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LONGITUDINAL STRESS (FORCE) MEASUREMENT OF RAIL UNDER OPERATING CONDITIONS

Award Information

Agency:
Department of Transportation
Branch:
N/A
Award ID:
1839
Program Year/Program:
1986 / SBIR
Agency Tracking Number:
1839
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
Magnasonics Inc
215 Sierra Dr Se Albuquerque, NM 87108
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
 
Phase 2
Fiscal Year: 1986
Title: LONGITUDINAL STRESS (FORCE) MEASUREMENT OF RAIL UNDER OPERATING CONDITIONS
Agency: DOT
Contract: N/A
Award Amount: $265,705.00
 

Abstract:

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.

Principal Investigator:

Dr. George A. Alers
Investigator
0

Business Contact:

Dr. george a. alers
PRESIDENT
Small Business Information at Submission:

Magnasonics Inc.
215 Sierra Drive Se Albuquerque, NM 87108

EIN/Tax ID:
DUNS: N/A
Number of Employees: N/A
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No