Micromechanical interpretation of thermo-plastic behaviour of clays

The effect of temperature on mechanical behaviour of clay-based geomaterials is relevant in a number of geotechnical applications (e.g. low enthalpy geothermal systems and energy geostructures, nuclear waste disposal, and heating in rapid shear deformation). Mechanical response of (saturated) clays upon heating is not always intuitive as volume changes may occur due to both thermal expansion of clay constituents and temperature-induced changes of clay microstructure. This paper first revisits the macroscopic thermally-induced mechanical behaviour of saturated clays available in the literature via an advanced thermo-elastoplastic constitutive model and then elucidates the dependence on clay mineralogy of the two key parameters of the model (mechanical hardening and thermal softening respectively) by inspecting differences in clay inter-particle electro-chemical forces occurring in kaolinitic, illitic, and smectitic clays. The micromechanically-based interpretation of constitutive parameters can serve as a guidance for soil parameter selection in the design of energy geostructures.

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A Review on Effect of Temperature Change on Mechanical Parameters of Fine Soils

Periodica Polytechnica Civil Engineering ◽

10.3311/ppci.16533 ◽

2021 ◽

Author(s):

Hamed Hoseinimighani ◽

Janos Szendefy

Keyword(s):

Temperature Change ◽

Thermal Effects ◽

Structural Rearrangement ◽

Solid Particles ◽

Effect Of Temperature ◽

Mechanical Parameters ◽

Thermally Induced ◽

Geotechnical Design ◽

Induced Changes ◽

Consolidation Parameters

Temperature change in soils and its possible effects date back to 20th century where temperature difference between laboratory and field for sampling made researchers interested in this topic. Due to development of technology and industry nowadays, new engineering applications such as nuclear waste disposal, oil extraction and pipelines, geothermal structures etc. have turned temperature change in soils to one of the high trending research topics where suitable knowledge of thermal effects on soils is required. For this purpose, it is tried at first to highlight the importance of temperature effect on geotechnical design by some examples and possible effect of temperature change on mechanical properties of fine soils are reviewed afterward. Investigation on results from literature proved that temperature change could alter some strength and consolidation parameters of fine soils. Different factors are proposed to be responsible for such thermally induced changes in mechanical parameters, however, existing explanations and comments from literature are diverse and not fully understood yet. In order to fill this gap, it is tried to find connections between different mechanical parameters and their behavior toward temperature change and possibly find a unified approach and factor to explain the mechanism responsible for thermally induced changes in mechanical parameters of fine soils. Finally, at the end, it is concluded that effect of temperature on structural rearrangement of solid particles could be a promising factor to connect the responses of different mechanical parameters toward temperature change.

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Unraveling the mechanical behaviour of hydrazine borane (NH2–NH2–BH3)

Physical Chemistry Chemical Physics ◽

10.1039/c7cp08291f ◽

2018 ◽

Vol 20 (4) ◽

pp. 2845-2850 ◽

Cited By ~ 2

Author(s):

Pascal G. Yot ◽

Vibhav Yadav ◽

Salem Ould Amara ◽

Jean-Paul Itiè ◽

Umit B. Demirci ◽

...

Keyword(s):

Crystal Structure ◽

Mechanical Behaviour ◽

Mechanical Response ◽

Mechanical Stimulus ◽

Structural Behaviour ◽

Bond Lengths ◽

Molecular Bond ◽

Induced Changes

The structural behaviour of hydrazine borane was explored under mechanical stimulus. The compressibility of this solid was established to be relatively low and highly anisotropic. The mechanical response was correlated to the pressure-induced changes of its crystal structure in terms of intra- and inter-molecular bond lengths and angles parameters.

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Thermally induced changes in cluster-assembled carbon nanocluster films observed via photoelectron spectroscopy

Applied Surface Science ◽

10.1016/s0169-4332(03)00020-5 ◽

2003 ◽

Vol 212-213 ◽

pp. 879-884 ◽

Cited By ~ 1

Author(s):

E. Magnano ◽

C. Cepek ◽

M. Sancrotti ◽

F. Siviero ◽

S. Vinati ◽

...

Keyword(s):

Photoelectron Spectroscopy ◽

Thermally Induced ◽

Induced Changes

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Formation process of interface states at grain boundaries in sputtered polycrystalline Si films

Journal of Materials Research ◽

10.1557/jmr.1999.0054 ◽

1999 ◽

Vol 14 (2) ◽

pp. 371-376 ◽

Cited By ~ 5

Author(s):

Yoshitaka Nakano ◽

Jiro Sakata ◽

Yasunori Taga

Keyword(s):

Energy Levels ◽

Columnar Structure ◽

Systematic Investigation ◽

Defect States ◽

Electron Microscopic ◽

Thermally Induced ◽

Transmission Electron ◽

Transmission Electron Microscopic ◽

Si Films ◽

Induced Changes

A systematic investigation has been made on surface defect states of crystallites in the crystallization process of sputtered amorphous silicon films by isothermal annealing. Transmission electron microscopic observations indicate a pronounced vertical columnar structure in the upper part of the films, where the crystallization is delayed. Admittance spectroscopy reveals that two newly generated energy levels with the crystallization are attributed to the crystallites in the lower and upper parts of the films in view of the anisotropic crystallization. These thermally induced changes can be well explained by Si–Si shearing modes at the interfaces of crystallites through the process of crystallization.

