Transient wave propagation phenomena at visco-elastic half-spaces under distributed surface loadings

Mesquita, Euclides; Antes, H.; Thomazo, Luiz Henrique; Adolph, Marco

doi:10.1590/s1679-78252012000400003

Cited by 4 publications

(7 citation statements)

References 53 publications

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“…The transient soil response will be obtained by means of a time convolution integral, relating the soil response due to unit (time) concentrated impulse to the actual loading function, in this case, the interface force F2(ti) (Mesquita et al, 2012). Both integration procedures will be detailed in the next session.…”

Section: Input-output Responsesmentioning

confidence: 99%

“…In this case the Newmark algorithm can render the displacement u1(ti) that fulfills the dynamic equilibrium equations of motion (Damasceno et al, 2013). For the soil, the convolution integral may be so formulated that given a force applied at the soil interface F2(ti), the convolution algorithm delivers the corresponding displacement u2(ti) (Damasceno et al, 2013;Tovo, 2018;Tovo et al, 2019) that corresponds to the solution of the soil differential equations of motion (Mesquita et al, 2012). This operation is called Mode 1.…”

Section: Input-output Responsesmentioning

confidence: 99%

“…It requires a domain integration and cannot be directly applied to unbounded domains. A non-singular transient influence functions for semi-unbounded domains based on viscoelastic frequency domain solutions and the application of the FFT algorithm was synthesized by Mesquita et al (2012). These solutions, which do not present singularities at the loading point (Barros and Mesquita, 1999) and require no integration regularization procedures (Dangla et al, 2005), were able to render accurate wave propagation phenomena for general linear viscoelastic models.…”

Section: Introductionmentioning

confidence: 99%

“…An indirect version of the BEM is applied to synthesize the frequency response of a circular rigid and massless foundation interacting with a viscoelastic half-space (soil model) ( Barros and Mesquita, 1999;Labaki et al, 2014). An accurate integration scheme allows to determine the frequency response for the soil-foundation at very high frequencies (Mesquita et al, 2012). This high frequency solution together with the FFT algorithm yield very accurate time response for the soil system, in which linear viscoelastic effects can be incorporated.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Iterative coupling procedure applied to the transient response of dynamic soil-structure systems

Tovo

Lima

Labaki

et al. 2020

Lat. Am. j. solids struct.

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Section: Input-output Responsesmentioning

confidence: 99%

Section: Input-output Responsesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Iterative coupling procedure applied to the transient response of dynamic soil-structure systems

Tovo

Lima

Labaki

et al. 2020

Lat. Am. j. solids struct.

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“…Many of these studies address the deformation of an elastic half-space or a half-plane under a nonstationary load. Some results of such studies are reported in [3,[6][7][8][9][10][11][13][14][15][16][17]. The problem of the deformation of an elastic half-plane under a nonstationary load applied to its boundary was addressed in [5].…”

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confidence: 99%

Nonstationary Load on the Surface of an Elastic Half-Strip

Kubenko

Yanchevskii

2015

Int Appl Mech

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A method for determining the stress-strain state of an elastic half-strip under a nonstationary load applied to its boundary is proposed. The corresponding initial-boundary-value problem is formulated. The Laplace transform is used and the solution is expanded into a Fourier series. The variation in the stress and displacement with time and space coordinates is studied Introduction. Studies of nonstationary processes in elastic bodies have an extensive bibliography. Many of these studies address the deformation of an elastic half-space or a half-plane under a nonstationary load. Some results of such studies are reported in [3,[6][7][8][9][10][11][13][14][15][16][17]. The problem of the deformation of an elastic half-plane under a nonstationary load applied to its boundary was addressed in [5]. Its solution was found by applying the Laplace transform with respect to time and the Fourier transform with respect to the linear coordinate running along the boundary. The joint transforms will be inverted using the Cagniard technique [12]. This technique, which is primarily applicable to transforms homogeneous in the transformation parameters, makes it possible to derive the exact expressions for the normal stress and displacement as functions of time and distance to the boundary for some types of external load.Here we develop a combined numerical/analytical approach to solving the problem under consideration for certain constraints on the time interval and for loads of quite general form. We will use the analytic solution from [5] to validate our results.The essence of the approach is as follows. Instead of an elastic half-plane, we will consider an elastic half-strip of certain width with such boundary conditions that the general solution for the wave potentials expanded into a Fourier series satisfy these conditions. The solution of the thus modified problem coincides with the solution of the original problem (for a half-plane) up to the instant the waves are reflected from the lateral edges. We will apply the Laplace transform with respect to the time variable and Fourier series expansion in the width coordinate of the strip.These transformations make it possible to separate out jump functions in the solution. For the remaining smooth portion of the solution, the inversion of the Laplace transform is reduced to the solution of a sequence of Volterra equations of the second kind. Our approach is similar to that applied in [13] to impact problems for a blunt body.1. Problem Formulation. Basic Equations. Let us address the plane problem for an elastic half-space under a nonstationary load applied to its surface (plane strain).We introduce Cartesian coordinates x, y, z such that the wave process occurs in the half-plane xz, and we will use the following dimensionless notation:

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Stress State of an Elastic Half-Plane under Nonstationary Loading

Kubenko

2015

Int Appl Mech

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A technique for determining the stress-strain state of an elastic half-plane under a nonstationary load applied to its boundary is developed. The corresponding boundary-value problem with initial conditions is formulated. Laplace and Fourier transforms are used. The inversion of the joint transform enables obtaining the exact analytical expressions for the stress and displacement as functions of time and the distance to the boundary for some types of loads Keywords: elastic plane problem, nonstationary process, stress-strain state, Laplace transform, Fourier transform, Cagniard techniqueIntroduction. The nonstationary problem of elasticity has a long history and has intensively been developed due to practical importance, specific features of the physical processes, and interesting aspects of solving the corresponding boundary-value problems. Particular attention is usually given to problems for half-spaces (axisymmetric problem) or half-planes (plane problem) that are most often subject to a shock load or a normal stress suddenly applied to the boundary. The major results achieved in this field can be found in [3,6,13]. Some approaches and features of studies are described in [8-10, 12, 14-17].We will find the analytic solution to the nonstationary plane problem of elasticity for a half-plane under a distributed nonstationary load (normal stress) suddenly applied to its surface. The general solution of the problem will be found using the Laplace and Fourier transforms. The transforms will be jointly inverted using the Cagniard technique [9]. Doing so will lead to the exact analytic expression for the normal stress on the axis of symmetry of the problem as a function of time and depth for two types of load (stress linearly or parabolically distributed over the half-plane surface).1. Let us address the plane problem for an elastic half-space under a nonstationary load applied to its surface. We introduce Cartesian coordinates x y z , , such that the wave process occurs in the half-plane xz, the x-axis is directed along the boundary of the half-plane, and the z-axis is directed deep into it (Fig. 1).It is assumed that the normal stress symmetric about the z-axis is induced at some initial time t = 0 and, in the general case, is a function of time and the coordinate x.We introduce the following dimensionless notation:

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Transient wave propagation phenomena at visco-elastic half-spaces under distributed surface loadings

Cited by 4 publications

References 53 publications

Iterative coupling procedure applied to the transient response of dynamic soil-structure systems

Iterative coupling procedure applied to the transient response of dynamic soil-structure systems

Nonstationary Load on the Surface of an Elastic Half-Strip

Stress State of an Elastic Half-Plane under Nonstationary Loading

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