Self-heating of plastics during cyclic defformation

Ratner, S. B.; Korobov, V. I.

doi:10.1007/bf00858807

Cited by 32 publications

(34 citation statements)

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“…The isothermal hypothesis may be locally wrong when considering viscoelastic tissues submitted to dynamic loading. Indeed, viscoelastic materials dissipate part of the mechanical energy into heat, creating thus an internal heat source in the materials (Ratner and Korobov, 1966). The corresponding effect may be spectacular, as it has been shown that an increase in temperature of 6.5 1C can be generated between the outer and inner parts of a horse tendon during intense running (Wilson and Goodship, 1994).…”

Section: Introductionmentioning

confidence: 99%

Intrinsic viscoelasticity increases temperature in knee cartilage under physiological loading

Abdel-Sayed

Moghadam

Salomir

et al. 2014

Journal of the Mechanical Behavior of Biomedical Materials

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Temperature Magnetic resonance imagingDifferential scanning calorimetry a b s t r a c t Metabolism of proteoglycans and hyaluronic acid has been shown to be temperaturedependent in cartilage explants, with optimal anabolic effects between 36 1C and 38 1C. At rest, the temperature of human knee has a value of around 33 1C. We aim to show in this study that viscoelastic properties of healthy human cartilage allow its temperature to reach those optimal temperatures during physiological mechanical loadings. We developed a model allowing to determine the temperature increase in cartilage due to viscous dissipation. The model had three parameters, which were determined experimentally. The first parameter was the energy dissipated by cartilage samples submitted to cyclic stimulation. It was obtained with standard in vitro mechanical testing. The second parameter was the cartilage heat capacity and was measured in vitro with differential scanning calorimetry. Finally, the third parameter was the time constant of cartilage heat transfer and was obtained with in vivo magnetic resonance thermometry performed on four volunteers. With these experimentally determined parameters, the model predicted that cartilage dissipation is sufficient to raise the temperature in healthy knee cartilage from 33 1C to 36.7 1C after a 1 h walking. These results showed that intrinsic viscoelastic properties of the cartilage could induce a temperature increase optimal for the production of proteoglycans and hyaluronic acid. Interestingly, degenerated cartilage did not present high enough viscoelastic properties to significantly induce a temperature increase. Taken together, these data suggest an association between cartilage dissipation and its homeostasis.

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Section: Introductionmentioning

confidence: 99%

Intrinsic viscoelasticity increases temperature in knee cartilage under physiological loading

Abdel-Sayed

Moghadam

Salomir

et al. 2014

Journal of the Mechanical Behavior of Biomedical Materials

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“…This work serves as an extension to prior experiments detailing the thermomechanical response of HTPB-NH 4 Cl beams 19 by highlighting the effects associated with changes in the ratio of crystal to binder. The plates themselves serve as mechanical mocks of common plasticbonded energetic materials.…”

Section: Introductionmentioning

confidence: 97%

“…As noted above, this work focuses on the thermomechanics of a mock plastic-bonded explosive material comprised of an HTPB binder and NH 4 Cl particles. HTPB is a commonly employed binder material and the NH 4 Cl particles were chosen in order to approximate the particle sizes of ammonium perchlorate (AP), an energetic material.…”

Section: Experimental Techniques a Sample Preparationmentioning

confidence: 99%

“…HTPB is a commonly employed binder material and the NH 4 Cl particles were chosen in order to approximate the particle sizes of ammonium perchlorate (AP), an energetic material. The volume ratio of particle to binder may vary significantly in real-world explosives, and the effect of such changes on the mechanical and thermal responses of the bulk material is of importance in this paper.…”

Section: Experimental Techniques a Sample Preparationmentioning

confidence: 99%

“…Prior investigations have highlighted, for example, the fact that heating within materials due to cyclic deformation is often attributable to a phase delay between fluctuating stress and strain fields. 4 Likewise, in the context of vibrothermography, Renshaw 5 and others [6][7][8] have shown that high-frequency excitation is highly effective at eliciting thermal responses near stress concentrations, such as cracks, voids, and inclusions. While most of the prior work in thermography specifically targets heating near defects, research in this area has also highlighted stressinduced heating along the modal structure of various systems.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermal and mechanical response of particulate composite plates under inertial excitation

Miller

Woods

Rhoads

2014

Journal of Applied Physics

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The thermal and mechanical, near-resonant responses of particulate composite plates formed from hydroxyl-terminated polybutadiene (HTPB) binder and varying volume ratios of ammonium chloride (NH4Cl) particles (50, 65, 75%) are investigated. Each test specimen is clamped and forced with three levels of band-limited, white noise inertial excitation (10–1000 Hz at 1.00, 1.86 and 2.44 g RMS). The mechanical response of each plate is recorded via scanning laser Doppler vibrometry. The plates are then excited at a single resonant frequency and the thermal response is recorded via infrared thermography. Comparisons are made between the mechanical operational deflection shapes of each plate and spatial temperature distributions, with correlation seen between the observed level of strain, as visualized by strain energy density, and heat generation. The effect of particle/binder ratio on both the thermal and mechanical responses is discussed. Acquired results are also compared to an analytical model of the system. The observed thermomechanical effects render an improved understanding of the thermomechanics of plastic-bonded composites, an essential step in support of the development of new technologies for the vapor-based detection of hidden explosives.

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Hysteretic Heating During Cyclic Loading of Medical Grade Ultra High Molecular Weight Polyethylene (UHMWPE)

Galetz

Goetz

Adam³

et al. 2007

Adv Eng Mater

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Self-heating of plastics during cyclic defformation

Cited by 32 publications

References 0 publications

Intrinsic viscoelasticity increases temperature in knee cartilage under physiological loading

Intrinsic viscoelasticity increases temperature in knee cartilage under physiological loading

Thermal and mechanical response of particulate composite plates under inertial excitation

Hysteretic Heating During Cyclic Loading of Medical Grade Ultra High Molecular Weight Polyethylene (UHMWPE)

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