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Thermally induced changes in lipid composition of raft and non-raft regions of hepatocyte plasma membranes of rainbow trout

Journal of Experimental Biology ◽

10.1242/jeb.01899 ◽

2005 ◽

Vol 208 (22) ◽

pp. 4283-4290 ◽

Cited By ~ 24

Author(s):

J. K. Zehmer

Keyword(s):

Rainbow Trout ◽

Lipid Composition ◽

Plasma Membranes ◽

Thermally Induced ◽

Induced Changes

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Virtual trabecular bone models and their mechanical response

Proceedings of the Institution of Mechanical Engineers Part H Journal of Engineering in Medicine ◽

10.1243/09544119jeim408 ◽

2008 ◽

Vol 222 (8) ◽

pp. 1185-1195 ◽

Cited By ~ 5

Author(s):

F E Donaldson ◽

P Pankaj ◽

A H Law ◽

A H Simpson

Keyword(s):

Finite Element ◽

Trabecular Bone ◽

Mechanical Behaviour ◽

Mechanical Response ◽

Elastic Response ◽

Anatomical Site ◽

Virtual Samples ◽

Micro Level ◽

Architectural Characteristics

The study of the mechanical behaviour of trabecular bone has extensively employed micro-level finite element (μFE) models generated from images of real bone samples. It is now recognized that the key determinants of the mechanical behaviour of bone are related to its micro-architecture. The key indices of micro-architecture, in turn, depend on factors such as age, anatomical site, sex, and degree of osteoporosis. In practice, it is difficult to acquire sufficient samples that encompass these variations. In this preliminary study, a method of generating virtual finite element (FE) samples of trabecular bone is considered. Virtual samples, calibrated to satisfy some of the key micro-architectural characteristics, are generated computationally. The apparent level elastic and post-elastic mechanical behaviour of the generated samples is examined: the elastic mechanical response of these samples is found to compare well with natural trabecular bone studies conducted by previous investigators; the post-elastic response of virtual samples shows that material non-linearities have a much greater effect in comparison with geometrical non-linearity for the bone densities considered. Similar behaviour has been reported by previous studies conducted on real trabecular bone. It is concluded that virtual modelling presents a potentially valuable tool in the study of the mechanical behaviour of trabecular bone and the role of its micro-architecture.

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Thermally induced changes in magnetic, transport and electronic properties of Fe/Al multilayers

Solid State Communications ◽

10.1016/j.ssc.2005.02.013 ◽

2005 ◽

Vol 134 (7) ◽

pp. 479-484 ◽

Cited By ~ 11

Author(s):

R. Brajpuriya ◽

S. Tripathi ◽

S.M. Chaudhari

Keyword(s):

Electronic Properties ◽

Thermally Induced ◽

Magnetic Transport ◽

Induced Changes

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Effect of temperature on the mechanical response of thermo-viscoelastic asphalt pavements

Construction and Building Materials ◽

10.1016/j.conbuildmat.2011.11.048 ◽

2012 ◽

Vol 30 ◽

pp. 574-582 ◽

Cited By ~ 19

Author(s):

Flavio V. Souza ◽

Leandro S. Castro

Keyword(s):

Mechanical Response ◽

Asphalt Pavements ◽

Effect Of Temperature

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Temperature-dependent nanomechanics and topography of bacteriophage T7

10.1101/326520 ◽

2018 ◽

Author(s):

Zsuzsanna Vörös ◽

Gabriella Csík ◽

Levente Herényi ◽

Miklós Kellermayer

Keyword(s):

Structural Changes ◽

Mechanical Stability ◽

Genetic Material ◽

Heat Inactivation ◽

Infectious Agents ◽

Temperature Dependent ◽

Thermally Induced ◽

Partial Denaturation ◽

Induced Changes ◽

T7 Bacteriophage

AbstractViruses are nanoscale infectious agents which may be inactivated by heat treatment. Although heat inactivation is thought to be caused by the release of genetic material from the capsid, the thermally-induced structural changes in viruses are little known. Here we measured the heat-induced changes in the properties of T7 bacteriophage particles exposed to two-stage (65 °C and 80 °C) thermal effect by using AFM-based nanomechanical and topographical measurements. We found that exposure to 65 °C caused the release of genomic DNA due to the loss of the capsid tail which leads to a destabilization of the T7 particles. Further heating to 80 °C surprisingly led to an increase in mechanical stability due to partial denaturation of the capsomeric proteins kept within the global capsid arrangement.

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