Development of smart solid state structural damage assessment systems for underground facilities

John S. Dunning; Larry D. Thompson

doi:10.1117/12.209330

12 May 1995 Development of smart solid state structural damage assessment systems for underground facilities

John S. Dunning, Larry D. Thompson

Proceedings Volume 2447, Smart Structures and Materials 1995: Industrial and Commercial Applications of Smart Structures Technologies; (1995) https://doi.org/10.1117/12.209330
Event: Smart Structures and Materials '95, 1995, San Diego, CA, United States

Abstract

Quantitative data on the stress-strain behavior of walls and roofs of underground mines are unavailable. It is established practice to use roof bolts to support roofs and ribs in mines. The U.S. Bureau of Mines and Strain Monitor Systems, Inc. are jointly developing smart materials and passive or active detection systems capable of monitoring the stress/strain history of mine roofs with the goal of detecting structural damage. The systems can be designed for a passive mode to monitor peak strain or an active mode for a real-time alarm response, the smart materials to be used in this application are TRIP (TRansformation Induced Plasticity) steels. TRIP steels are materials which change state from austenitic, nonmagnetic to a martensitic, ferromagnetic phase as the material undergoes straining. There is a direct correspondence of the peak strain level experienced in the material with the percentage of ferromagnetism, hence monitoring the relative amount of the ferromagnetic content will indicate the level of strain (and therefore stress). The phase transition that accompanies the straining is irreversible so the monitor material indicates the peak strain until that value is subsequently exceeded. Materials research discussed will cover the selection of compositions with a suitable ferromagnetic response and the development of thermomechanical treatments to achieve high tensile strength required for this application. Tensile properties and related phase changes are described with preliminary system designs and proposed installation techniques.

Citation Download Citation

John S. Dunning and Larry D. Thompson "Development of smart solid state structural damage assessment systems for underground facilities", Proc. SPIE 2447, Smart Structures and Materials 1995: Industrial and Commercial Applications of Smart Structures Technologies, (12 May 1995); https://doi.org/10.1117/12.209330

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