Viscoplastic Hoffman consistency model for concrete

Winnicki, A.; Pearce, CJ; Bícanić, Nenad

doi:10.1016/s0045-7949(00)00110-3

Cited by 67 publications

(36 citation statements)

References 4 publications

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“…In FEM-based models the cracks are usually represented as inelastic localized deformation zones, see refs. [36,38]. Zhu et al [45] used a FEM-based numerical code of rock failure process analysis (RFPA) to simulate the behavior of Brazilian disc samples of rocks under combined static and dynamic loading conditions.…”

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confidence: 99%

A numerical and experimental study on the tensile behavior of plasma shocked granite under dynamic loading

Mardoukhi

Saksala²,

Hokka³

et al. 2017

RakMek

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Summary. This paper presents a numerical and experimental study on the mechanical behavior of plasma shocked rock. The dynamic tensile behavior of plasma shock treated Balmoral Red granite was studied under dynamic loading using the Brazilian disc test and the Split Hopkinson Pressure Bar device. Different heat shocks were produced on the Brazilian disc samples by moving the plasma gun over the sample at different speeds. Microscopy clearly showed that as the duration of the thermal shock increases, the number of the surface cracks and their complexity increases (quantified here as the fractal dimension of the crack patterns) and the area of the damaged surface grows larger as well. At the highest thermal shock duration of 0.80 seconds the tensile strength of the Brazilian disc sample drops by approximately 20%. In the numerical simulations of the dynamic Brazilian disc test, this decrease in tensile strength was reproduced by modeling the plasma shock induced damage using the embedded discontinuity finite element method. The damage caused by the plasma shock was modeled by two methods, namely by pre-embedded discontinuity populations with zero strength and by assuming that the rock strength is lowered and conform to the Weibull distribution. This paper presents a quantitative assessment of the effects of the heat shock, the surface microstructure and mechanical behavior of the studied rock, and a promising numerical model to account for the pre-existing crack distributions in a rock material.

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A numerical and experimental study on the tensile behavior of plasma shocked granite under dynamic loading

Mardoukhi

Saksala²,

Hokka³

et al. 2017

RakMek

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“…return mapping, algorithms for classical plasticity and viscoplasticity are considered, e.g. in [1,4], while algorithms for consistent viscoplasticity are developed in [2,4,5]. For present purposes, the stress integration algorithm by Wang et al [2] is utilized.…”

Section: Return Mapping Scheme For Viscoplastic Consistency Modelmentioning

confidence: 99%

Two-step Exact Solution for Mohr-Coulomb Viscoplastic Consistency Model with Linear Hardening/Softening: A Proof with Maple Software

Saksala

2012

AJCAM

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It has been observed numerically that the viscoplastic consistency model by Wang (1997) with a linear yield surface and a linear hardening/softening rule converges, using the standard stress return mapping, with two steps. In this paper this numerical observation is proved analytically using the Maple software. The proof is carried out for the Mohr-Coulomb viscoplastic consistency model. However, a similar proof can be performed for other linear models, such as the Rankine and Tresca models, as well.

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“…A parabolic criterion, which was recently used by several authors (Winnicki et al, 2001) for concrete modelling, meets the requirement of a semi-opened yield surface. Generally, such a criterion includes two hardening parameters f c and f t in order to represent the evolution of the limit curve along the tensile directions (f t ) and the compressive directions (f c ).…”

Section: The Yield Criterionmentioning

confidence: 99%

Mechanical characterisation of a viscoplastic material sensitive to hydrostatic pressure

Gratton¹,

Gontier²,

Allah³

et al. 2009

European Journal of Mechanics - A/Solids

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International audienceThe present paper deals with the characterisation of the static mechanical behaviour of an energetic material all along its lifespan. The material behaviour is viscoplastic, damageable and sensitive to hydrostatic pressure. For such materials, existing models have generally been developed in the framework of transient dynamic behaviour. These models are not suitable for a static study. Therefore a specific experimental protocol and an associated model are developed. Characterisation is derived from both uniaxial compressive, tensile tests and tri-axial tests. Plastic behaviour is described by means of a parabolic yield criterion and a new hardening law. Non-associated plastic flow rule and isotropic damage complete the model. The performance of the model is illustrated through the simulation of various loading paths

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Viscoplastic Hoffman consistency model for concrete

Cited by 67 publications

References 4 publications

A numerical and experimental study on the tensile behavior of plasma shocked granite under dynamic loading

A numerical and experimental study on the tensile behavior of plasma shocked granite under dynamic loading

Two-step Exact Solution for Mohr-Coulomb Viscoplastic Consistency Model with Linear Hardening/Softening: A Proof with Maple Software

Mechanical characterisation of a viscoplastic material sensitive to hydrostatic pressure

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