scholarly journals Thermomechanical surface instability at the origin of surface fissure patterns on heated circular MDF samples

2019 ◽  
Vol 43 (6) ◽  
pp. 707-716 ◽  
Author(s):  
Andrea Ferrantelli ◽  
Djebar Baroudi ◽  
Sergei Khakalo ◽  
Kai Yuan Li
Keyword(s):  
Surface Instability ◽  
Thermomechanical Surface

Effects of Interfacial Tension in Tunneling Microscopy. 2. Experimental Observation of Surface Instability

1996 ◽  
Vol 100 (46) ◽  
pp. 18229-18233 ◽  
Author(s):  
John F. T. Conroy ◽  
Vlado Hlady ◽  
Cynthia J. Bruckner-Lea ◽  
Jiří Janata
Keyword(s):  
Interfacial Tension ◽  
Experimental Observation ◽  
Surface Instability ◽  
Tunneling Microscopy

Stratigraphy and palaeoenvironmental interpretation of late Quaternary colluvial slope deposits in southern Africa

2021 ◽  
Author(s):  
J. Knight
Keyword(s):  
Southern Africa ◽  
Land Surface ◽  
Late Quaternary ◽  
Ecological Factors ◽  
Surface Instability ◽  
Sediment Supply ◽  
Spatial And Temporal Patterns ◽  
Catchment Scale ◽  
Accommodation Space ◽  
Slope Sediment

Abstract Slope and lowland sediment systems throughout southern Africa are dominated by the presence of colluvium with interbedded palaeosols and hardground duricrusts. These sediments correspond to phases of land surface instability and stability, respectively, during the late Quaternary. This study examines the stratigraphy and environmental interpretation of slope sediment records from specific sites in southern Africa for the period of marine isotope stages (MIS) 6 to 1 (~191 ka to present), informed by theoretical ideas of the dynamics of slope systems including sediment supply and accommodation space. Based on this analysis, phases of land surface instability and stability for the period MIS 6 to 1 are identified. The spatial and temporal patterns of land surface conditions are not a simple reflection of climate forcing, but rather reflect the workings of slope systems in response to climate in addition to the role of geologic, edaphic and ecological factors that operate within catchment-scale sediment systems. Considering these systems dynamics can yield a better understanding of the usefulness and limitations of slope sediment stratigraphies.

Three-Dimensional Finite Element Analysis of Elastic-Plastic Layered Media Under Thermomechanical Surface Loading

2002 ◽  
Vol 125 (1) ◽  
pp. 52-59 ◽  
Author(s):  
N. Ye ◽  
K. Komvopoulos
Keyword(s):  
Finite Element ◽  
Layered Medium ◽  
Numerical Solutions ◽  
Equivalent Stress ◽  
Three Dimensional ◽  
Layered Media ◽  
Thin Layers ◽  
Surface Loading ◽  
Elastic Plastic ◽  
Thermomechanical Surface

The simultaneous effects of mechanical and thermal surface loadings on the deformation of layered media were analyzed with the finite element method. A three-dimensional model of an elastic sphere sliding over an elastic-plastic layered medium was developed and validated by comparing finite element results with analytical and numerical solutions for the stresses and temperature distribution at the surface of an elastic homogeneous half-space. The evolution of deformation in the layered medium due to thermomechanical surface loading is interpreted in light of the dependence of temperature, von Mises equivalent stress, first principal stress, and equivalent plastic strain on the layer thickness, Peclet number, and sliding distance. The propensity for plastic flow and microcracking in the layered medium is discussed in terms of the thickness and thermal properties of the layer, sliding speed, medium compliance, and normal load. It is shown that frictional shear traction and thermal loading promote stress intensification and plasticity, especially in the case of relatively thin layers exhibiting low thermal conductivity.

Surface instability of imperfectly bonded multi-layered curved films under van der Waals forces

2017 ◽  
Vol 82 (5) ◽  
pp. 1088-1103
Author(s):  
Xu Wang ◽  
Peter Schiavone
Keyword(s):  
Cylindrical Shell ◽  
Stability Analysis ◽  
Analytical Solutions ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Imperfect Interface ◽  
Surface Instability ◽  
Simply Supported ◽  
Linear Spring ◽  
Interface Parameters

Abstract Using a linear stability analysis and the transfer matrix method, we investigate the surface instability of an imperfectly bonded multi-layered curved film interacting with a curved rigid contactor, another imperfectly bonded multi-layered curved film or an imperfectly bonded multi-layered simply-supported cylindrical shell in each case through the action of attractive van der Waals forces. The imperfect interface is modelled as a linear spring layer with vanishing thickness characterized by normal and tangential imperfect interface parameters. Detailed numerical results are presented to demonstrate the resulting analytical solutions.

scholarly journals Fermi-surface instability at the ‘hidden-order’ transition of URu2Si2

2009 ◽  
Vol 5 (9) ◽  
pp. 637-641 ◽  
Author(s):  
Andrés F. Santander-Syro ◽  
Markus Klein ◽  
Florin L. Boariu ◽  
Andreas Nuber ◽  
Pascal Lejay ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Surface Instability ◽  
Order Transition ◽  
Hidden Order

scholarly journals Coupled instabilities of surface crease and bulk bending during fast free swelling of hydrogels

Soft Matter ◽  
2016 ◽  
Vol 12 (23) ◽  
pp. 5081-5088 ◽  
Author(s):  
Riku Takahashi ◽  
Yumihiko Ikura ◽  
Daniel R. King ◽  
Takayuki Nonoyama ◽  
Tasuku Nakajima ◽  
...  
Keyword(s):  
Surface Instability ◽  
Mechanical Coupling ◽  
Free Swelling

This work investigates the mechanical coupling of surface instability and bulk bending.

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