×

Three-dimensional dynamic ring load and point load Green’s functions for continuously inhomogeneous viscoelastic transversely isotropic half-space. (English) Zbl 1403.74297

Summary: An analytical formulation is presented for three-dimensional Green’s functions of continuously inhomogeneous linear viscoelastic transversely isotropic half-space subjected to either ring load or point load. It is assumed that the elastic moduli of the half-space vary in terms of depth as bounded exponentially functions, while the mass density is constant. The method of potential functions is used to partially decouple the governing equations, after which Fourier series expansion followed by Hankel integral transforms is applied to transform the partial differential equations to ordinary differential equations (ODEs) with variable coefficients. Then, Frobenius series method is employed to determine the potential functions and then the displacements and stresses in the transformed domain, which are used to evaluate these functions in physical domain. The validity of the formulations and numerical process is shown for several simplified cases comparing with the known solutions in the literature. Finally, the displacement and stress Green’s functions are presented for several physical cases due to either unit ring load or unit point load. The results show that if the shear waves are produced in the interested direction, both inhomogeneity parameters and material damping may change the dynamic response of the half-space significantly, especially in high frequencies.

MSC:

74S30 Other numerical methods in solid mechanics (MSC2010)
65N80 Fundamental solutions, Green’s function methods, etc. for boundary value problems involving PDEs
74E05 Inhomogeneity in solid mechanics
Full Text: DOI

References:

