Experimental estimation of the heat energy dissipated in a volume surrounding the tip of a fatigue crack

Meneghetti, Giovanni; Ricotta, Mauro

doi:10.3221/igf-esis.35.20

Cited by 3 publications

(3 citation statements)

References 18 publications

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“…3 The results of the study One of the ways to determine the occurrence of defects in both bearings and gears is thermal monitoring. The use of the thermal monitoring is widely known, and is successfully used for diagnostic purposes [12,13].…”

Section: Formulation Of the Problemmentioning

confidence: 99%

Criteria Justification for Assessing the Technical Condition of Gearboxes of Mining Machines Based on Infrared Thermography

2020

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The paper presents the relevance of advanced assessment of the technical condition of complex technical systems. One of which is the gearbox of a mining machine. The main reasons for early failures of bearings are shown. The main share is occupied by problems of lubrication, incorrect installation and maintenance. The analysis of types of destruction of gears of mining machines is presented. The main share is occupied by the surface coloring of the teeth and sudden fracture of the tooth as a result of dynamic load. The theoretical basis for determining the heat release of bearings is given. The calculation of heat release is given of a shaft belt conveyor gearbox as an example, which is confirmed by thermographic studies under operating conditions. Justification of criteria for evaluating the technical condition of gearboxes of mining machines in the form of temperature anomalies recorded on the surface of the body, The actual load on the output shaft is taken into account.

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Section: Formulation Of the Problemmentioning

confidence: 99%

Criteria Justification for Assessing the Technical Condition of Gearboxes of Mining Machines Based on Infrared Thermography

2020

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“…1(a)). The details of the fatigue tests are reported in [12][13][14][15][16][17]. The specific heat loss per cycle can be evaluated in situ during a fatigue test by means of Eqn.…”

Section: Introductionmentioning

confidence: 99%

Crack paths in multiaxial fatigue of C45 steel specimens and correlation of lifetime with the thermal energy dissipation

Rigon

Berto

Meneghetti

2021

Frattura Ed Integrità Strutturale

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The work deals with the analysis of the multiaxial fatigue damage of a C45 steel and its relationship with the thermal energy dissipation used in the last decades to estimate the uniaxial fatigue behavior of metals. For this purpose, thin-walled samples made of quenched and tempered C45 steel were tested under completely reversed combined axial and torsional cyclic loadings with different biaxiality ratios and phase-shift angles. The analyses of the crack paths at the initiation of the failure were performed after a 50% of stiffness loss that corresponded to a crack size ranging from 10 to 20 mm; afterwards, the characteristic crack paths of each loading condition were analysed by using a digital microscope to identify the direction of the crack at the initiation. The fatigue crack initiation points were inspected using a Scanning Electron Microscope after having broken under static tensile loading all specimens previously tested under fatigue. The specific heat loss per cycle was measured during the fatigue tests by applying the cooling gradient technique. Nevertheless, the fatigue damages observed are dependent on the load condition, the Q parameter was able to collapse all the axial, torsional and multiaxial fatigue test results in a sole scatter band

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“…More precisely, in case of blunt notches, the specific heat loss has been evaluated at a point of a specimen (Q), i.e. at the notch tip; in case of severe V-notches or cracks, the specific heat loss has been averaged in a control volume of material surrounding the tip of the stress raiser (Q*) as proposed in [20,21]. In [16,18], thermocouples having wires of 0.127 mm in diameter were attached at the notch tip, by using 1.5-2 mm silverloaded glue dot diameter.…”

Section: Introductionmentioning

confidence: 99%

Analysis of dissipated energy and temperature fields at severe notches of AISI 304L stainless steel specimens

Rigon

Ricotta

Meneghetti

2018

Frattura Ed Integrità Strutturale

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In the last years, a large amount of fatigue test results from plain and bluntly notched specimens made of AISI 304L stainless steel were synthetized in a single scatter band by adopting the specific heat loss per cycle (Q) as a damage parameter. During a fatigue test, the Q parameter can be evaluated measuring the cooling gradient at a point of the specimens after having suddenly stopped the fatigue test. This measurement can be done by using thermocouples; however, due to the high stress concentration at the tip of severely notched components analysed in the present paper, an infrared camera achieving a much improved spatial resolution was adopted. A data processing technique is presented to investigate the heat energy distribution close to the notch tip of hot-rolled AISI 304L stainless steel specimens, having notch tip radii equal to 3, 1 and 0.5 mm and subjected to constant amplitude cyclic loads. A thermal finite element analysis was also performed by assigning heat generation in the appropriate region close to the notch tip. Then the numerical temperature values were compared with the experimental measurement.

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Experimental estimation of the heat energy dissipated in a volume surrounding the tip of a fatigue crack

Cited by 3 publications

References 18 publications

Criteria Justification for Assessing the Technical Condition of Gearboxes of Mining Machines Based on Infrared Thermography

Criteria Justification for Assessing the Technical Condition of Gearboxes of Mining Machines Based on Infrared Thermography

Crack paths in multiaxial fatigue of C45 steel specimens and correlation of lifetime with the thermal energy dissipation

Analysis of dissipated energy and temperature fields at severe notches of AISI 304L stainless steel specimens

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