Showing papers in "International Journal of Engineering Science in 1979"

TL;DR: In this paper, the authors deal with a continuum model for time-independent behavior of progressively fracturing solids and apply it to a wider class of engineering materials, i.e., metals in advanced yielding accompanied with microfracturing.

TL;DR: In this paper, an analysis is made of the nonlinear dynamics of a system composed of an unbonded planar interface separating two semi-infinite linear elastic media, and the second harmonic generation efficiency is determined as a function of the ratio of the ambient hydrostatic pressure to the stress amplitude of the incident wave.

TL;DR: In this article, a theory for the propagation of waves in a porous elastic solid containing a compressible viscous fluid using a homogenization process is developed, where the matrix is a lattice of periodically distributed gaps of arbitrary shape, the period of the lattice being small compared with the wave length.

TL;DR: In this paper, the flow of granular materials at high deformation rates and low stress levels is described using a micropolar continuum theory, and the constitutive equations are obtained by statistical inference; the interparticle interactions are first studied, and constitutive relations of the continuum theory are deduced by statistical averaging.

TL;DR: In this paper, the authors investigated the thermal instability in a layer of a ferromagnetic fluid rotating about a vertical axis and permeated by a vertical magnetic field, and found that overstability cannot occur if the Prandtl number P > 1.

TL;DR: In this article, a semi-infinite transversely isotropic medium with the plane boundary parallel to the plane of isotropy is solved by using the potential function method, where the Green's function solutions are expressed in terms of harmonic and bi-harmonic functions which are obtained by the separation of variables method.

TL;DR: In this article, a mathematical framework for the equations governing inelastic deformation under multi-dimensional stress states and for the associated evolution equations of the internal state variables is established, based on a generalization of the Prandtl-Reuss flow law.

TL;DR: In this paper, an analysis of axisymmetric stagnation flow on a circular cylinder performing a harmonic motion in its own plane is presented, and numerical solutions for the velocity functions are presented and wall values of the velocity gradients are tabulated.

TL;DR: In this paper, the attenuation coefficient associated with a random distribution of such cracks is derived for not too closely-spaced cracks, even when weak scattering density conditions are not satisfied.

TL;DR: In this paper, the authors considered the plane problem of a cracked elastic surface layer bonded to an elastic half space, where the surface layer is assumed to contain a transverse crack whose surface is subjected to uniform compression.

TL;DR: In this paper, the reinforcement effect of a strain gage bonded to a low modulus material is described by a simple equation that relates the assigned, calibrated gage factor, the actual gage factors at which the strain indicator may be set to record the actual strain in the test piece outside of the neighborhood of the gage site, and a certain parameter that depends on the physical and geometrical properties of the stringer and the specimen.

TL;DR: In this article, the effect of suction or injection on velocity, microrotation, temperature, skin friction coefficient, wall couple stress coefficient, displacement and momentum thicknesses, rate of heat transfer and adiabatic wall temperature have been studied.

TL;DR: In this paper, the role of distortion and velocity fields as potentials for dislocation density and dislocation current is shown and the equilibrium equation is recognized to be a guage condition.

TL;DR: In this paper, a steam-operated vortex tube is experimentally investigated, and some reasonable criteria and expressions to estimate the energy separation performance are also introduced, defined by the same as those of ideal gas in the high superheated region, and are well expressed independently of the degree of superheat, total mass flow rate and discharge resistance.

TL;DR: In this paper, the magnon-phonon couplings exhibited in elastic ferromagnetic bodies are studied on the basis of a purely continuum approach and its related mathematical methods, and the present part of the work is mostly devoted to establishing the equations that govern weak-field dynamical disturbances by the method of superimposition.

TL;DR: In this article, the problem of uniformly propagating finite crack in an infinite medium is solved using the dynamic equations of elasticity in 3-dimensions, and equal and opposite tractions are applied arbitrarily to the crack surfaces.

TL;DR: In this article, the authors deal with a generalization of the field theory formulation given by Kossecka and de Wit to dislocations and disclinations and obtain a natural gauge condition.

TL;DR: In this paper, the analysis of the singular stresses arising in a transversely isotropic infinite cylinder having a circumferential edge crack was studied and the problem was reduced to that of solving a singular integral equation of the first kind which was solved numerically by the use of the way proposed by Erdogan, Gupta and Cook.

TL;DR: In this paper, the propagation of Rayleigh waves in a semi-infinite body permeated by an uniform magnetostatic field parallel to the boundary surface is investigated and the roots of the frequency equation are calculated numerically.

TL;DR: In this paper, the transient thermal stresses in a transversely isotropic, finite, solid, circular cylinder resulting from a unsteady state, axisymmetrical temperature field are examined.

TL;DR: In this paper, a constitutive equation of a single form combining stress, strain, strain rate and temperature effect is proposed with which the various material behaviors can be described covering a wide range of strain rates, especially the high strain rates.

TL;DR: In this paper, the wave propagation problem in an elastic ferromagnet with viscous and spinrelaxation processes is considered, and analytical asymptotic expressions are obtained in terms of three small parameters, the first two measuring the alteration in the usual elastic speeds and the third one being related to the piezomagnetic effect induced by the initial state.

TL;DR: In this paper, the authors considered plate geometries for which the lubricant is a ferroliquid confined by an applied magnetic field to the gap between two plates, one fixed and one mounted on a rotating shaft carrying an axial load.

TL;DR: In this article, the authors derived an expression for the stress intensity at the rim of a flat elliptical crack in an infinite elastic solid under uniform tension using simple results concerning 2-dimensional Fourier transforms.

TL;DR: In this article, it is shown that the determination of the forces in a dynamical system, when the general form of the solution is given, generally requires the solution of a partial differential equation.

TL;DR: In this article, the authors employed the Hodograph transformation to obtain a partial differential equation of second order, which is exploited to obtain solutions for plane viscous incompressible flows with orthogonal magnetic and velocity fields.

TL;DR: In this article, a linear, transversely isotropic, elastic half-space is excited by a suddenly applied buried point source, and an integral transform solution is found for a restricted class of materials.

TL;DR: In this article, a simple relation between frequency interval and the minimum vibration amplitude required for producing a relatively pure traveling wave was found, numerically confirmed by tests on steel discs having accentuated frequency intervals.

TL;DR: In this paper, a different interpretation is suggested for some of the terms appearing in the theory of plate perforation advanced by Awerbuch and Bodner[1] and it is shown that these terms can be interpreted in different ways.