Of
Proceedings of the 1980 Tri-Service Conference on Corrosion Volume II
Media
article14