Showing papers in "Mechanics of Materials in 1986"

TL;DR: In this paper, the point force and line load in a linear elstic fluid-infiltrated porous solid are derived in a manner that emphasizes the relation to solutions for the homogeneous diffusion equation.

TL;DR: In this paper, two coupled, nonlinear differential equations are proposed for the modeling of the elastic and rate-dependent inelastic behavior of structural metals in the absence of recovery and aging.

TL;DR: In this paper, the effects of strain hardening, strain rate sensitivity, thermal softening, heat conduction and the imposed strain rate on the shear localization process in plane strain compression are examined.

TL;DR: In this paper, it was shown that in large deformation plasticity, the maximum-dissipation postulate is equivalent to a six-dimensional and not a nine-dimensional normality rule.

TL;DR: In this paper, the field and constitutive equations expressing the dynamic behavior of a partially saturated porous medium considered as a solid-fluid-gas system are developed, and corresponding governing equations are then constructed and subsequently linearized to form a system of 11 partial differential equations with 11 unknowns.

TL;DR: In this paper, a strength criterion with a dependence on fabric tensors is developed, where the tensile and compressive strengths in two directions, to the shear strength in the plane of the two directions and to the fabric tensor are derived.

TL;DR: In this paper, bounds on the overall elastic and instantaneous elastoplastic moduli of composites with periodic microstructures are found using the extremum principles of Hashin and Shtrikman (1962) and the analytic solution of Nemat-Nasser et al. (1982).

TL;DR: In this article, the conservation integrals for some interfacial cracks are applied to get the stress intensity factors in a very simple way without solving the complicated boundary value problems, and the integrals are shown to satisfy the conservation law under certain conditions on the interfaces.

TL;DR: In this article, a cell consisting of a single void within a thick shell of nonlinear matrix material, the dimensions of which are chosen to give a desired void fraction, is analyzed numerically to obtain an approximate expression for the equivalent matrix stress, from which a flow rule is derived.

TL;DR: In this article, the effects of material temperature sensitivity and heat conduction into an infinite band type analysis of shear localization were incorporated into finite geometry changes, but inertial effects are neglected.

TL;DR: An endochronic plasticity theory was developed in this paper to describe the nonlinear inelastic behavior of plain concrete over the stress range where significant cracking does not occur. The theory is isotropic and rate-independent.

TL;DR: In this article, a recent version of the equivalent channel model was used to interpret pore volume change data jointly with porosity and electrical resistivity data collected on the same rocks, and the variations of these three quantities with pressure were predicted very well by the model.

TL;DR: In this article, near-tip stress and strain fields for power-law hardening orthotropic materials under plane-strain conditions are presented, and the applicability of these fields in the context of a fiber-reinforced composite containing a macroscopic flaw is discussed.

TL;DR: In this article, the shape and growth pattern of voids that are periodically distributed over the grain boundaries in a viscous matrix is estimated, and the results are compared with calculations for a single void in an infinitely extended viscous solid, by Budiansky, Hutchinson and Slutsky.

TL;DR: In this article, the effect of imperfect bonding on the efficiency of load transfer is studied theoretically, where the authors consider an idealized two-dimensional fiber pullout test, consisting of a single fiber embedded in a half-plane.

TL;DR: In this article, a multiaxial constitutive law for time-dependent material behaviour is introduced for ice and extended to include tertiary creep, where the material is assumed to be isotropic during its elastic and recoverable viscous response while some stress anisotropy is admitted resulting from micro-cracking during permanent viscous deformations.

TL;DR: In this paper, constitutive equations for a power-law incompressible isotropic matrix containing penny-shaped cracks are presented and applied to a description of polycrystalline materials which develop grain boundary facet cracks when subjected to load at elevated temperatures.

TL;DR: In this paper, conditions that admit surface-instability in a laminated half-space that is subjected to radial compressional initial stress are investigated, and results are discussed in the particular case when one type of layer is thin, in comparison to layers of the other type.

TL;DR: In this paper, a new version of the effective field approach is presented with application to random fibrous composites, which incorporates the causality of the response and the static results, which comply with the best bounds available.

TL;DR: Weertman and Follansbee as discussed by the authors analyzed the dislocation produced plastic deformation that must occur behind the front of strong shock waves and concluded that a strong shock wave front has the following dislocation structure: the shock front, of atomic dimensions, consists of a Smith dislocation interface of dislocations that keep up with the front by moving at transonic or supersonic velocities.

TL;DR: In this paper, an analysis of the process of settling, solidification and consolidation of a sand liquefied by vibration in two centrifuge tests at different acceleration levels is presented.

TL;DR: In this article, a methodology for analytically mixing steel and concrete is explored, in an attempt to obtain a two-phase model of reinforced concrete, where an element containing representative volumes of rebar concrete cover is devoted to an element associated with a "cell" for dense steel layouts and a rebar-type for sparse layouts and explicit rebar element representations.

TL;DR: In this paper, a generalized crack-tip opening displacement criterion is introduced by which the strain and stress fields near the blunted crack tip are determined uniquely over a wide range of Mode I and II combinations.

TL;DR: In this paper, an approximate analysis of creep stresses in a Bridgman notched bar is given, in which both tension and combined tension-torsion are considered, and a triaxial tension takes place in the central part of the bar.

TL;DR: In this paper, the authors investigated the elastic interactions between two anisotropic spherical precipitates embedded in an anisometric elastic medium and their asymptotic behavior on the basis of an elastic field for two spheres.

TL;DR: In this paper, a set of constitutive relations are derived for the prediction of the average finite deformation of composite materials whose constituents are either nonlinearly elastic or non-linearly elastoplastic materials.

TL;DR: In this article, the simulation capability of the mixture model developed in a companion paper (Murakami and Hegemier, 1986), has been examined for the special case of steel-concrete bond action.

TL;DR: In this article, the interaction of a dislocational pile-up with the grain boundary at high temperature is studied in order to model a variety of practical possible grain defects which can be approached on the basis of the theory of continuously distributed dislocations.