Use of shape memory alloys for strength and fatigue life enhancement of cracked metallic structures

Kelly A. Tsoi; Stephen C. Galea; Albert K. Wong

doi:10.1117/12.293503

14 November 1997 Use of shape memory alloys for strength and fatigue life enhancement of cracked metallic structures

Kelly A. Tsoi, Stephen C. Galea, Albert K. Wong

Proceedings Volume 3241, Smart Materials, Structures, and Integrated Systems; (1997) https://doi.org/10.1117/12.293503
Event: Far East and Pacific Rim Symposium on Smart Materials, Structures, and MEMS, 1997, Adelaide, Australia

Abstract

A number of techniques are available which will enhance residual static strength and fatigue life of metallic components. In the case where a crack exists a simple method is to stop drill the crack tips. More elaborate techniques consist of stop drilling the crack tips, cold expanding the resultant hole and inserting an interference-fit plug. The application of bonded composite repairs to cracked metallic structures has also become an accepted technique to enhance strength and fatigue life of cracked metallic components. This paper looks at the possibility of using smart materials such as shape memory alloys (SMA) for the life enhancement of metallic structures. An investigation into the use of SMAs was completed using finite element modeling of one particular concept known here as the annular SMA repair which was presented as one method of possibly increasing the fatigue life of holes. From the results given in this paper it was shown that the inclusion of a SMA ring, interference fitted into a machined annulus in an aluminum plate, induces a significant compressive stress around the boundary of a hole. Also, discussed are other ideas which use SMAs for repairing cracked metallic components. Although the current studies are only conceptual and qualitative they do illustrate the feasibility and potential of such techniques to enhance strength and fatigue life of metallic components.

Citation Download Citation

Kelly A. Tsoi, Stephen C. Galea, and Albert K. Wong "Use of shape memory alloys for strength and fatigue life enhancement of cracked metallic structures", Proc. SPIE 3241, Smart Materials, Structures, and Integrated Systems, (14 November 1997); https://doi.org/10.1117/12.293503

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