SOLUTION-ADAPTIVE CODE FOR ANALYSIS OF FATIGUE CRACK PROPAGATION IN AEROSPACE STRUCTURES

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: N/A
Agency Tracking Number: 16895
Amount: $49,198.00
Phase: Phase I
Program: SBIR
Awards Year: 1991
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
3315 Bob Wallace Ave #107, Huntsville, AL, 35805
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
THIS PROJECT WILL DEVELOP SOLUTION-ADAPTIVE TECHNIQUES AND ACOMPUTER CODE FOR USE IN ANALYZING FATIGUE-CRACK PROPAGATIONIN AEROSPACE STRUCTURAL COMPONENTS. A FRACTURE ANALYSIS COMPUTATIONAL TOOL WILL BE CREATED USING MODERN ADAPTIVE FINITE ELEMENT TECHNIQUES, EXTRACTION FORMULAS, AND CRACK-PROPAGATION THEORIES. THE CODE WILL BE VIRTUALLY A STAND-ALONE MODULE IN THAT IT WILL REQUIRE NO ADDITIONAL STRUCTURAL MODELING OTHER THAN A DESCRIPTION OF THE MATERIALFLAW. IT WILL BE DEVELOPED AS A POST PROCESSOR TO EXISTING FINITE-ELEMENT PROGRAM PACKAGES. THE FINITE-ELEMENT MODEL OF THE UNFLAWED STRUCTURE WILL BE PREPARED IN THE SAME MANNER AS IS CURRENTLY DONE. FLAWS CAN BE INTRODUCED INTO THESE EXISTING FINITE-ELEMENT MODELS AND THE FRACTURE ANALYSIS PERFORMED IN A MANNER VIRTUALLY TRANSPARENT TO THE USER. WITH VERY LITTLE ADDITIONAL EFFORT THE STRESS ANALYSTCAN THEN PERFORM A FRACTURE-MECHANICS ANALYSIS. PHASE I WILL FOCUS ON SOLUTION-ADAPTIVE ALGORITHM DEVELOPMENT AND WILL UTILIZE STRESS-INTENSITY FACTOR CALCULATIONS FOR FATIGUE-LIFE PREDICTION. PHASE II WILL INCLUDE RESEARCH ANDDEVELOPMENT INTO CONSTITUTIVE THEORIES OF FRACTURE, ACCURATESTRESS RECOVERY PROCEDURES, ADAPTIVE REFINEMENT STRATEGIES, AND DEVELOPMENT AND DELIVERY OF A GENERAL THREE-DIMENSIONAL CODE. THIS PROJECT WILL DEVELOP SOLUTION-ADAPTIVE TECHNIQUES AND ACOMPUTER CODE FOR USE IN ANALYZING FATIGUE-CRACK PROPAGATIONIN AEROSPACE STRUCTURAL COMPONENTS. A FRACTURE ANALYSIS COMPUTATIONAL TOOL WILL BE CREATED USING MODERN ADAPTIVE FINITE ELEMENT TECHNIQUES, EXTRACTION FORMULAS, AND CRACK-PROPAGATION THEORIES. THE CODE WILL BE VIRTUALLY A STAND-ALONE MODULE IN THAT IT WILL REQUIRE NO ADDITIONAL STRUCTURAL MODELING OTHER THAN A DESCRIPTION OF THE MATERIALFLAW. IT WILL BE DEVELOPED AS A POST PROCESSOR TO EXISTING FINITE-ELEMENT PROGRAM PACKAGES. THE FINITE-ELEMENT MODEL OF THE UNFLAWED STRUCTURE WILL BE PREPARED IN THE SAME MANNER AS IS CURRENTLY DONE. FLAWS CAN BE INTRODUCED INTO THESE EXISTING FINITE-ELEMENT MODELS AND THE FRACTURE ANALYSIS PERFORMED IN A MANNER VIRTUALLY TRANSPARENT TO THE USER. WITH VERY LITTLE ADDITIONAL EFFORT THE STRESS ANALYSTCAN THEN PERFORM A FRACTURE-MECHANICS ANALYSIS. PHASE I WILL FOCUS ON SOLUTION-ADAPTIVE ALGORITHM DEVELOPMENT AND WILL UTILIZE STRESS-INTENSITY FACTOR CALCULATIONS FOR FATIGUE-LIFE PREDICTION. PHASE II WILL INCLUDE RESEARCH ANDDEVELOPMENT INTO CONSTITUTIVE THEORIES OF FRACTURE, ACCURATESTRESS RECOVERY PROCEDURES, ADAPTIVE REFINEMENT STRATEGIES, AND DEVELOPMENT AND DELIVERY OF A GENERAL THREE-DIMENSIONAL CODE.

* Information listed above is at the time of submission. *

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