0000000000225778

AUTHOR

Mauro Ricotta

showing 4 related works from this author

Investigation of the crack tip stress field in a stainless steel SENT specimen by means of Thermoelastic Stress Analysis

2019

Abstract In this work a Thermoelastic Stress Analysis (TSA) setup is implemented to investigates the Thermoelastic and Second Harmonic signals on a fatigue loaded Single Edge Notched Tension (SENT) specimen made of stainless steel AISI 304L. Three load ratios are in particular applied, R=-1, 0, 0.1. The thermoelastic signal is used to evaluate the Stress Intensity Factor via two approaches, the Stanley-Chan linear interpolation method and the over-deterministic least-square fitting (LSF) method using the Williams’ series expansion. Regarding least-square fitting, an iterative procedure is proposed to identify the optimal crack tip position in the thermoelastic maps. The SIF and T-Stress are…

Materials scienceTension (physics)02 engineering and technologyMechanicsLinear interpolation021001 nanoscience & nanotechnologyStress (mechanics)Stress fieldT-StressSettore ING-IND/14 - Progettazione Meccanica E Costruzione Di Macchine020303 mechanical engineering & transportsThermoelastic damping0203 mechanical engineeringStress Intensity FactorHarmonicThermoelastic Stress Analysis Least Square Fitting Stress Intensity Factor Crack Closure T-StressThermoelastic Stress AnalysisLeast Square Fitting0210 nano-technologySeries expansionStress intensity factorCrack ClosureEarth-Surface Processes
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On the correlation of temperature harmonic content with energy dissipation in C45 steel samples under fatigue loading

2022

Fatigue damage onset involves a transformation of mechanical energy. This is in part spent into work of plastic deformation and fracture and in part transformed into heat. Therefore, different thermomechanical heat sources are activated during a fatigue loading cycle, resulting in a temperature modulation that can be characterized by its frequency content. Several studies have monitored the temperature on samples undergoing high-cycle fatigue, measuring specific thermomechanical metrics which could serve as indicators of damage evolution. The present work evaluates the harmonic content of temperature, to investigate its correlation with the material dissipation. The harmonic terms investiga…

ThermomechanicsSettore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineThermomechanics; Fatigue; Dissipative heat sources; Thermoelastic effect; Frequency domain analysisMechanics of MaterialsThermoelastic effectFrequency domain analysisDissipative heat sourcesGeneral Materials ScienceInstrumentationFatigueMechanics of Materials
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On relation between J-integral and heat energy dissipation at the crack tip in stainless steel specimens

2019

In this paper, an experimental procedure to evaluate the elastic-plastic J-integral at the tip of a fatigue crack is presented. According to this new approach, the elastic component of the J-integral is derived from Thermoelastic Stress Analysis, while the plastic component of the J-integral is derived from the heat energy loss. An analytical link is proposed to apply this new experimental technique. Therefore, the elastic-plastic J-integral range was evaluated starting from infrared temperature maps measured in situ during crack propagation tests of AISI 304L stainless steel specimens. It was found that the range of the infrared thermography-based J-integral correlated well the crack growt…

J-integralMaterials scienceInfraredCrack tip plasticityMechanical EngineeringFracture Mechanicslcsh:Mechanical engineering and machineryEnergy methodlcsh:TA630-695Fracture mechanicslcsh:Structural engineering (General)DissipationFracture MechanicFinite element methodStress (mechanics)Settore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineEnergy methodsThermoelastic dampingMechanics of MaterialsCrack tip plasticity; Energy methods; Fracture Mechanics; J-integral; Thermoelastic Stress AnalysisThermographyRange (statistics)Thermoelastic Stress Analysislcsh:TJ1-1570Composite materialFrattura ed Integrità Strutturale
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Infrared thermography-based evaluation of the elastic-plastic J-integral to correlate fatigue crack growth data of a stainless steel

2019

Abstract The elastic-plastic J-integral is adopted to correlate fatigue crack growth data of ductile metals. An analytical link is known to exist between the J-integral and the strain energy density averaged in a control volume embracing the crack tip. On the other hand, the strain energy fluctuation is the source of temperature variations close to a fatigue crack tip of a metal material; hence the possibility to measure the J-integral from infrared thermographic scanning at the crack tip is envisaged and it is the focus of this paper. It is proposed that the elastic component of the J-integral is derived from a thermoelastic stress analysis, while the plastic component of the J-integral is…

Materials scienceFracture mechanic02 engineering and technologyIndustrial and Manufacturing EngineeringStrain energyStress (mechanics)Thermoelastic damping0203 mechanical engineeringThermoelastic Stress AnalysisGeneral Materials ScienceComposite materialFatigueJ-integralCrack tip plasticityMechanical EngineeringEnergy methodTemperatureStrain energy density functionFracture mechanicsParis' law021001 nanoscience & nanotechnologyFinite element method020303 mechanical engineering & transportsMechanics of MaterialsModeling and SimulationFracture mechanics Crack tip plasticity Thermoelastic Stress Analysis Energy methods Fatigue Temperature J-integralThermography0210 nano-technology
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