Thermal dissipation as both the strength and weakness of matter. A material failure prediction by monitoring creep

Vincent-Dospital, Tom; Toussaint, Renaud; Cochard, Alain; Flekkøy, Eirik Grude; Måløy, Knut Jørgen

doi:10.1039/d0sm02089c

Cited by 5 publications

(6 citation statements)

References 46 publications

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“…The here measured thermal anomalies are however bigger than those that we recently theorised, when the discussed pain pathway was first proposed (Vincent-Dospital and Toussaint, 2021). In this former theoretical study, it was suggested that these anomalies should be on the edge of the TRPs sensitivity and thus relevant to hyperalgesia only rather than to direct algesia as well.…”

Section: On the Magnitude Of The Heat Dissipation And Various Damage Typescontrasting

confidence: 56%

“…The pixel size of our infrared measurement (∼85 µm) was about half an order of magnitude bigger than the typical distance between two neurites (∼20 µm-e.g., Oaklander, 2001;Vincent-Dospital and Toussaint, 2021). It was also almost two orders of magnitude bigger than the length scale l, where the heat is dissipated [here inverted to be in the micrometer range, which is similar to the size of the skin fibers, with two different methods, i.e., with Equations (3) or ( 8)].…”

Section: On Possible Higher Temperatures At the Smallest Scalesmentioning

confidence: 99%

“…Recently, we have also suggested a theory (Vincent-Dospital and Toussaint, 2021) that the damage-induced heat in biological tissues could be responsible for a degree of mechanical pain in the human body. Indeed, should the heat dissipation be large enough, it may be detected by the thermo-sensitive nociceptors of sensory neurons, and, in particular, by some of the so-called TRP proteins.…”

Section: Introductionmentioning

confidence: 99%

“…As we are here interested in the detection of hot anomalies around running fractures, let us now focus on the TRPs that have been reported to be heat sensitive in skin. In our previous theoretical work (Vincent-Dospital and Toussaint, 2021), the role of TRPV3 and TRPV1 was considered. The former (TRPV3) is sensitive to temperatures in the normal biological range (i.e., 30-40 • C), making it, likely, responsible in part for the feeling of warmth (Xu et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Heat Emitting Damage in Skin: A Thermal Pathway for Mechanical Algesia

2021

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Mechanical pain (or mechanical algesia) can both be a vital mechanism warning us for dangers or an undesired medical symptom important to mitigate. Thus, a comprehensive understanding of the different mechanisms responsible for this type of pain is paramount. In this work, we study the tearing of porcine skin in front of an infrared camera, and show that mechanical injuries in biological tissues can generate enough heat to stimulate the neural network. In particular, we report local temperature elevations of up to 24°C around fast cutaneous ruptures, which shall exceed the threshold of the neural nociceptors usually involved in thermal pain. Slower fractures exhibit lower temperature elevations, and we characterise such dependency to the damaging rate. Overall, we bring experimental evidence of a novel—thermal—pathway for direct mechanical algesia. In addition, the implications of this pathway are discussed for mechanical hyperalgesia, in which a role of the cutaneous thermal sensors has priorly been suspected. We also show that thermal dissipation shall actually account for a significant portion of the total skin's fracture energy, making temperature monitoring an efficient way to detect biological damages.

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Section: On the Magnitude Of The Heat Dissipation And Various Damage Typescontrasting

confidence: 56%

Section: On Possible Higher Temperatures At the Smallest Scalesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heat Emitting Damage in Skin: A Thermal Pathway for Mechanical Algesia

2021

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“…Another remark is that Vincent-Dospital et al [8,47] proposed the energy release rate of a material to be related to the core length scale l at which most of the energy is dissipated:…”

Section: Energy Release Ratementioning

confidence: 99%

Heat emitting damage in skin: a thermal pathway for mechanical algesia

Vincent-Dospital,

Toussaint,

Måløy

2021

Preprint

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Mechanical pain (or mechanical algesia) can both be a vital mechanism warning us for dangers or an undesired medical symptom important to mitigate. Thus, a comprehensive understanding of the different mechanisms of this type of pain is paramount. In this work, we study the tearing of porcine skin in front of an infrared camera, and show that mechanical injuries in biological tissues can generate enough heat to stimulate the neural network. In particular, we report local temperature elevations of up to 24 degrees Celsius around fast cutaneous ruptures, which shall exceed the threshold of the neural nociceptors usually involved in thermal pain. Slower fractures exhibit lower temperature elevations, and we characterise such dependency to the damaging rate. Overall, we bring experimental evidence of a novel -thermal -pathway for direct mechanical algesia. In addition, the implications of this pathway are discussed for mechanical hyperalgesia as well, in which a role of the cutaneous thermal sensors has long been suspected. We also show that thermal dissipation shall actually account for a significant portion of the total skin's fracture energy, making temperature monitoring an efficient way to detect biological damages.

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Thermally activated intermittent dynamics of creeping crack fronts along disordered interfaces

Vincent-Dospital

Cochard

Santucci

et al. 2021

Sci Rep

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We present a subcritical fracture growth model, coupled with the elastic redistribution of the acting mechanical stress along rugous rupture fronts. We show the ability of this model to quantitatively reproduce the intermittent dynamics of cracks propagating along weak disordered interfaces. To this end, we assume that the fracture energy of such interfaces (in the sense of a critical energy release rate) follows a spatially correlated normal distribution. We compare various statistical features from the obtained fracture dynamics to that from cracks propagating in sintered polymethylmethacrylate (PMMA) interfaces. In previous works, it has been demonstrated that such an approach could reproduce the mean advance of fractures and their local front velocity distribution. Here, we go further by showing that the proposed model also quantitatively accounts for the complex self-affine scaling morphology of crack fronts and their temporal evolution, for the spatial and temporal correlations of the local velocity fields and for the avalanches size distribution of the intermittent growth dynamics. We thus provide new evidence that an Arrhenius-like subcritical growth is particularly suitable for the description of creeping cracks.

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Thermal dissipation as both the strength and weakness of matter. A material failure prediction by monitoring creep

Abstract: We discuss the ability of a thermally activated sub-critical model, which includes the auto-induced thermal evolution of cracks tips and relies on the monitoring of slow creep, to predict the catastrophic failure threshold of a vast range of materials.

Cited by 5 publications

References 46 publications

Heat Emitting Damage in Skin: A Thermal Pathway for Mechanical Algesia

Heat Emitting Damage in Skin: A Thermal Pathway for Mechanical Algesia

Heat emitting damage in skin: a thermal pathway for mechanical algesia

Thermally activated intermittent dynamics of creeping crack fronts along disordered interfaces

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