[1] Brebbia, C.; Telles, J.; Wrobel, L., Boundary element techniques: theory and applications in engineering., 1, 984, (1984), Springer-Verlag Berlin · Zbl 0556.73086
[2] Manolis, G. D.; Beskos, D. E., Boundary element methods in elastodynamics, (1988), Taylor & Francis
[3] Aki K, Richards PG. Quantitative seismology: University Science Books; 2002.
[4] Gazetas, G., Analysis of machine foundation vibrations: state of the art, Int J Soil Dyn Earthq Eng, 2, 2, (1983)
[5] Das, B.; Ramana, G., Principles of soil dynamics, (2011), Cengage Learning Stanford
[6] Gazetas, G., Stresses and displacements in cross-anisotropic soils, J Geotech Geoenviron Eng, 108, (1982)
[7] Zhang, J.; Andrus, R. D.; Juang, C. H., Normalized shear modulus and material damping ratio relationships, J Geotech Geoenviron Eng, 131, 453, (2005)
[8] Cheshmehkani, S.; Eskandari-Ghadi, M., Dynamic response of axisymmetric transversely isotropic viscoelastic continuously ‎nonhomogeneous half-space, Soil Dyn Earthq Eng, 83, 14, (2016)
[9] Wang, C. D.; Lin, Y. T.; Jeng, Y. S.; Ruan, Z. W., Wave propagation in an inhomogeneous cross‐anisotropic medium, Int J Numer Anal Methods Geomech, 34, 711, (2010) · Zbl 1273.74152
[10] Wang, C. D.; Wang, W. J.; Lin, Y. T.; Ruan, Z. W., Wave propagation in an inhomogeneous transversely isotropic material obeying the generalized power law model, Arch Appl Mech, 82, 919, (2011) · Zbl 1293.74240
[11] Eskandari-Ghadi, M.; Amiri-Hezaveh, A., Wave propagations in exponentially graded transversely isotropic half-space with potential function method, Mech Mater, 68, 275, (2014)
[12] Vrettos, C.; Prange, B., Evaluation of in situ effective shear modulus from dispersion measurements, J Geotech Eng, 116, 1581, (1990)
[13] Vrettos, C., Dispersive SH-surface waves in soil deposits of variable shear modulus, Soil Dyn Earthq Eng, 9, 255, (1990)
[14] Vrettos, C., In‐plane vibrations of soil deposits with variable shear modulus: I. surface waves, Int J Numer Anal Methods Geomech, 14, 209, (1990) · Zbl 0702.73051
[15] Vrettos, C., In‐plane vibrations of soil deposits with variable shear modulus: II. line load, Int J Numer Anal Methods Geomech, 14, 649, (1990) · Zbl 0724.73198
[16] Vrettos, C., Forced anti-plane vibrations at the surface of an inhomogeneous half-space, Soil Dyn Earthq Eng, 10, 230, (1991)
[17] Vrettos, C., Time‐harmonic Boussinesq problem for a continuously non‐homogeneous soil, Earthq Eng Struct Dyn, 20, 961, (1991)
[18] Christensen, R., Theory of viscoelasticity: an introduction, (1982), Academic Press
[19] Borcherdt, R. D., Viscoelastic waves in layered media, (2009), Cambridge University Press · Zbl 1165.74001
[20] Luco, J. E., Vibrations of a rigid disc on a layered viscoelastic medium, Nucl Eng Des, 36, 325, (1976)
[21] Gazetas, G., Dynamic compliance matrix of rigid strip footing bonded to a viscoelastic cross anisotropic halfspace, Int J Mech Sci, 23, 547, (1981) · Zbl 0472.73135
[22] Ting, T. C.-t., Anisotropic elasticity: theory and applications, (1996), Oxford University Press on Demand · Zbl 0883.73001
[23] Wang, C.-Y., Two-dimensional elastostatic Green’s functions for general anisotropic solids and generalization of Stroh’s formalism, Int J Solids Struct, 31, 2591, (1994) · Zbl 0943.74510
[24] Pan, E.; Yuan, F., Three-dimensional Green’s functions in anisotropic bimaterials, Int J Solids Struct, 37, 5329, (2000) · Zbl 0992.74022
[25] Yang, B.; Pan, E., Three-dimensional Green’s functions in anisotropic trimaterials, Int J Solids Struct, 39, 2235, (2002) · Zbl 1045.74011
[26] Yuan, F.; Yang, S.; Yang, B., Three-dimensional Green’s functions for composite laminates, Int J Solids Struct, 40, 331, (2003) · Zbl 1022.74008
[27] Pan, E., Three-dimensional Green’s functions in anisotropic magneto-electro-elastic bimaterials, Z angew Math Phys ZAMP, 53, 815, (2002) · Zbl 1031.74024
[28] Qin, Q.-H., Green’s functions of magnetoelectroelastic solids with a half-plane boundary or bimaterial interface, Philos Mag Lett, 84, 771, (2004)
[29] Qin, Q.-H., 2D Green’s functions of defective magnetoelectroelastic solids under thermal loading, Eng Anal Bound Elem, 29, 577, (2005) · Zbl 1182.74052
[30] Yang, B.; Pan, E.; Tewary, V., Three-dimensional Green’s functions of steady-state motion in anisotropic half-spaces and bimaterials, Eng Anal Bound Elem, 28, 1069, (2004) · Zbl 1130.74362
[31] Rajapakse, R.; Wang, Y., Green’s functions for transversely isotropic elastic half space, J Eng Mech, 119, 1724, (1993)
[32] Rahimian, M.; Eskandari-Ghadi, M.; Pak, R. Y.; Khojasteh, A., Elastodynamic potential method for transversely isotropic solid, J Eng Mech, 133, 1134, (2007)
[33] Eskandari-Ghadi, M.; Pak, R.; Ardeshir-Behrestaghi, A., Transversely isotropic elastodynamic solution of a finite layer on an infinite subgrade under surface loads, Soil Dyn Earthq Eng, 28, 986, (2008)
[34] Khojasteh, A.; Rahimian, M.; Pak, R., Three-dimensional dynamic Green’s functions in transversely isotropic bi-materials, Int J Solids Struct, 45, 4952, (2008) · Zbl 1169.74443
[35] Eslami, H.; Gatmiri, B., Two formulations for dynamic response of a cylindrical cavity in cross‐anisotropic porous media, Int J Numer Anal Methods Geomech, 34, 331, (2010) · Zbl 1273.74078
[36] Eskandari-Ghadi, M., A complete solution of the wave equations for transversely isotropic media, J Elast, 81, 1, (2005) · Zbl 1092.74019
[37] Plevako, V., On the theory of elasticity of inhomogeneous media, J Appl Math Mech, 35, 806, (1971) · Zbl 0252.73013
[38] Ding, H.; Chen, W.; Zhang, L., Elasticity of transversely isotropic materials, (2006), Springer · Zbl 1101.74001
[39] Boyce, W.; DiPrima, R., Elementary differential equations and boundary value problem, (2001), Wiley and Sons · Zbl 0178.09001
[40] X. Zhang, M. Aggour., Damping determination of sands under different loadings. Electronic Proc, 11th World Conf on Earthquake Engineering: Elsevier Science; 1996
[41] Vrettos, C., The Boussinesq problem for soils with bounded non‐homogeneity, Int J Numer Anal Methods Geomech, 22, 655, (1998) · Zbl 0911.73056
This reference list is based on information provided by the publisher or from digital mathematics libraries. Its items are heuristically matched to zbMATH identifiers and may contain data conversion errors. In some cases that data have been complemented/enhanced by data from zbMATH Open. This attempts to reflect the references listed in the original paper as accurately as possible without claiming completeness or a perfect matching.