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Proceedings Paper

Use of shape memory alloys for strength and fatigue life enhancement of cracked metallic structures
Author(s): Kelly A. Tsoi; Stephen C. Galea; Albert K. Wong
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Paper 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.

Paper Details

Date Published: 14 November 1997
PDF: 10 pages
Proc. SPIE 3241, Smart Materials, Structures, and Integrated Systems, (14 November 1997); doi: 10.1117/12.293503
Show Author Affiliations
Kelly A. Tsoi, Defence Science and Technology Organisation (Australia)
Stephen C. Galea, Defence Science and Technology Organisation (Australia)
Albert K. Wong, Defence Science and Technology Organisation (Australia)


Published in SPIE Proceedings Vol. 3241:
Smart Materials, Structures, and Integrated Systems
Alex Hariz; Vijay K. Varadan; Olaf Reinhold, Editor(s)

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