Challenges in detecting damage in the presence of microstructural inhomogeneties in a friction stir welded aluminum alloy for reusable cryotanks

Shamachary Sathish; Kumar V. Jata; Richard W. Martin; Richard Reibel

doi:10.1117/12.658667

28 March 2006 Challenges in detecting damage in the presence of microstructural inhomogeneties in a friction stir welded aluminum alloy for reusable cryotanks

Shamachary Sathish, Kumar V. Jata, Richard W. Martin, Richard Reibel

Author Affiliations +

Proceedings Volume 6177, Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems V; 617703 (2006) https://doi.org/10.1117/12.658667
Event: Nondestructive Evaluation for Health Monitoring and Diagnostics, 2006, San Diego, CA, United States

Abstract

Continuous real time structural health monitoring will be a requirement for future space launch missions. Reusable metallic cryotanks manufactured using Friction Stir Welding (FSW) technology for multiple missions, demands weld and microstructural integrity. The FS weld contains multiple interfaces and a variety of microstructures. To develop NDE-based health monitoring capability which detects damage and monitors the progression of damage, in the presence of these microstructural inhomogeneities, is a challenging task. Most structural health monitoring techniques are based on acoustic wave propagation. To design and develop efficient and optimized health monitoring capability based on acoustics, it is necessary to incorporate local elastic property variations that arise due to differences in the weld microstructure. These local elastic property changes across FSW regions have been measured using a focused acoustic beam. Measurements across the weld line show variations with a maximum change of 1% in the sound velocities. Macroscopic measurements of velocity of surface acoustic waves propagating across and also parallel the weld line in a large plate show significant variation. Experimental results of local and macroscopic sound velocity measurements from the changing microstructure along with their impact on the design of structural health monitoring system are discussed.

Citation Download Citation

Shamachary Sathish, Kumar V. Jata, Richard W. Martin, and Richard Reibel "Challenges in detecting damage in the presence of microstructural inhomogeneties in a friction stir welded aluminum alloy for reusable cryotanks", Proc. SPIE 6177, Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems V, 617703 (28 March 2006); https://doi.org/10.1117/12.658667

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available