STINGER Launch and Flight Motor Case Evaluation.
Abstract
An investigation was initiated to evaluate the acceptability of the STINGER launch and flight motor cases. These efforts consisted of evaluating the mechanical properties of the 300 grade maraging steel launch and flight case material by tensile tests and evaluating the strength of the launch and flight cases by hydroburst and the launch cases by dynamic burst. The dynamic burst pressure for the launch motor cases with 0.127-mm (0.005-in.) radius keys was 5.254 MPa (762 psi) higher than the standard hydroburst pressure of 54.248 MPa (7868 psi), an increase of 10%. The STINGER launch motor system reliability at the expected operating conditions is thereby increased significantly because the design was based on standard hydroburst strength. The results for the flight motor cases tested in this program reflected problems with the thread design of the forward joint although the results from one test and others from Atlantic Research Corporation indicate that the burst pressure is certainly well above requirements. The strength of the flight motor case could be reduced significantly and, in fact, should be if possible because of the potential of failure due to marginal fracture toughness capability. An undetected flaw or especially one introduced after the proof test during the service life could result in catastrophic failure.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1976
- Accession Number
- ADA035944
Entities
People
- James W. Wright Jr.