Determination of Local Thermophysical Properties and Heat of Transition from Thermal Fields Measurement During Drop Calorimetric Experiment

Delobelle, Vincent; Favier, Denis; Louche, Hervé; Connesson, Nathanaël

doi:10.1007/s11340-014-9877-z

Cited by 13 publications

(11 citation statements)

References 35 publications

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“…The application to rubber is typical of the relevance of the approach in studying various material responses: [12][13][14][15][16][17] thermoelastic coupling, entropic coupling, thermoelastic inversion, the effect of reinforcement by fillers, strain-induced crystallization, and the Mullins effect. The 0D approach has been also applied to study the thermomechanical response of SMAs under cyclic loading, [7,[18][19][20][21][22] as well as polyamide 6.6, [23][24][25][26][27] aluminum alloy, [28] and steel. [29] However, a difficulty arises for the estimation of mechanical dissipation in the case of long-term cyclic tests: The results are easily skewed by any change in the specimen's environment, such as the ambient air, the grips of the testing machine, and more generally, all the components of the testing room.…”

Section: Introductionmentioning

confidence: 99%

A specific device for enhanced measurement of mechanical dissipation in specimens subjected to long‐term tensile tests in fatigue

Delpueyo

Balandraud

Grédiac

et al. 2017

Strain

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This paper presents a calorimetric approach to the measurement of mechanical dissipation in specimens subjected to cyclic tensile tests. Mechanical dissipation, that is, the heat power produced by the material due to mechanical irreversibility, can potentially be deduced from the temperature changes captured on the specimen surface by infrared thermography. However, a difficulty arises for long-term cyclic tests: Results are easily skewed by any change in the specimen's environment. The problem is amplified by the fact that mechanical dissipation is in general small compared to the heat sources associated with thermomechanical couplings, making its estimation difficult. The paper proposes a simple procedure to extract a well-resolved estimation of mechanical dissipation by solving two key points specific to long-term cyclic tests: (a) the reduction of the parasitic effects associated with changes in the specimen's environment by using a specific device based on two references samples and (b) the choice of relevant thermal data acquisition parameters. A test is performed on a copper-based shape-memory alloy whose calorific response comprises three origins of heat sources: thermoelastic coupling, phase transformation, and mechanical irreversibility. The results obtained demonstrate the relevancy of the approach in extracting mechanical dissipation from the thermal response of the specimen subjected to long-term tensile tests in fatigue.

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Section: Introductionmentioning

confidence: 99%

A specific device for enhanced measurement of mechanical dissipation in specimens subjected to long‐term tensile tests in fatigue

Delpueyo

Balandraud

Grédiac

et al. 2017

Strain

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“…This case is similar to the exothermic heat source that occurs during a thermal induced phase transformation, as in the experimental benchmarks proposed in [15,20]. In [15,20], the NiTi SMA cools from a high temperature where the material is in • Case 2: Fig. 3.b were chosen.…”

Section: Methodsmentioning

confidence: 99%

“…The second one, qualified as "experimental" refers to real problems where temperature and heat sources are quantitatively known. [15,20] proposed a first experimental vali-dation based on the observation of the austenite to R phase transformation occurring in NiTi SMA.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the effect of the paint layer used for infrared thermography on heat source estimation

Delobelle

Louche

Favier

2014

Quantitative InfraRed Thermography Journal

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International audienceThis paper investigates the effect of the paint layer used for infrared thermography on the heat source estimation for thin plates. The thermal behaviour of two plates is studied using finite element modelling. The first one is composed of the studied homogeneous material. The second one is a sandwich plate composed of a central material covered on each side with a high emissivity paint layer. For the two plates, two thermal loading cases are simulated. Case 1 corresponds to natural cooling from a initial uniform temperature to room temperature. Case 2 corresponds to a situation where the initial uniform temperature is equal to room temperature. In both cases, the central material is loaded with internal heat sources leading to temperature field variation. From the computed external surface temperature, heat sources and energy are then estimated using homogeneous plate and sandwich plate models derived from the heat diffusion equation. Then, the estimated heat sources are compared to the one input in the finite element model. It is shown that the paint layer significantly isolates the central material from the external environment. In case 1, it is shown that the error is reduced from 10% with the homogeneous plate model to 5%, with the sandwich plate model. In case 2, heat sources are estimated with an error of less than 8% with the homogeneous plate model while it is below 2% with the sandwich plate model. The sandwich plate model is thus significantly more accurate for heat source and energy estimations than the homogeneous plate model

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“…For this purpose, temperature fields are acquired using an infrared thermal camera. This method for heat source quantification using infrared technique was validated by authors in [19,20,21] in a NiTi tube and plate showing typical DSC results, i.e. well-defined transformation peaks.…”

Section: Introductionmentioning

confidence: 96%

Specific forward/reverse latent heat and martensite fraction measurement during superelastic deformation of nanostructured NiTi wires

Oliveira

Louche²,

Grassi

et al. 2020

Materials Science and Engineering: A

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This study analyses the thermomechanical tensile behaviour of a cold drawn Ti-50.9at.%Ni wire submitted to heat treatment at 598 K for 30 min, which is below the recrystallization temperature (623 K). Such low temperature heat treatment induces a superelastic loop without a stress "plateau". However, the absence or weakness of peaks on its differential scanning calorimetry prevents the determination of specific latent heat. This is a common effect of nanostructured materials such as superelastic wires. A method using strain and temperature field measurements was developed and used to determine thermal power and thermal energy during superelastic tensile tests through a heat balance. From these results and using a thermodynamic approach, forward and reverse specific latent heat and the martensite fraction are estimated as a function of strain and stress.

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Determination of Local Thermophysical Properties and Heat of Transition from Thermal Fields Measurement During Drop Calorimetric Experiment

Cited by 13 publications

References 35 publications

A specific device for enhanced measurement of mechanical dissipation in specimens subjected to long‐term tensile tests in fatigue

A specific device for enhanced measurement of mechanical dissipation in specimens subjected to long‐term tensile tests in fatigue

Numerical study on the effect of the paint layer used for infrared thermography on heat source estimation

Specific forward/reverse latent heat and martensite fraction measurement during superelastic deformation of nanostructured NiTi wires

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