Thermoelastic stress analysis under nonadiabatic conditions

Offermann, S.; Beaudoin, Jean Louis; Bissieux, C.; Frick, Hans

doi:10.1007/bf02317306

Cited by 46 publications

(24 citation statements)

References 7 publications

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“…research has been done on the stress-pattern analysis by the The present state of the material is characterized by the characteristic evolution of temperature under either adiabatic independent observable state variables, including a total or nonadiabatic conditions. [15,16,17] Fatigue of materials, as a complicated process of gradual strain, (or stress), absolute temperature, temperature gradient …”

Section: Simplifications Andmentioning

confidence: 99%

“…[16] and [17], respectively: process, the stress and strain can return to their initial stages, and the hysteresis loop is a closed loop at a later stage Ż I ϭ m 1 (Z 1 Ϫ Z I )Ẇ p ; Z I (0) ϭ Z 0 [16] of cyclic loading. This anelastic behavior is geometrically reversible, but thermodynamically irreversible due to the Ż D ϭ m 2 2 (1ϩexp(Ϫm 3 Z D ))(Z 2 ϪZ D )Ẇ p ; Z D (0)ϭ0 [17] energy loss of the hysteresis loop. From Eq.…”

Section: A Temperature Evolutionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of the temperature evolution during high-cycle fatigue of the ULTIMET superalloy: Experiment and theoretical modeling

Jiang

Wang

Liaw

et al. 2001

Metall Mater Trans A

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High-speed, high-resolution infrared thermography, as a noncontact, full-field, and nondestructive technique, was used to study the temperature variations of a cobalt-based ULTIMET alloy subjected to high-cycle fatigue. During each fatigue cycle, the temperature oscillations, which were due to the thermal-elastic-plastic effects, were observed and related to stress-strain analyses. A constitutive model was developed for predicting the thermal and mechanical responses of the ULTIMET alloy subjected to cyclic deformation. The model was constructed in light of internal-state variables, which were developed to characterize the inelastic strain of the material during cyclic loading. The predicted stress-strain and temperature responses were found to be in good agreement with the experimental results. In addition, the change of temperature during fatigue was employed to reveal the accumulation of fatigue damage, and the measured temperature was utilized as an index for fatigue-life prediction.

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Section: Simplifications Andmentioning

confidence: 99%

Section: A Temperature Evolutionmentioning

confidence: 99%

Characterization of the temperature evolution during high-cycle fatigue of the ULTIMET superalloy: Experiment and theoretical modeling

Jiang

Wang

Liaw

et al. 2001

Metall Mater Trans A

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“…Because of the low thermal diffusivity D of the material under study compared with metallic and polymer materials (see Table 2), this frequency is assumed to be high enough to achieve adiabatic conditions within the specimens. Indeed, the thermal diffusion length D/(π f L ) for f L =7 Hz is equal to 0.22 mm [28], which can be assumed lower than the spatial variations of stress. Beside, this length is nearly equal to the spatial resolution of the thermal measurement (0.18 mm, see below).…”

Section: Loadings and Measurementsmentioning

confidence: 99%

Experimental Evidence of Thermal Effects in Multiphase Ceramic Specimens Subjected to Cyclic Loading

et al. 2009

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International audienceThe aim of this work is to observe and to analyze various phenomena that exist in a multiphase ceramic material subjected to cyclic compressive loads. An infrared camera is used for this purpose. The material under study is an andalusite-based low-cement castable, which exhibits a pre-existing diffused damage (microcracks and debonded interfaces) before mechanical testing. The temperature variation in the specimen during the tests is investigated both at a macroscopic scale and a mesoscopic scale. In the first case, the material compaction, the thermoelastic coupling and the temperature increase due to mechanical dissipation are clearly evidenced. In the second case, local temperature variations related to microcracks are observed. The technique used and the results obtained are described and discussed in the paper

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“…The test bench, equipped with the hydraulic shaker, generates a cyclical load on the frame which has been painted with a dull black paint, in order to make uniform the thermal emissivity of the body (Grigg et al, 2000;Lesniak et al, 2013;Offermann et al, 1997;Speranzini et al, 2014). An electrical strain gauge has been pasted on the frame to convert the thermographic frame into a stress frame, as well as to generate the reference signal necessary to the TSA system, to synchronize the frame grabber with the dynamic cycle load.…”

Section: Ferrari Car Frame Analysismentioning

confidence: 99%

TSA infrared measurements for stress distribution on car elements

Marsili

Rossi

2017

J. Sens. Sens. Syst.

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Abstract. Because of the continuous evolution of the market in terms of quality and performance, the car production industry is being subjected to more and more pressing technological challenges. In this framework the use of an advanced measurement technique such as thermoelasticity allows the engineers to have a fast and reliable tool for experimental investigation, optimization and validation of the finite element method (FEM) of those critical parts, such as parts of car-frame tables (Marsili and Garinei, 2013;Ju et al., 1997). In this work it is shown how the thermoelastic measurement technique can be used to optimize a Ferrari car frame, as a method of experimental investigation and as a technique of validation of numerical models.The measurement technique developed for this purpose is described together with the calibration method used in the test benches normally used for fatigue testing and qualification of this car's components. The results obtained show a very good agreement with FEM models and also the possibility of experimentally identifying the concentration levels of stress in critical parts with a very high spatial resolution and testing the effective geometry and material structure.

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Thermoelastic stress analysis under nonadiabatic conditions

Cited by 46 publications

References 7 publications

Characterization of the temperature evolution during high-cycle fatigue of the ULTIMET superalloy: Experiment and theoretical modeling

Characterization of the temperature evolution during high-cycle fatigue of the ULTIMET superalloy: Experiment and theoretical modeling

Experimental Evidence of Thermal Effects in Multiphase Ceramic Specimens Subjected to Cyclic Loading

TSA infrared measurements for stress distribution on car elements

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