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TECHNIQUE AS A FATIGUE INDICATOR FOR MILITARY BRIDGES

Award Information

Agency:
Department of Defense
Branch:
Army
Award ID:
30
Program Year/Program:
1983 / SBIR
Agency Tracking Number:
30
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
Daedalean Associates, Inc.
15110 Fredrick Road Woodbine, MD 21797
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
 
Phase 1
Fiscal Year: 1983
Title: TECHNIQUE AS A FATIGUE INDICATOR FOR MILITARY BRIDGES
Agency / Branch: DOD / ARMY
Contract: N/A
Award Amount: $49,170.00
 

Abstract:

THE DEVELOPMENT OF THE INTERNAL FRICTION DAMPING NON- DESTRUCTIVE EVALUATION TECHNIQUE AS A FATIGUE INDICATOR FOR MILITARY BRIDGES. A NONDESTRUCTIVE TEST TECHNIQUE WHICH HAS THE POTENTIAL FOR MEASURING THE DEGREE OF FATIGUE IN MILITARY BRIDGE STRUCTURES HAS BEEN INDENTIFIED BY US. THE TECHNIQUE IS CALLED INTERNAL FRICTION DAMPING NONDESCTRUCTIVE EVALUATION. THE PHYSICAL PROPERTY THAT IS MONITORED IN THIS TECHNIQUE IS THE RATE AT WHICH AN ENERGY IMPULSE IMPARTED TOA MATERIAL OR STRUCTURE DECAYS DUE TO THE INTERNAL FRICTION OF THE MATERIAL. A CHANGE IN THE RATE OF DECAY REFLECTS CHANGES IN THE BASIC CHEMICAL AND/OR MECHANICAL PROPERTIES OF THE MATERIAL DUE TO AN ACCUMLATION OF SUBTLE MATERIAL VARIABLES. THESE MATERIAL VARIABLES INCLUDE THE GRAIN SIZE, CHEMICAL COMPOSITIONS, INTERSITIAL ELEMENTS, DISLOCATIONS, PRECIPITATE PARTICLES, STRAIN RATE EFFECTS, ETC. BY PROPER MONITORING OF THE ACCUMULATION OF THESE INSIDIOUS VARIABLES, IT IS POSSIBLE TO PREDICT THE REMAININGUSEFUL LIFE OF A MATERIAL BEFORE FAILURE OCCURS. IT IS THE OBJECTIVE OF THE FIRST PHASE OF THIS PROGRAM TO ADAPT THIS TECHNIQUE TO MILITARY BRIDGES BY FIRST IDENTIFYING THE CHARACTERISTICS DAMPING COEFFICIENT VERSUS FATIGUE LIFE CURVE FOR BAR SPECIMENTS OF THE MATERIALS USED IN THE BRIDGES AND THEN DEMONSTRATING ITS SUCCESSFUL APPLICATION BY FATIGUING A FULL SIZED BRIDGE GIRDER AND COMPARING THE DDAMPIG COEFFICIENTS DURING ITS FATIGUE LIFE TO THOSE OBTAINED WITH THE BAR SPECIMENS.

Principal Investigator:

Business Contact:

Robert S. Wenreich
3014422620
Small Business Information at Submission:

Daedalean Associates, Inc.
15110 Fredrick Road Woodbine, MD 21797

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