نتایج جستجو برای: anelasticity

تعداد نتایج: 129  

Journal: :Geophysical Journal International 2021

SUMMARY Long term deformations strongly depend on the earth model and its rheological parameters, in particular viscosity. We give general theory numerical scheme to compute them for any spherically non-rotating isotropic with linear rheology, either elastic or viscoelastic. Although Laplace transform (LT) is classically used viscoelastic deformation, we choose here instead, implement integrati...

2006
Don L. Anderson Hiroo Kanamori

The concept of a relaxation spectrum is used to compute the absorption and dispersion of a linear anelastic solid. The Boltzmann aftereffect equation is solved for a solid having a linear relationship between stress and strain and their first time derivatives, the 'standard linear solid', and having a distribution of relaxation times. The distribution function is chosen to give a nearly constan...

2007
EINAR KJARTANSSON

A linear model for attenuation of waves is presented, with Q, or the portion of energy lost during each cycle or wavelength, exactly independent of frequency. The wave propagation is completely specified by two parameters, e.g., Q and Co, a phase velocity at an arbitrary reference frequency w0. A simple exact derivation leads to an expression for the phase velocity c as a function of frequency:...

2012
ARASH YAVARI ALAIN GORIELY

The residual stress field of a nonlinear elastic solid with a spherically symmetric distribution of point defects is obtained explicitly using methods from differential geometry. The material manifold of a solid with distributed point defects—where the body is stress-free—is a flat Weyl manifold, i.e. a manifold with an affine connection that has non-metricity with vanishing traceless part, but...

2007

6.1 Abstract The relaxation processes of metallic glasses are investigated by observing the changes in material properties associated with the transient stress strain response of specimens subjected to isothermal deformations. The properties studied include the isoconfigurational shear modulus, configurational enthalpy, and the anelastic strain of the material. Conventional glass relaxation pro...

2004
Zdeněk P. Bažant Ferhun C. Caner

Presented is a new microplane model for concrete, labeled M5, which improves the representation of tensile cohesive fracture by eliminating spurious excessive lateral strains and stress locking for far postpeak tensile strains. To achieve improvement, a kinematically constrained microplane system simulating hardening nonlinear behavior (nearly identical to previous Model M4 stripped of tensile ...

2004
Zdeněk P. Bažant Ferhun C. Caner

Following the formulation of the constitutive model in the preceding Part I in this issue, the present Part II addresses the problems of computational algorithm and convergence of iterations. Typical numerical responses are demonstrated and the parameters of the model are calibrated by test data from the literature. DOI: 10.1061/(ASCE)0733-9399(2005)131:1(41) CE Database subject headings: Concr...

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