Metallurgical Analysis of Cracked Redundant Valves for Propellant Flow Control in the Attitude Orbital Control System of a Satellite |
| |
| Authors: | Abhay K Jha A Venugopal K SreeKumar |
| |
| Affiliation: | (1) Materials Characterisation Division, Materials and Metallurgy Group, Vikram Sarabhai Space Centre, Indian Space Research Organisation, Trivandrum, 695 022, India |
| |
| Abstract: | Attitude Orbital Control System (AOCS) thrusters, used in Indian satellites employ Latchable Series Redundant Valves (LSRV)
for propellant flow control. The valve body has a major component called bobbin, which comprises four parts, three parts made
of AISI 304L stainless steel and one part of AISI 446 stainless steel. About 150 bobbins were electron beam welded and one,
from a group of thirty bobbins, developed a crack in the HAZ of one of the face welds. Detailed analysis revealed that the
crack was due to stress-assisted cracking phenomenon. The stress induced by press fitting of a part in between other two parts
of valve was primarily responsible for the cracking. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
