CONDITIONS

Award Information
Agency:
Department of Transportation
Branch
n/a
Amount:
$49,997.00
Award Year:
1985
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
1837
Agency Tracking Number:
1837
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
400 Hestor Street, San Leandro, CA, 94577
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
DR. BRUCE W. MAXFIELD
INVESTIGATOR
() -
Business Contact:
Dr. Bruce W. Maxfield
President
() -
Research Institute:
n/a
Abstract
OVER THE LAST 5 YEARS, A NUMBER OF ULTRASONIC APPROACHES TO RESIDUAL AND APPLIED STRESS MEASUREMENTS USING EMATS HAVE BEEN REPORTED. NONE OF THESE HAS BEEN EVALUATED ON STEEL BUT THERE ARE NO FUNDAMENTAL REASONS WHY MOST CANNOT BE APPLIED TO STEEL. WHEN THE MEASUREMENT CONSTRAINTS IMPOSED BY MAKING MEASUREMENTS WITH A DEVICE ATTACHED TO A RAILCAR TESTING VEHICLE ARE CONSIDERED, TWO EMAT ULTRASONIC APPROACHES TO ABSOLUTE LONGITUDINAL STRESS MEASUREMENT IN RAILS LOOKATTRACTIVE. EACH APPROACH USES SHEAR HORIZONTAL (SH) WAVES PENATRATING BENEATH THE PLASTICALLY DEFORMED SURFACE LAYER ARE USED. TRANSIT TIME MEASUREMENTS BETWEEN OR N ORTHOGONAL PAIRS OF TRANSDUCER MOUNTED RIGIDLY IN A HOLDER PROVIDE THE BASIC INFORMATION NEEDED TO DETERMINE THE LONGITUDINAL STRESS. THE SECOND APPROACH USES TWO BULK SH WAVES OF THOGONAL POLARIZATION. HERE, THE TRANSIT TIME OF THESE TWO WAVES OVER EXACTLY THE SAME ULTRASONIC PATH PROVIDES THE BASIC INFORMATION NEEDED FOR LONGITUDINAL STRESS DETERMINATION. THE TECHNICAL APPROACHES DESCRIBED IN THIS PROPOSAL PROVIDE INNOVATIVE SOLUTIONS TO THE VERY PRAC PRACTICAL NOISE PROBLEMS OF PERFORMING EMAT MEASUREMENTS WHILE SCANNING THE SENSORS AND TO THE DIFFICULTY OF OBTAINING RELIABLE VELOCITY DIFFERENCE INFORMATION IN A SCANNED ULTRASONIC SYSTEM.

* information listed above is at the time of submission.

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