Search results for "Stress measurement"

showing 3 items of 3 documents

Measuring Multiple Residual-Stress Components using the Contour Method and Multiple Cuts

2009

The conventional contour method determines one component of residual stress over the cross section of a part. The part is cut into two, the contour (topographic shape) of the exposed surface is measured, and Bueckner’s superposition principle is analytically applied to calculate stresses. In this paper, the contour method is extended to the measurement of multiple residual-stress components by making multiple cuts with subsequent applications of superposition. The theory and limitations are described. The theory is experimentally tested on a 316L stainless steel disk with residual stresses induced by plastically indenting the central portion of the disk. The multiple-cut contour method resu…

Surface (mathematics)Mathematical modelResidual stress measurement - Contour method - Multiaxial stress - Neutron diffraction - Bueckner’s principle - Finite element methodbusiness.industryMechanical EngineeringAerospace EngineeringGeometryStructural engineeringFinite element methodCross section (geometry)Settore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineSuperposition principleMechanics of MaterialsResidual stressIndentationSolid mechanicsbusinessMathematicsExperimental Mechanics
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A new technique for partial discharges measurement under DC periodic stress

2017

The aim of the present work is to recognize the type of defect in insulating materials employed in DC electrical systems. This analysis, under AC stress, is carried out by using the Phase Resolved method (PRPD). While, under constant voltage stress this method cannot be performed and measurements show complexities. In order to overcome these problems, a new technique is proposed, based on the application of a periodic continuous waveform. Simulation results, carried out by using a model based on a time-variable conductance of an air void defect, showed the PRPD pattern that can be obtain. Furthermore, compared to the constant DC stress, the measurement duration became lower and the discharg…

010302 applied physicsVoid (astronomy)Materials scienceHVDCElectronic Optical and Magnetic MaterialConductanceStress measurementMechanicsDC stre01 natural sciencesSpace chargeSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaSettore ING-IND/31 - ElettrotecnicaPartial discharge0103 physical sciencesWaveformConstant voltagePRPD patternElectrical and Electronic Engineering010306 general physics
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A digital device for the diagnosis of insulation systems

2004

A complete innovative measurement system (D2SI - device for the diagnosis of insulation systems) for both acquisition, analysis and processing of partial discharge signals generated in insulation systems under voltage stress (IEC standard), was designed and realized; several measurements on practical insulation systems demonstrated the full and correct equipment operation.

Stress (mechanics)EngineeringDigital devicebusiness.industrySystem of measurementPartial dischargeElectrical engineeringDielectrics and electrical insulation Partial discharge measurement Stress measurement Signal analysis Partial discharges Signal processing Signal generators Voltage IEC standards Signal designIec standardsbusinessVoltageThe 17th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2004. LEOS 2004.
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