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- Title
Failure Analysis of the M5-Brass Shear Screw Used in an Aerospace Ordinance Applications.
- Authors
Yerrinaidu, Lagudu; Ranjith, R.; Manwatkar, Sushant K.; Gupta, Rohit Kumar
- Abstract
Leaded brasses are known for their superior machinability, moderate strength, and good functional properties. It is extensively used in the aerospace ordinance pyrotechnic applications of satellite separation systems. The current analysis discusses two kinds of failures, where samples are from the same batch. One shear screw failed during assembly, whereas six out of seven screws failed in the vibration test. Detailed metallurgical analysis was conducted using scanning electron microscopy (SEM), optical microscopy (OM), microhardness, and x-ray diffraction. SEM observations revealed dimples in the failed shear screw of the pyro-device assembly, whereas the sample that failed in the vibration test showed fatigue striations. Microstructure, chemical composition, and XRD confirmed alpha + beta and lead phases. Microhardness values are in the range of 135–138 VHN. Based on all the observations, failure in assembly is due to overloading caused by excessive misalignment of the shear screw, whereas failure in the case of a vibration test is due to a higher level of vibration aided by misalignment. It is suggested to check the proper alignment of the shear screw using an alignment tool during assembly.
- Subjects
FAILURE analysis; SCREWS; VIBRATION tests; METALLURGICAL analysis; MICROHARDNESS; SCANNING electron microscopy; LEAD
- Publication
Journal of Failure Analysis & Prevention, 2024, Vol 24, Issue 1, p291
- ISSN
1547-7029
- Publication type
Article
- DOI
10.1007/s11668-023-01839-w