MALFUNCTION INVESTIGATION OF ROCKET, PRACTICE, 3.5-INCH: M29A2 AND ROCKET, SMOKE, 3.5-INCH: WP, M30 (RUPTURED MOTOR BODIES),
Abstract
Malfunction investigations were made of practice rockets and smoke rockets. The rockets malfunctioned because the igniter functioned with a force sufficient to split the motor from end to end, partially disrupted the tail assembly and split the rear barrel assembly from the launcher. It was determined that these malfunctions were caused by the presence of a lap at the outer surface and of intermediate transformation products in the microstructure which acted as a focal point for stress concentration, reducing the effective cross-sectional area, and lowering the impact and tensile strength of the motor body; excessive nonmetallic inclusions in the steel being drawn into stringers in the tubing wall parallel to the axis; severe quenching after heat-treatment to meet required physical condition, and cracking at the nozzle mouth due to forging and heat-treating. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1963
- Accession Number
- AD0423409
Entities
People
- John Mcpartland
- Joseph V. Urodzinski
Organizations
- Picatinny Arsenal