A Nonlinear Creep Model of Rock Salt and Its Numerical Implement in FLAC<sup>3D</sup>

Liu, Xinrong; Yang, Xin; Wang, Junbao

doi:10.1155/2015/285158

Cited by 15 publications

(11 citation statements)

References 14 publications

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“…In terms of stress-strain curve-fitting figures of the specimens, (see Figures 7,8,9,10,11,12,13,14,15 and 16) the fitting degree in the declining stage was good and the curve shape did not change significantly. Therefore it can be simulated easily with the formula.…”

Section: Verification Of the Damage Constitutive Modelmentioning

confidence: 89%

“…In order to cause a decline in the stress of the curve after the peak value in the software, formula (15) must be changed to the increment type 14 . This can be obtained by derivation as follows While formula (16) is realized in the software, parameter f c,r can be weakened gradually to reduce stress after the peak value.…”

Section: Elasticity Increment Equationmentioning

confidence: 99%

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A damage constitutive model for multi-scale polypropylene fiber concrete under compression and its numerical implementation

Liu

Yang

Liang

2015

Journal of Reinforced Plastics and Composites

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Multi-scale polypropylene fiber concrete has been put into use in the enhancement of structures such as bridges, wharfs, and road surfaces. This paper makes experimental study on the cube compressive strength of polypropylene fiber concrete with different slenderness ratios, and studies its improvement of the cubic compressive strength of concrete through mixed admixture of polypropylene fibers with different degrees of thicknesses. The experimental results show that: the cubic compressive strength of the concrete improved by 6.2-13.7% with single and mixed admixtures of polypropylene fibers. In addition, this paper builds on previous studies to establish a damage constitutive model of multi-scale polypropylene fiber concrete under compression, studies its application in the secondary development of FLAC 3D software, and makes numerical simulation based on the developed model, whose calculation results accorded with the test date very well. KeywordsMulti-scale polypropylene fiber concrete, cubic compressive strength experiment, damage constitutive model, secondary development PrefaceThe earliest study on polypropylene fiber concrete can be traced back to the early 1960s, Goldfein 1 found that an admixture of polypropylene fiber with a volume fraction of 0.5% in concrete can enhance the tenacity and shock resistance of concrete, proposed the use of polypropylene fiber as an admixture in concrete to increase explosion protection structure, for the first engineering application of polypropylene fiber concrete.Ramakrishnan 2-4 and Gopalratnam et al. 5 studied the properties of beam-shaped polypropylene fiber concrete and found that compressive strength of the polypropylene fiber concrete was only improved by a slight degree, with the increasement of fiber contents, cracks were more able to absorb energy in later stages. The tenacity index of the concrete was equal to that of normal concrete when the fiber content reached 0.949 kg/m 3 , when the fiber content increased to two times, the tenacity index was 7.8, when the fiber content increased to three times, the tenacity index was increased to 11.7. The fatigue strength improved by 15-18% compared to that of normal concrete.Song et al. 6 made experimental study on the physical and mechanical properties of the concrete with the admixture of polypropylene fiber and they found that: an admixture of polypropylene fiber improved compressive strength, rupture resistance, splitting tensile

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Section: Verification Of the Damage Constitutive Modelmentioning

confidence: 89%

Section: Elasticity Increment Equationmentioning

confidence: 99%

A damage constitutive model for multi-scale polypropylene fiber concrete under compression and its numerical implementation

Liu

Yang

Liang

2015

Journal of Reinforced Plastics and Composites

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“…Numerical calculation can be performed using the nonlinear finite element program ADINA, operating in the Visual Fortran 6.6A secondary development environment to generate the file of the dynamic link library [14]. e viscoelastic-plastic damage constitutive model of artificial frozen soil presented herein is written into an identifiable constitutive program in Fortran language by using the incremental finite element format in (34).…”

