Fatigue life cycle estimation and reliability analysis of hydraulic plumbing of a launch vehicle control actuator Online publication date: Thu, 25-Oct-2018
by V. Murugesan; P.S. Sreejith; Shashi Bhushan Tiwari; K. Kumar
International Journal of Materials and Structural Integrity (IJMSI), Vol. 12, No. 4, 2018
Abstract: One of the single point failure modes identified for the electro hydraulic control actuators of launch vehicles, is the fatigue failure of the hydraulic plumbing and its joints due to severe vibration environments. This paper presents a case study of the fatigue analysis on the hydraulic plumbing with flared coupling joint, subjected to high vibration levels. An evaluation of the vibration response of the system is made through analysis and experimentation. A finite element model of the plumbing is made to capture the dynamic behaviour of the system. The alternating stresses are assessed by dynamic stress analysis using the validated model. Fatigue life cycle estimation and reliability of the joint are determined pragmatically through stress life methods, based on the local peak stress, the corresponding local strength, and their statistical distribution. Based on the study, a simple design solution is suggested to improve the robustness of the critical control actuator of the launch vehicle.
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Materials and Structural Integrity (IJMSI):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.
If you still need assistance, please email subs@inderscience.com