Fatigue life gaging methods
First Claim
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1. THE METHOD OF MEASURING THE CUMULATIVE FATIGUE DAMAGE AT AN AREA ON A STRUCTURE WHICH IS SUBJECTED TO REPEATED LOADING COMPRISING THE STEPS OF MOUNTING A GRID OF CONDUCTIVE MATERIAL ON THE STRUCTURE TO BE TESTED SO THAT STRAINS IN THE TEST STRUCTURE ARE TRANSMITTED TO THE GRID, SUBJECTING THE STRUCTURE TO REPEATED LOADING WHICH CAUSES A PERMANENT AND FINITE CHANGE IN THE ELECTRICAL RESISTANCE OF THE GRID, MEASURING THE CHANGE IN THE RESISTANCE OF THE GRID, AND DETERMINING THE FATIGUE LIFE OF THE STRUCTURE BY COMPARING THE CHANGE IN RESISTANCE WITH FATIGUE LIFE DATA ON THE GRID MATERIAL OBTAINED UNDER KNOWN CONDITIONS.
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1 Claim
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1. THE METHOD OF MEASURING THE CUMULATIVE FATIGUE DAMAGE AT AN AREA ON A STRUCTURE WHICH IS SUBJECTED TO REPEATED LOADING COMPRISING THE STEPS OF MOUNTING A GRID OF CONDUCTIVE MATERIAL ON THE STRUCTURE TO BE TESTED SO THAT STRAINS IN THE TEST STRUCTURE ARE TRANSMITTED TO THE GRID, SUBJECTING THE STRUCTURE TO REPEATED LOADING WHICH CAUSES A PERMANENT AND FINITE CHANGE IN THE ELECTRICAL RESISTANCE OF THE GRID, MEASURING THE CHANGE IN THE RESISTANCE OF THE GRID, AND DETERMINING THE FATIGUE LIFE OF THE STRUCTURE BY COMPARING THE CHANGE IN RESISTANCE WITH FATIGUE LIFE DATA ON THE GRID MATERIAL OBTAINED UNDER KNOWN CONDITIONS.
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Current AssigneeDarrell R. Harting
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Original AssigneeDarrell R. Harting
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InventorsHarting, Darrell R.
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Application NumberUS04/340,331Time in Patent Office960 DaysField of SearchUS Class Current73/775CPC Class CodesG01L 1/2206 Special supports with prese...G01N 2203/0073 FatigueG01N 2203/0222 TemperatureG01N 3/066 with electrical indicating ...
