Stress Network Analysis of 2D Non-Cohesive Polydisperse Granular Materials using Infrared Thermography

Chaiamarit, C.; Balandraud, Xavier; Preechawuttipong, Itthichai; Grédiac, Michel

doi:10.1007/s11340-014-9975-y

Cited by 9 publications

(10 citation statements)

References 35 publications

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“…[35]orin the last figure in Ref. [34]. For the present study dealing with a Bcomposite^assembly, the combination of two different materials and two different diameters led to a monodisperse-like response in terms of particle displacements.…”

Section: Preliminary Observationsmentioning

confidence: 63%

“…In particular, a strong thermal response was observed in the stress concentration areas of the TPU cylinders in the contact zones. Previous studies performed with only isentropic materials [34][35][36]affordedusananalysiswithin the Thermoelastic Stress Analysis framework, but the methodology required restrictive loading conditions (high loading frequency and numerous mechanical cycles for the processing). It is worth noting that the loading signal applied in the present study does not require a specific testing machine in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…POM is much more rigid than TPU (tensile elastic modulus ratio of about 700). In terms of thermoelastic coupling, within the range of mechanical loading considered for the study at ambient temperature, POM is governed by isentropic coupling [34][35][36] while TPU is governed by entropic coupling [59,60]. The material density and specific heat of TPU at 20°C were equal to 1040 kg/m 3 and 1470 J/(kg.K), respectively.…”

Section: Background On Thermoelastic Couplingsmentioning

confidence: 99%

“…The material density and specific heat of TPU at 20°C were equal to 1040 kg/m 3 and 1470 J/(kg.K), respectively. The POM cylinders were similar to those used in our previous studies [34][35][36]: density of 1420 kg/m 3 , specific heat of 1460 J/ (kg.K). The thermal diffusivities of TPU and POM were estimated at 0.13E-6 m 2 /s and 0.16E-6 m 2 /s respectively.…”

Section: Background On Thermoelastic Couplingsmentioning

confidence: 99%

“…The first studies were performed on soils and sands in the framework of vibrothermography [32,33]. In previous works [34][35][36], we studied Schneebeli analogue materials [37] through a socalled Thermoelastic Stress Analysis (TSA) [38][39][40]. However, the amplitudes of the thermal signal were weak due to the use of materials featuring Bclassical^thermoelastic coupling, which is sometimes named isentropic coupling [41].…”

Section: Introductionmentioning

confidence: 99%

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Thermoelastic Couplings and Interparticle Friction Evidenced by Infrared Thermography in Granular Materials

et al. 2018

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Infrared (IR) thermography was used to analyze the thermomechanical response of a two-dimensional non-cohesive granular assembly. Two constitutive materials with different types of thermoelasticity were chosen: thermoplastic polyurethane (TPU) and polyoxymethylene (POM), which feature entropic and isentropic elasticity respectively. Cylinders of each material were mixed together. Analysis was performed under confined compression at two observation scales. Thermoelastic couplings and interparticle friction were separately evidenced. First, the strong thermal effect of entropic coupling was revealed at the contacts, in the stress concentration zones. Second, image processing enabled us to clearly extract the thermal signature of the interparticle friction zone, a quantity that cannot be identified by the other full-field measurement techniques available today. It can thus be claimed that IR thermography provides two distinct routes for the analysis of granular materials by distinguishing the reversible and irreversible parts from the global thermomechanical response. The study also opens prospects for the experimental analysis of Bsoft^granular media.

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Section: Preliminary Observationsmentioning

confidence: 63%

Section: Resultsmentioning

confidence: 99%

Section: Background On Thermoelastic Couplingsmentioning

confidence: 99%

Section: Background On Thermoelastic Couplingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermoelastic Couplings and Interparticle Friction Evidenced by Infrared Thermography in Granular Materials

et al. 2018

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Stress Determination for Granular Materials Using TSA: An Inverse Approach

Yousefi

Balandraud

Samad

2020

Conference Proceedings of the Society for Experimental Mechanics Series

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Analysis of the Thermomechanical Response of a Rubber-like Granular Material

Jongchansitto

Preechawuttipong

et al. 2022

Thermomechanics &Amp; Infrared Imaging, Inverse Problem Methodologies, Mechanics of Additive &Amp; Advanced Manufactured Materi

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Infrared thermography was used to study the thermal signature of a rubber-like granular material subjected to cyclic confined compression. The discrete medium consisted of cylinders placed in parallel. A fluctuation of the temperature at the same frequency as the mechanical loading was observed, as well as a global self-heating as the cycles progressed. This can be associated with the thermoelastic coupling effect and the mechanical dissipation effect, respectively. The thermoelastic coupling effect is visible in all contact zones between the particles, which can be explained by the stress concentrations that occur there. A strong mechanical dissipation effect occurs at specific contacts, which can be explained by the high friction between certain particles.

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Stress Network Analysis of 2D Non-Cohesive Polydisperse Granular Materials using Infrared Thermography

Cited by 9 publications

References 35 publications

Thermoelastic Couplings and Interparticle Friction Evidenced by Infrared Thermography in Granular Materials

Thermoelastic Couplings and Interparticle Friction Evidenced by Infrared Thermography in Granular Materials

Stress Determination for Granular Materials Using TSA: An Inverse Approach

Analysis of the Thermomechanical Response of a Rubber-like Granular Material

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