System and Method for Fatigue Forecasting and Strain Measurement Using Integral Strain Gauge (ISG)
First Claim
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1. Method of measurement stress-strain and life time prediction within a test object including following elements and procedural steps:
- at least one Integral Strain Gauge (ISG) whereas creation of said gauge chosen to enhance sensitivity of the plain of the said gauge selected based on the mechanical properties of a tested element;
attachment of the said gauge on the surface of the tested element allowing transmission of stress reaction and further recording of said reaction on the surface of the ISG;
calibration tests of an ISG incorporate attachment of the ISG on the surface of a specimen, stress loading of the specimen and the reaction reading for the purpose of creation of calibration dependency in a form of mathematical equation;
creation of a fatigue curve incorporates attachment of an ISG on the surface of the tested element, stress loading of the sample till the point of destruction and the reaction reading for the purpose of creation of fatigue curve in a form of mathematical equation;
life time prediction incorporates attachment of an ISG on the surface of the tested element and reaction reading pertaining the maximum strain level recorded on the surface of the ISG and subsequent calculation of number of cycles prior to part'"'"'s destruction.
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Abstract
The present invention relates to means, system and method for measurement of stress strain and fatigue forecasting by the means of Integral Strain Gauges (ISGs) capable of recording information from a surface of a tested object, mathematical processor for analysis of the information recorded on the surface of such gauges. Integral Strain Gauges produced from a custom made reaction sensitive materials.
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Citations
13 Claims
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1. Method of measurement stress-strain and life time prediction within a test object including following elements and procedural steps:
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at least one Integral Strain Gauge (ISG) whereas creation of said gauge chosen to enhance sensitivity of the plain of the said gauge selected based on the mechanical properties of a tested element; attachment of the said gauge on the surface of the tested element allowing transmission of stress reaction and further recording of said reaction on the surface of the ISG; calibration tests of an ISG incorporate attachment of the ISG on the surface of a specimen, stress loading of the specimen and the reaction reading for the purpose of creation of calibration dependency in a form of mathematical equation; creation of a fatigue curve incorporates attachment of an ISG on the surface of the tested element, stress loading of the sample till the point of destruction and the reaction reading for the purpose of creation of fatigue curve in a form of mathematical equation; life time prediction incorporates attachment of an ISG on the surface of the tested element and reaction reading pertaining the maximum strain level recorded on the surface of the ISG and subsequent calculation of number of cycles prior to part'"'"'s destruction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
and is explicitly defined in the equation of
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8. Creation of a fatigue curve as set forth in claim 1, includes stress loading of elements on multiple levels of strain conducted till the final destruction of elements on each level of said strains where the number of cycles prior to sample destruction and corresponding ISG reaction is recorded for each trial.
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9. Fatigue curve as set forth in claim 8, is created based on the computational analysis of the calibration dependency, values of the shear deformation that corresponds to the maximum level of intensity of the reaction recorded on the surface of the ISG.
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10. Fatigue curve as set forth in claim 8, is explicitly defined as a dependency having a number of variable parameters including number of cycles prior to parts destruction, maximum magnitude of micro-level strains, constants of the calibration dependency, constants pertaining mechanical properties of the tested element.
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11. Life time prediction stage as set forth in claim 1 incorporates reading of maximum intensity reaction from the surface of the ISG attached to the surface of a tested sample, recording of the number of cycles preceding said reaction, engagement of a curve of the calibration dependency coordinates corresponding to the said reaction, and subsequent resolution for the finite number of cycles prior to destruction of the tested sample having the sample subjected to a constant level of strain and predetermined number of cycles.
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12. Life time prediction stage as set forth in claim 1 incorporates reading of maximum intensity reaction from a surface of the ISG attached to a tested sample following block stages, computation of a number of cycles of loading corresponding to a present stage of a block loading, computation of values of a maximum strain and subsequent resolution for the finite number of cycles prior to destruction of a tested sample by substitution to an equation of a fatigue curve having the level of strain changing according to a set block of loads and a predetermined number of blocks phases.
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13. Life time prediction stage as set forth in claim 1 incorporates reading of maximum intensity reaction from a surface of the ISGs of a variable sensitivity attached to a tested object, recording timings of appearance of reaction of a similar intensity, correlating such timings to a number of cycles of loading, solving the system of equations for a value of a maximum strain and subsequent resolution for the finite number of cycles prior to destruction of a tested element by substitution to an equation of a fatigue curve having the level of strain and the corresponding number of cycles is changing in random.
Specification