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SBIR-STTR Award
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SBIR-STTR Award
10
Longitudinal stress (force) measurements in rails under operating conditions
Award last edited on: 12/19/2014
Sponsored Program
SBIR
Awarding Agency
DOT
Total Award Amount
$314,533
Award Phase
2
Solicitation Topic Code
-----
Principal Investigator
George A Alers
Company Information
Magnasonics Inc
215 Sierra Drive SE
Albuquerque, NM 87108
N/A
N/A
N/A
Location:
Single
Congr. District:
01
County:
Bernalillo
Phase I
Contract Number:
----------
Start Date:
----
Completed:
----
Phase I year
1985
Phase I Amount
$48,828
In 1982, a special committee of the nmab issued a report on the nondestructive methods that might be used to measure thelogitudinal force in installed rails. It showed that the acousto-elastic effect which infers the stress from measure ments of small shifts in the velocity of sound was promisingbut difficult to implement because variations in the metallurgical structure of the metal and uncertainties in the coupling between the rail and the transducer appear to cause velocity shifts that mask the desired measurements. This proposal avoids the coupling problem by using couplant-free emats and it minimizes the role played by metallurgicaltexture by using a newly discovered acousto-elastic effect that is based on the symmetry properties of the stress tens tensor rather than the values of any metallurgical constants. The proposed phase i effort is intended to demonstrate thefeasibility of deducing the logitudinal stress level from a portable probe held against the web of the rail.
Phase II
Contract Number:
----------
Start Date:
----
Completed:
----
Phase II year
1986
Phase II Amount
$265,705
___(NOTE: Note: no official Abstract exists of this Phase II projects. Abstract is modified by idi from relevant Phase I data. The specific Phase II work statement and objectives may differ)___ In 1982, a special committee of the nmab issued a report on the nondestructive methods that might be used to measure thelogitudinal force in installed rails. It showed that the acousto-elastic effect which infers the stress from measure ments of small shifts in the velocity of sound was promisingbut difficult to implement because variations in the metallurgical structure of the metal and uncertainties in the coupling between the rail and the transducer appear to cause velocity shifts that mask the desired measurements. This proposal avoids the coupling problem by using couplant-free emats and it minimizes the role played by metallurgicaltexture by using a newly discovered acousto-elastic effect that is based on the symmetry properties of the stress tens tensor rather than the values of any metallurgical constants. The proposed phase i effort is intended to demonstrate thefeasibility of deducing the logitudinal stress level from a portable probe held against the web of the rail.
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