scholarly journals Time-Dependent Shear Deformation Characteristics of Sand and their Constitutive Modelling

2002 ◽  
Vol 42 (2) ◽  
pp. 1-22 ◽  
Author(s):  
Hervé Di Benedetto ◽  
Fumio Tatsuoka ◽  
Masanori Ishihara
Keyword(s):  
Shear Deformation ◽  
Constitutive Modelling ◽  
Time Dependent ◽  
Deformation Characteristics

scholarly journals Time-Dependent Shear Deformation Characteristics of Geomaterials and their Simulation

2002 ◽  
Vol 42 (2) ◽  
pp. 103-129 ◽  
Author(s):  
Fumio Tatsuoka ◽  
Masanori Ishihara ◽  
Hervé Di Benedetto ◽  
Reiko Kuwano
Keyword(s):  
Shear Deformation ◽  
Time Dependent ◽  
Deformation Characteristics

scholarly journals Effects of loading rate on strength and deformation characteristics of gypsum mixed sand

2019 ◽  
Vol 92 ◽  
pp. 05008
Author(s):  
Zain Maqsood ◽  
Junichi Koseki ◽  
Hiroyuki Kyokawa
Keyword(s):  
Strain Rate ◽  
Axial Strain ◽  
Constitutive Modelling ◽  
Strain Rates ◽  
Deformation Characteristics ◽  
Wide Range ◽  
Strength And Deformation ◽  
Loading Tests ◽  
Rational Evaluation ◽  
Strain Responses

It has been unanimously acknowledged that the strength and deformation characteristics of bounded geomaterials, viz. cemented soils and natural rocks, are predominantly governed by the rate of loading/deformation. Rational evaluation of these time-dependent characteristics due to viscosity and ageing are vital for the reliable constitutive modelling. In order to study the effects of ageing and loading/strain rate (viscosity) on the behaviour of bounded geomaterials, a number of unconfined monotonic loading tests were performed on Gypsum Mixed Sand (GMS) specimens at a wide range of axial strain rates; ranging from 1.9E-05 to 5.3E+00 %/min (27,000 folds), and at different curing periods. The results indicate shifts in the viscous behaviour of GMS at critical strain rates of 2.0E-03 and 5.0E-01 %/min. In the light of this finding, the results are categorized into three discrete zones of strain rates, and the behaviour of GMS in each of these zones is discussed. A significant dependency of peak strength and stress-strain responses on strain rate was witnessed for specimens subjected to strain rates lesser than 2.0E-03 %/min, and the effects of viscosity/strain rate was found to be insignificant at strain rate higher than 5.0E-01%/min.

Shear deformation characteristics and defect evolution of the biaxial ±45° and 0/90° glass non-crimp fabrics

2020 ◽  
Vol 193 ◽  
pp. 108137 ◽  
Author(s):  
Ming Mei ◽  
Yujia He ◽  
Xujing Yang ◽  
Kai Wei ◽  
Zhaoliang Qu ◽  
...  
Keyword(s):  
Shear Deformation ◽  
Deformation Characteristics ◽  
Defect Evolution

Unified Constitutive Modelling of Nonlinear Time-Dependent Materials

1989 ◽  
Vol 42 (11S) ◽  
pp. S78-S82
Author(s):  
P. G. Glockner ◽  
W. Szyszkowski
Keyword(s):  
Strain Softening ◽  
Strain Tensor ◽  
Damage Function ◽  
Constitutive Modelling ◽  
Constitutive Law ◽  
Time Dependent ◽  
Type Integral ◽  
Characteristic Features ◽  
Stress Dependent ◽  
Semi Empirical

A semi-empirical engineering constitutive law modelling in a unified and continuous manner the main characteristic features of time-dependent materials, including creep, strain softening, relaxation and recovery and tensile brittleness, is briefly reviewed. The model, which contains 13 parameters, is a hereditary single Volterra-type integral representation of material response with stress/strain nonlinearity assumed in the form of a power law, the strain tensor dependent on the entire stress history and the stress-anisotropy/brittleness feature handled by means of a tensile-stress dependent damage function. The capability/versatility of the model is illustrated by examples for several materials.

scholarly journals Consititutive modeling of time-dependent flows in frictional suspensions

2021 ◽  
Vol 249 ◽  
pp. 01002
Author(s):  
Michael Cates
Keyword(s):  
Normal Force ◽  
Shear Thickening ◽  
Constitutive Modelling ◽  
Contact Forces ◽  
Time Dependent ◽  
Joint Work ◽  
Modelling Framework ◽  
New Concepts ◽  
Quantitative Accuracy ◽  
Granular Suspensions

This paper summarizes recent joint work towards a constitutive modelling framework for dense granular suspensions. The aim is to create a time-dependent, tensorial theory that can implement the physics described in steady state by the Wyart-Cates model. This model of shear thickening suspensions supposes that lubrication films break above a characteristic normal force so that frictional contact forces come into play: the resulting non-sliding constraints can be enough to rigidify a system that would flow freely at lower stresses [1]. Implementing this idea for time-dependent flows requires the introduction of new concepts including a configuration-dependent ‘jamming coordinate’, alongside a decomposition of the velocity gradient tensor into compressive and extensional components which then enter the evolution equation for particle contacts in distinct ways. The resulting approach [2, 3] is qualitatively successful in addressing (i) the collapse of stress during flow reversal in shear flow, and (ii) the ability of transverse oscillatory flows to unjam the system. However there is much work required to refine this approach towards quantitative accuracy, by incorporating more of the physics of contact evolution under flow as determined by close interrogation of particle-based simulations.

scholarly journals Triaxial Testing to Determine the Effect of Soil Type and Organic Carbon Content on Soil Consolidation and Shear Deformation Characteristics

2014 ◽  
Vol 78 (4) ◽  
pp. 1192-1200 ◽  
Author(s):  
Debashis Chakraborty ◽  
Christopher W. Watts ◽  
David S. Powlson ◽  
Andrew J. Macdonald ◽  
Rhys W. Ashton ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Carbon Content ◽  
Shear Deformation ◽  
Soil Type ◽  
Triaxial Testing ◽  
Organic Carbon Content ◽  
Deformation Characteristics ◽  
Soil Consolidation
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