New strain measurement technology for material damage assessment

Larry D. Thompson; Bruce D. Westermo

doi:10.1117/12.173968

1 May 1994 New strain measurement technology for material damage assessment

Larry D. Thompson, Bruce D. Westermo

Proceedings Volume 2191, Smart Structures and Materials 1994: Smart Sensing, Processing, and Instrumentation; (1994) https://doi.org/10.1117/12.173968
Event: 1994 North American Conference on Smart Structures and Materials, 1994, Orlando, FL, United States

Abstract

A new strain sensing methodology for the measurement of peak strain in engineering materials has been developed. The approach involves the correlation of change in the magnetic susceptibility attendant with the strain-dependent, solid-state phase transformation in a sensing element. The sensing materials are metastable steel alloys that irreversibly transform from nonferromagnetic to ferromagnetic behavior as a function of the peak, applied normal strain. The technology makes available a reliable method for passive, semi-active, or active monitoring of strains or deflections and is applicable as either embedded sensors or attached strain gages, i.e., monitors. Strain assessment devices of various types have been conceptualized to meet a variety of needs. The history, principles, and test data on the development are presented. Discussion and results of a prototype system installed on the I-95 Savannah River bridge are presented. Examples of current projects and future applications of the technology are presented and discussed. A range of applications is discussed that illustrates the versatility of the approach and the value of such systems in materials and structural safety assessment.

Citation Download Citation

Larry D. Thompson and Bruce D. Westermo "New strain measurement technology for material damage assessment", Proc. SPIE 2191, Smart Structures and Materials 1994: Smart Sensing, Processing, and Instrumentation, (1 May 1994); https://doi.org/10.1117/12.173968

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