FEM simulation of viscous properties for granular materials considering the loading rate effect

Peng, Fang-Le; Li, Fulin; Tan, Yi; Kongkitkul, Warat

doi:10.1007/s10035-010-0194-7

Cited by 10 publications

(5 citation statements)

References 33 publications

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“…The ó d max is a function of axial strain rate (Enomoto et al, 2009;Peng et al, 2010), which must be held constant for a series of tests to be comparable. Historically, ó d max is the ultimate unconfined compressive strength.…”

Section: Creep Stresses and Stress Levelsmentioning

confidence: 99%

Experimental creep behaviour and modelling of silicified sand

Becker¹,

Dove²,

Dove³

2013

Proceedings of the Institution of Civil Engineers - Ground Impr

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The stress-strain-time behaviour was investigated for sand that was treated by a new biologically inspired silicification process. This ground treatment method offers the potential to achieve similar performance as existing soil treatment methods using lower concentrations of environmentally benign component materials. This experimental study evaluated the influence of a polyelectrolyte pretreatment and test procedure on the fundamental strength of medium dense Ottawa 20/30 sand silicified with 20% sodium silicate. Samples were subjected to unconfined single-increment, unconfined incremental, and confined incremental creep tests. The results show that the creep behaviour of silicified samples is similar to the behaviour of traditionally treated sand. Fundamental strengths were approximately 50 kPa when unconfined, and ranged from 117 kPa to greater than 340 kPa when confined at 69 and 138 kPa, respectively. The data also show that incremental creep tests may be a more rapid means of determining parameters for creep modelling than the existing standardised single-increment test method.Parameters for modelling long-term deformation behaviour are consistent with published parameters for existing soil treatment methods even though compositional differences exist between the samples used in studies.

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Section: Creep Stresses and Stress Levelsmentioning

confidence: 99%

Experimental creep behaviour and modelling of silicified sand

Becker¹,

Dove²,

Dove³

2013

Proceedings of the Institution of Civil Engineers - Ground Impr

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“…where ψ is the mobilized angle of dilatancy, which is defined as: (4) where and are volumetric strain increments and plastic shear strain increment. The value of ψ could be determined by a simply empirical equation.…”

Section: Constitutive Modelmentioning

confidence: 99%

“…Based on Dynamic Relaxation technique (Siddiquee et al [3]), this model was implemented into "Geotechnical Nonlinear Analysis (GNA)". Peng et al [4] used GNA to simulate not only entire stress-strain relation as described above for dense Toyoura sand but also the strain localization phenomenon at immediate point before the peak state, immediately after the peak state and at the start of the residual state, respectively. The simulation results were compared with plane strain compression (PSC) testing results on air-dried dense Toyoura sand conducted by Kongkitkul [5].…”

Section: Introductionmentioning

confidence: 99%

Numerical Implementation of Energy-based Models in Explicit Finite Element Analysis for Sand in Plane Strain Compression

Chattonjai

2015

KMUTNB: IJAST

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Soil is one of the most complex materials. In finite element analysis, the relevant constitutive model is one of the main key that provides the accurate prediction of strength and deformation characteristic of geotechnical structure. The objective of this study is to implement the elasto-plastic work-hardening-softening constitutive model (Energy-based model) into ABAQUS via VUMAT subroutine. Without updating Jacobian matrix process, the VUMAT subroutine is rather more convenient to implement than UMAT subroutine. Therefore, the high efficiency of strategy to update the new stress and plastic strain energy is crucially important. The VUMAT simulated results on the effect of initial stress and softening behavior were verified by UMAT and the experimental results of Toyoura dense sand under plane strain condition. The VUMAT subroutine could accurately simulate the strength and deformation characteristics of Toyoura sand. However, its results shows the irregularities at transition point.Please cite this article as: P. Chattonjai, "Numerical implementation of energy-based models in explicit finite element analysis for sand in plane strain compression," KMUTNB Int

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“…Regarding strain rate effects, granular soils exhibit very abundant and various effects. This was investigated by Tatsuoka et al (2002Tatsuoka et al ( , 2008, Di Benedetto et al (2002), Duttine and Tatsuoka (2009), Enomoto et al (2009) and Peng et al (2010). Different stress responses resulting from a sudden change of the strain rate are classified as 1.…”

Section: Introductionmentioning

confidence: 99%

Time-dependent behaviour of sand with different fine contents under oedometric loading

2019

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To characterize the effects of creep, strain rate, and relaxation in granular soils, different sands have been studied under oedometric loading. The tests were analysed in the framework of the isotache concept. The results show increasing creep rates with increasing vertical stresses and a strong reduction of the creep rate upon unloading. A lower void ratio leads to less creep. Evaluation of the ratio Cα/Cc, where Cα is the creep coefficient and Cc is the compression index, demonstrates considerable deviation from a constant soil-specific value for the sands. With increasing fine content, however, a constant soil-specific ratio has been found for a silty sand. In strain rate–controlled tests, a sand with low and a sand with significant content of nonplastic fines were compared. Constant rate of strain tests displayed practically no strain rate dependency for the sand with little fines and a well visible strain rate dependency for the very silty sand. Tests with stepwise change of strain rate showed non-isotache behaviour for the sand with little fines and isotache behaviour for the other. Stress-relaxation tests displayed an isochronous behaviour. The analysis of the three viscous effects in sands showed they cannot altogether be mathematically described in the framework of the isotache concept. A new compression model for the creep behaviour of sands is presented.

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FEM simulation of viscous properties for granular materials considering the loading rate effect

Cited by 10 publications

References 33 publications

Experimental creep behaviour and modelling of silicified sand

Experimental creep behaviour and modelling of silicified sand

Numerical Implementation of Energy-based Models in Explicit Finite Element Analysis for Sand in Plane Strain Compression

Time-dependent behaviour of sand with different fine contents under oedometric loading

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