Dependence of thermoelastic effect on volume change by elastic deformation

Jandrlić, Ivan; Rešković, Stoja; Vodopivec, F.; Lava, Pascal

doi:10.1007/s12540-016-5467-1

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…Considering the energy and entropy balance equations during tensile loading, in theory it is assumed that there is no additional work other than the elastic stretching and that the volume of the material does not change in the elastic regime and the length change is compensated for by the change in cross-sectional area. 50 In the infrared images, no notable features are visible on the surface and temperature is uniformly distributed across the surface in the elastic regime. From the wall thickness measurements, the 0.50 strain curve show the highest cumulative distribution between t x for thickness <10 µm, and this strain of 0.50 corresponds to the end of the linear elastic regime, and at this stage, to compensate for thermoelastic effects, the relative increase in length is compensated by volume change.…”

Section: Discussionmentioning

confidence: 96%

“…From the wall thickness measurements, the 0.50 strain curve show the highest cumulative distribution between t x for thickness <10 µm, and this strain of 0.50 corresponds to the end of the linear elastic regime, and at this stage, to compensate for thermoelastic effects, the relative increase in length is compensated by volume change. 50 From the XCT data, it is visualized in images (1–2) of Figure 5 that larger pores remain the same sizes and there is no visible damage to the microstructure in the elastic regime (strains <0.10normal ±normal 0.04). In this range of strain, it is observed from Figure 8(a) that all pore sizes do not undergo deformation, but there is a slight increase in the porosity.…”

Section: Discussionmentioning

confidence: 99%

“…The surface temperature decrease under uniaxial tension within the elastic strain limits is caused due to the thermoelastic effect, which is well described in existing literature. 50,51 In any deforming structure with a positive coefficient of thermal expansion, the strain field causes a change in the internal energy of the specimen such that compressed region becomes hotter and the expanded region becomes cooler and the mechanism responsible for thermoelastic effect is the lack of thermal equilibrium between various parts of the deforming structure. Considering the energy and entropy balance equations during tensile loading, in theory it is assumed that there is no additional work other than the elastic stretching and that the volume of the material does not change in the elastic regime and the length change is compensated for by the change in cross-sectional area.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Quasistatic response of a shear-thickening foam: Microstructure evolution and infrared thermography

Bhagavathula

Parcon

Azar

et al. 2020

Journal of Cellular Plastics

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In this work, the authors study the thermo-mechanical response of a dilatant polymeric foam in quasistatic tension and compression, focusing on the links between microstructure, mechanical response, and associated temperature rises in these materials. The authors study these links for a commercially-available shear-thickening foam, named D3O LITE D. Samples were tested under quasi-static conditions for a strain rate of 0.1 s−1 in tension and compression. Micro X-ray computed tomography (XCT) was used to study the evolution of microstructure (pore size and wall thickness) as a function of strain and this was achieved by developing MATLAB-based programs to analyze these microstructural features. The foam specimens were loaded until failure which allowed for the investigation of the elastic, inelastic, and failure regimes. From the XCT images, pore stretching and cell wall tearing are observed in tension, and buckling and pore collapse are observed in compression. These mechanisms are studied in-situ using an infrared thermal camera which record temperature profiles, and temperature measurements are linked back to stress-strain, and temperature-strain responses. For this material, the tensile yield stress was 0.57 ± 0.10 MPa and the elastic modulus was 5.47 ± 0.10 MPa respectively, at a yield strain of 0.10 ± 0.04. At the time of failure, the average temperature of the specimen was found to increase by ∼3.00°C and a local temperature increase of ∼8.00°C was observed in the failure region. In compression, the elastic collapse stress and elastic modulus were found to be 0.130 ± 0.016 MPa and 2.5 ± 0.2 MPa, respectively. The temperature increase in compression at ∼0.83 strain was ∼0.65°C. These results represent some of the first mechanical properties on shear-thickening foams in the literature, and the discoveries on the linkages between the microstructure and the mechanical properties in this study are important for researchers in materials design and modelling.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Quasistatic response of a shear-thickening foam: Microstructure evolution and infrared thermography

Bhagavathula

Parcon

Azar

et al. 2020

Journal of Cellular Plastics

View full text Add to dashboard Cite

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“…Mainly optical temperature measurement by means of infrared and thermistors [14,15], but also thermocouples [16] were used for measurement. There are results for a variety of materials including aluminum [17], stainless steel [18,19] and low carbon steel [20]. The effect has been demonstrated for the materials, but a comprehensive study of the effect and its potential for material characterization is still missing.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Factors Influencing the Determination of the Onset of Yielding by Temperature Measurement

Vitzthum

Gruber

Rebelo-Kornmeier

et al. 2022

KEM

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The cooling of the material during elastic tensile loading is well known as the thermoelastic effect. It is already known that the temperature minimum at the elastic-plastic transition can be used for the determination of the onset of yielding. Conceivable parameters for this have already been presented and investigated. Within this study factors influencing the specimen temperature during tensile loading and unloading are experimentally analyzed to improve the determination approach and the understanding of it. Furthermore, the robustness and repeatability of the measurement and evaluation procedures are analyzed. Therefore, cyclic tensile tests with the mild steel DC06 and the high strength steel CR590Y980T (DP1000) are performed with four PT1000 sensors applied on the specimen. The temperature behavior during elastic loading, elastic-plastic elongation and elastic unloading is separately evaluated. Different strain rates are investigated to better understand the strain-dependent heat development and its influence on the temperature-dependent evaluation. In this way, correlations between strain rate and thermal conduction due to prevailing temperature differences are found and their influence on the temperature-based determination of the onset of yielding is analyzed. Therefore, the yield stress at temperature minimum YSTmin as well as an additional yield stress at zero plastic strain YS0 are evaluated for all experiment settings. In a comprehensive experimental study, the standard deviations are compared and thus conclusions can be drawn about the robustness of the determination methods.

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