Section: Finite Element Methods To Solve the Problem Of Artificial Fromentioning

confidence: 99%

A Study of Coupled Creep Damaged Constitutive Model of Artificial Frozen Soil

Chen

Zhou

2018

Advances in Materials Science and Engineering

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Artificial frozen soil is a kind of typical creep material, and the frozen clay under the unloading stress paths of high-confining pressure conforms to the improved the Zienkiewicz-Pande parabola-type yield criterion, and the Mohr-Coulomb yield function can describe the shear yield surface of artificial frozen clay under low-confining pressure. Based on the results of triaxial creep and shear tests for artificial frozen soil, the viscoplastic damage variable and evolution rule of artificial frozen clay were obtained by using the theory of viscoelastic-plastic mechanics and damage mechanics. An improved Zienkiewicz-Pande parabola-type yield criterion was used instead of a linear Newton body to obtain a coupled constitutive model of viscoelastic-plastic damage in the frozen soil under the unloading stress paths and to derive the coupling flexibility matrix for viscoelastic and viscoplastic damage. A finite element program of artificial frozen soil considering creep damage was written in the Visual Fortran 6.6A environment and embedded into the nonlinear finite element software ADINA as a user subroutine. e results of numerical simulation and laboratory testing were identical, with a maximum error of no more than 4.8%. is work shows that it is reasonable to describe the creep constitutive model of frozen soil with the viscoelastic-plastic-coupled constitutive model.

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“…Therefore, taking the instantaneous plastic strain as the elastic strain will inevitably lead to the decrease of the elastic modulus of salt rock with the increase of axial stress. In fact, for the convenience of calculation, the element model also treats the instantaneous strain generated in the loading process as the elastic strain (Hashiba and Fukui, 2016; Liu et al., 2015). In addition, we can see from Table 2 that parameters m and n also change with the axial stress, and with the increase of the axial stress, m gradually decreases, while n gradually increases.…”

Section: Model Verificationmentioning

confidence: 99%

Creep properties and damage constitutive model of salt rock under uniaxial compression

Wang

Zhang

Song

et al. 2019

International Journal of Damage Mechanics

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To study the creep property of salt rock, uniaxial compression creep tests on salt rock specimens were carried out. The test results indicate that there is no steady creep of the salt rock used in this test in a strict sense. Even in the steady creep stage, the creep rate of salt rock changes continuously over time, but with a relatively smaller change range. When the axial stress does not exceed 9.5 MPa, the isochronous stress–strain curve of salt rock is approximately straight. While the axial stress exceeds 9.5 MPa, the isochronous stress–strain curve deflects to the strain axis, and the larger the axial stress, the more obvious the deflection. Thus, the long-term strength of the salt rock used in this test can be determined as 9.5 MPa. A mathematical expression for predicting the creep failure time of rock is proposed on the basis of assuming the change rule of rock strength over time conforms to the Usher function. Then starting from the variation in deformation modulus with respect to time in the creep process of salt rock, the elastic modulus of the damaged rock material is characterized by the deformation modulus, and the creep damage evolution equation of rock is established. Combined with the continuous damage mechanics theory, a new creep damage constitutive model for rock is proposed. The rationality of the model is verified using the uniaxial compression creep test results of salt rock. The results show that the new model can not only describe the attenuation and the steady creep of salt rock under low stress level, but also reflect the whole creep failure process under high stress level. The predicted curves under different axial stresses are all in good agreement with the test data.

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A Nonlinear Creep Model of Rock Salt and Its Numerical Implement in FLAC^3D

Cited by 15 publications

References 14 publications

A damage constitutive model for multi-scale polypropylene fiber concrete under compression and its numerical implementation

A damage constitutive model for multi-scale polypropylene fiber concrete under compression and its numerical implementation

A Study of Coupled Creep Damaged Constitutive Model of Artificial Frozen Soil

Creep properties and damage constitutive model of salt rock under uniaxial compression

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A Nonlinear Creep Model of Rock Salt and Its Numerical Implement in FLAC3D

Cited by 15 publications

References 14 publications

A damage constitutive model for multi-scale polypropylene fiber concrete under compression and its numerical implementation

A damage constitutive model for multi-scale polypropylene fiber concrete under compression and its numerical implementation

A Study of Coupled Creep Damaged Constitutive Model of Artificial Frozen Soil

Creep properties and damage constitutive model of salt rock under uniaxial compression

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A Nonlinear Creep Model of Rock Salt and Its Numerical Implement in FLAC^3D