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S24 Mecânica dos Sólidos |
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Title:
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DETERMINATION OF STRESSES IN PLATES USING ULTRASONIC SHEAR WAVES
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Summary :
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ABSTRACT. FABRICATION PROCESSES OR EVENTS IN SERVICE MAY CAUSE RESIDUAL STRESSES. MOST OF THE METHODS FOR DETERMINATION OF RESIDUAL STRESSES INSIDE METALLIC SOLIDS ARE DESTRUCTIVE AND IT IS UNDESIRABLE THAT THE SPECIMEN BE DESTROYED AFTER TESTING FOR STRESS ANALYSIS. THE ULTRASONIC TECHNIQUE PROVIDES AN USEFUL NONDESTRUCTIVE TOOL IN THE EVALUATION OF STRESSES. IN BODIES UNDER TRACTION THIS TECHNIQUE CAN BE USED TO PREVENT CATASTROPHIC FAILURE IN PRESSURE VESSELS AND BRIDGES OR RAILROAD WHEELS. THIS WORK PRESENTS THE APPLICATION OF SHEAR WAVES IN THE DETERMINATION OF THE STRESS STATE IN A FRAME MADE OF STEEL PLATES. TWO FIXTURES ARE USED IN THE RESEARCH: AN ARRANGEMENT COMPOSED OF TWO PLATES FITTED TOGETHER AND A BAR STRESSED BY A HYDRAULIC SYSTEM SIMULATING THE TENSILE STRESS. A FINITE ELEMENT MODEL WAS USED TO CALCULATE STRESS DISTRIBUTION IN THE FORMER AND MANUAL CALCULATIONS IN THE LATER. THE COMPARISON BETWEEN THE THEORETIC AND EXPERIMENTAL RESULTS SHOWS THAT IT IS POSSIBLE TO IDENTIFY THE TENSILE AND COMPRESSIVE REGIONS INSIDE THE PLATES USING THIS SYSTEM, AND TO PROVIDE A VALUABLE NONDESTRUCTIVE WAY TO EVALUATE STRESSES IN MECHANICAL COMPONENTS.
KEYWORDS: ULTRASONIC TECHNIQUES, NONDESTRUCTIVE STRESS MEASUREMENTS, SHEAR WAVES.
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Author :
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Bray, Don E.
Kypa, Jagan M. R.
Santos, Auteliano Antunes
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Paper View :
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