Strain‐induced crystallization in rubber: A new measurement technique

Cam, Jean‐Benoît Le

doi:10.1111/str.12256

Cited by 17 publications

(25 citation statements)

References 30 publications

(54 reference statements)

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“…Crystallinity can be evaluated from the part of the total heat source that is produced by SIC only, which gives access to the corresponding crystallization temperature T cryst . The crystallinity χ can then be deduced from T cryst by considering that the crystallization energy of natural rubber can be approximated by the enthalpy of fusion ∆H cryst (in J/dm 3 ) 20,23 :…”

Section: Quantitative Surface Calorimetry From Ir Thermography (Irt-qsc)mentioning

confidence: 99%

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Comparison between x-ray diffraction and quantitative surface calorimetry based on infrared thermography to evaluate strain-induced crystallinity in natural rubber

Cam

Albouy

Charlès

2020

Review of Scientific Instruments

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The crystallinity of stretched crystallizable rubbers is classically evaluated using x-ray diffraction (XRD). As crystallization is a strongly exothermal phenomenon, quantitative surface calorimetry from infrared thermography offers an interesting alternative to XRD for determining the crystallinity. In this paper, the two measurement techniques have been used for evaluating the strain-induced crystallinity of the same unfilled natural rubber. This study provides the first comparison between the two techniques. The results obtained highlight the very satisfactory agreement between the two measurements, which opens a simple way for evaluating the strain-induced crystallinity from temperature measurements.

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Section: Quantitative Surface Calorimetry From Ir Thermography (Irt-qsc)mentioning

confidence: 99%

“…Recently, Ref. 20 has proposed to couple the work by Göritz and co-workers and the IR thermography-based surface calorimetry approach to evaluate the strain-induced crystallinity 20 . By this way, the author measured the crystallinity induced in an unfilled natural rubber submitted to a mechanical tensile cycle.…”

Section: Introductionmentioning

confidence: 99%

Comparison between x-ray diffraction and quantitative surface calorimetry based on infrared thermography to evaluate strain-induced crystallinity in natural rubber

Cam

Albouy

Charlès

2020

Review of Scientific Instruments

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“…Based on the scattered light intensity, Mitchell [52] defined a crystallinity index in 1984 [9,59]. Recently, the measurement of SIC via infrared thermography has been presented by Le Cam [36], which is compared in [37] to the X-ray diffraction technique.…”

Section: Introduction and State Of The Artmentioning

confidence: 99%

Strain-induced crystallisation in natural rubber: a thermodynamically consistent model of the material behaviour using a serial connection of phases

Loos

Aydogdu

Lion

et al. 2020

Continuum Mech. Thermodyn.

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A thermodynamically consistent concept to model the strain-induced crystallisation phenomenon using a multiphase approach is discussed in Loos et al. (CMAT 32(2):501–526,2020). In this follow-up contribution, the same mechanical framework is used to construct a second model that sets the same three phases in a serial connection, demonstrating an alternative to the former parallel connection of phases. The hybrid free energy is used to derive the constitutive equations. The evaluation of the Clausius–Duhem inequality ensures thermomechanical consistency. The model is based on a one-dimensional derivation that extends with the concept of representative directions to a three-dimensional anisotropic model. After the step-by-step derivation, the performance of the model is analysed in detail, including its comparison to the well-known Flory model, its evaluation for infinite fast and slow excitations, its simulation of uniaxial cycles and its validation via relaxation experiments. Finally, the model is compared comprehensively to the former parallel model showing their equivalent reason for existence.

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“…The reader is referred to Delpueyo et al for a list of references in which the 0D approach is employed. This list can be updated with Wang et al dedicated to pure copper, Le Cam dedicated to rubber, and Corvec et al dedicated to different types of leathers. The present study analyses the error generated by the 0D approach in the assessment of mechanical dissipation due to fatigue loading.…”

Section: Introductionmentioning

confidence: 99%

Comparison between 0D and 1D approaches for mechanical dissipation measurement during fatigue tests

Jongchansitto

Douellou

Preechawuttipong

et al. 2019

Strain

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Fatigue in materials is generally associated with the production of heat, leading to the “self‐heating” of the tested material. The associated heat power density, named mechanical dissipation or intrinsic dissipation, can be deduced from the temperature changes captured on the tested specimen's surface by infrared thermography. When mechanical dissipation is spatially homogeneous in the tested specimen, the processing can be performed using a macroscopic approach, also named zero‐dimensional (0D) approach. The latter uses an averaged temperature over the whole specimen's measurement zone. The present study aims to analyse the error generated by the 0D approach in the assessment of mechanical dissipation. This error was measured with respect to a one‐dimensional (1D) approach, which is applicable for longitudinal specimens subjected to uniaxial loading. Experimental tests were performed on pure copper and acrylic glass. A model was also developed to analyse the influence of the material and of the heat exchanges with the specimen's environment. The results obtained show that the error generated by the 0D approach in mechanical dissipation measurement may not be negligible and that attention should be paid to the choice of approach for fatigue analysis.

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Strain‐induced crystallization in rubber: A new measurement technique

Cited by 17 publications

References 30 publications

Comparison between x-ray diffraction and quantitative surface calorimetry based on infrared thermography to evaluate strain-induced crystallinity in natural rubber

Comparison between x-ray diffraction and quantitative surface calorimetry based on infrared thermography to evaluate strain-induced crystallinity in natural rubber

Strain-induced crystallisation in natural rubber: a thermodynamically consistent model of the material behaviour using a serial connection of phases

Comparison between 0D and 1D approaches for mechanical dissipation measurement during fatigue tests

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