Dynamic response of a non-circular lined tunnel with visco-elastic imperfect interface in the saturated poroelastic medium

Fang, Xue-Qian; Jin, Hexin

doi:10.1016/j.compgeo.2016.11.001

Cited by 30 publications

(8 citation statements)

References 15 publications

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“…The creep strain rate of the monofilaments increases gradually with the rise of applied stress. Fang adopted the visco‐elastic model with elastic and viscosity coefficients to analyze the interface effect around the noncircular‐lined tunnel. Lorandi studied the creep behavior of carbon/epoxy non‐crimp fabric composites by using Burger's model.…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature on tensile and creep‐recovery properties of braided polyester harness cord

Xie

Shen

2019

J of Applied Polymer Sci

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Tensile and creep‐recovery properties of braided polyester (PET) harness cord under various temperature and tension were studied by using an Instron universal tester. The study reveals that the tensile properties are highly related to the temperature, with a decrease of 29.6, 50.0, and 33.8% in initial modulus, yield force, and breaking force (BF), respectively, as increasing the temperature from 25 to 100 °C. Under the condition of 5% BF, the creep and recovery strain of harness cord increased by 185.7 and 353.8% separately, when the temperature increased from 40 to 100 °C, indicating the significant effect of temperature and tension on the creep‐recovery properties. The similar tendencies were also observed under the conditions of 10 and 15% BF. These results could be well described by Burgers four‐element model. During the 1.5 h creep test, only instant elastic and retarded elastic deformation could be observed and accounting for 56.1–84.3% and 15.2–43.4% of the total creep deformation, respectively. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47864.

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Section: Introductionmentioning

confidence: 99%

Effect of temperature on tensile and creep‐recovery properties of braided polyester harness cord

Xie

Shen

2019

J of Applied Polymer Sci

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“…Du et al [17] analyzed specimen shape and cross-section effects on rocks properties. More recently, Fang et al [18] analyzed the influence of a viscoelastic interface on the dynamic stress around the tunnel by means of numerical examples. Kung et al [19] concluded that the influence of tunnel radius on the earthquake stress increment was stronger than that of the tunnel depth by using ABAQUS.…”

Section: Introductionmentioning

confidence: 99%

Fracture Evaluation and Dynamic Stress Concentration of Granite Specimens Containing Elliptic Cavity under Dynamic Loading

Tao

Peng

et al. 2019

Energies

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The Split-Hopkinson pressure bar (SHPB) was used to determine the fracture characteristics of a long bar rock specimen with an elliptical cavity under different axial ratios and dip angles. A high speed camera was applied to record the fracturing process of the granite specimen around the cavity. The experimental results showed that the fracture characteristics around the elliptical cavity were closely related to the axial ratio and dip angle. A three-dimensional numerical model was established using LS-DYNA to quantitatively analyze the dynamic stress state around the cavity. The numerical results indicate that the dip angle and axial ratio of the elliptical cavity significantly affected the dynamic stress concentration factor (DSCF), then affected the rock failure. The location of higher DSCF led to a higher possibility of spalling failure. The maximum DSCF remarkably decreased with a decreasing dip angle and increased the axial ratio. In the dynamic loading propagate process, the stress concentration distribution around the cavity formed by a compression stress wave had a certain damaging effect on the destruction of rock around the cavity, and the stress concentration generated by the tensile stress wave was the main factor of the rock fracture, which was most notable in the peak area of the stress concentration.

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“…The wave function expansion method was used and the imperfect interface was modeled with a spring model in the paper [1,2]. Using the wave function expansion method and conformal transformation method, Fang et al [3][4][5][6] derived the dynamic stress around a non-circular tunnel with imperfect interface subjected to anti-plane shear waves, P waves and SV waves. The stiffness parameter and viscosity coefficient are used to take into account the visco-elastic characteristic of the interface.…”

Section: Introductionmentioning

confidence: 99%

Surface Effects on a Coated Fiber with an Imperfect Interface Subjected to Plane Compressional Wave

Lei¹,

Wang²,

Ou³

2019

IJAMTP

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With the rapid development of nanotechnology, nano-components and nano-materials will be widely concerned and applied. At the nano-scale, due to the obvious increase the ratio of surface area to the volume effect and surface effect of nano-components and nano-materials are significant, making their mechanical properties significantly different from the material properties under the macroscopic conditions. And in the practical cases, the interface is not always perfect and smooth, they always have a certain form of defects. Therefore, the wave function expansion method is used in the analytical solutions of dynamic stress concentration factor (DSCF) around a coated fiber with an imperfect interface at nano-scale. The stress boundary conditions on the interface are obtained by using the generalized Young-Laplace equation and the imperfect displacement boundary conditions on the interface are modeled by a spring model. Considering the effects of surface and spring model, the influence of spring stiffness, the number of incident wave and the surface effects on the DSCF are analyzed. The results show that the frequency of incident wave, the spring stiffness and the surface energy have significant effects on the dynamic stress concentration distributions of the nano-sized coated fiber. The smaller the spring coefficient is, the stronger the interface imperfection is, and the stronger the stress concentration at the boundary is. When the spring coefficient reaches a certain value, it is almost close to the dynamic stress value under the ideal interface. The DSCF are obviously different under different incident wave frequencies.

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Dynamic response of a non-circular lined tunnel with visco-elastic imperfect interface in the saturated poroelastic medium

Cited by 30 publications

References 15 publications

Effect of temperature on tensile and creep‐recovery properties of braided polyester harness cord

Effect of temperature on tensile and creep‐recovery properties of braided polyester harness cord

Fracture Evaluation and Dynamic Stress Concentration of Granite Specimens Containing Elliptic Cavity under Dynamic Loading

Surface Effects on a Coated Fiber with an Imperfect Interface Subjected to Plane Compressional Wave

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