Axial and Bending Fatigue Testing of AISI 304 L Plumbing Tubes Used for Launch Vehicles Control System

Abstract:

Gimbaling the engine nozzle within a specified angle through hydraulic actuator modules is commonly used to control the trajectory path of satellite launch vehicles. During one of the hot test of a liquid engine stage, a drop in system pressure in actuator module was noticed due to cracking of case drain plumbing inside the ferrule. The tensile and fatigue (axial and bending) test of the tube material was carried out to understand the cause of failure, simulating the actual service conditions such as strength and bending moment in assembled tube. Findings of the metallurgical investigation along with the fatigue test results were presented in this paper.

• Periodical: Materials Science Forum (Volumes 830-831)
• Pages: 187-190
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.830-831.187
• Online since: September 2015
• Authors: P. Manikandan, G. Sudarsana Rao, J. Srinath, V.M.J. Sharma, P. Ramesh Narayanan, S.C. Sharma, Koshy M. George
• Keywords: AISI 304L Tube, Bending Fatigue, Fatigue Striations, Tension-Tension Fatigue

References

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DOI: 10.1016/j.engfailanal.2012.08.008

[2] ASTM E 8M, Standard Test Methods for Tension Testing of Metallic Materials [Metric], Annual book of ASTM standards, Vol. 3. 01 (2011).

[3] ASTM E 466, Standard practice for Conducting Force Controlled Constant Amplitude Axial Fatigue Tests of Metallic Materials, Annual book of ASTM standards, Vol. 3. 01 (2011).

DOI: 10.1520/e0466-21