Showing papers in "International Journal of Engineering Science in 1990"

TL;DR: Mori-Tanaka's theory with the general anisotropic constituents has been recast into a new form and it is shown that this form bears an identical structure to that developed by Walpole for the bounds as discussed by the authors.

TL;DR: In this article, the authors derived equations of motions, constitutive equations, and boundary conditions for a class of micromorphic elastic solids whose microelements can undergo expansions and contractions or stretch.

TL;DR: In this paper, the effective elastic moduli of three types of composite containing transversely isotropic spheroidal inclusions are explicitly derived, and the derived moduli are believed to be generally reliable, where the three extreme cases involving circular fibers, spheres, and thin discs all lie on or within the respective Hashin-Shtrikman-Walpole bounds.

TL;DR: In this article, the authors present and discuss various numerical studies on low speed frictional sliding phenomena which strongly suggest that classical interpretations for these phenomena should be critically re-examined and the role played by the dynamic properties of the experimental apparati should be carefully taken into account.

TL;DR: In this article, a new asymptotic-numerical method for the buckling analysis of imperfect elastic structures is presented, which improves the classical estimate given by the theories of postbuckling or perturbed bifurcation.

TL;DR: In this article, a constitutive model for anisotropic continuum damage mechanics using finite strain plasticity is presented, where the von Mises yield criterion is modified to include the effects of damage through the use of elastic energy equivalence.

TL;DR: In this article, a coupled theory of elasticity and continuum damage mechanics is formulated, where the material undergoes damage with small elastic strains and the hypothesis of elastic energy equivalence is used in order to produce the proposed coupling.

TL;DR: In this paper, the authors derived equations of motions, constitutive equations and boundary conditions for a class of thermo-micropolar fluids whose micro-elements can undergo dynamical expansions and contractions.

TL;DR: In this paper, the authors deal with the study of propagation reflection as well as transmission of magnetoelastic shear waves in a self-reinforced medium, and the results have been computed taking two self reinforced media one overlying another and presented graphically to compare with the reinforcement free cases.

TL;DR: In this paper, the authors deal with the acoustics of porous media saturated by an incompressible viscous or viscoelastic fluid and determine the macroscopically equivalent medium by using the homogenization method for periodic structures.

TL;DR: In this paper, a path independent J-integral integral is formulated for the problem of a crack in an eiastically deformable dielectric subject to electrostatic and mechanical load.

TL;DR: In this paper, critical Rayleigh numbers for both linear instability and nonlinear energy stability were found for convection in a fluid saturated porous layer, and numerical findings indicate that for the heat sources and gravity fields chosen, the growth rate of linear theory is real at criticality.

TL;DR: In this paper, a succinct implicit finite difference scheme is presented for the numerical solution of the diffusion equation, subject to u(x,0) = ƒ(x), 0 ≤ x ≤ 1, u x (1, t ) = g (t ), 0 t ≤ T, and the specification of mass ∫ 0 b u (x, t ) dx = M ( t ), 0 b

TL;DR: In this paper, the authors used piecewise linear constitutive equations for elastic and viscoelastic cases in order to study the qualitative behaviour of phase transition phenomena, and the numerical method of characteristics used here to compute the visco-elastic solutions may lead to numerical instabilities.

TL;DR: In this paper, a method for the numerical solution of the diffusion equation u t = u xx + ƒ(x, t), 0, 0, subject to u(x x, 0) = v(x), 0, and nonlocal boundary specifications u(0,t)= ∫ 0 1 φ (x,t)u(x,t)dx, 0 u(1,t), ∫ 1 ψ(x and t)

TL;DR: In this article, the distribution of deformation, temperature, stresses and magnetic field in a homogeneous isotropic, thermally and electrically conducting, uniformly rotating elastic half-space, in contact with vacuum, due to (i) normal load and (ii) impulsive load, at the plane boundary, in the context of generalised theory of thermoelasticity was investigated.

TL;DR: In this paper, the authors derived an expression for the stress tensor of a granular material that can exhibit normal-stress effects due to a solids fraction gradient using both the continuum and kinetic models.

TL;DR: In this article, a systematic inversion scheme is presented to determine the cohesive properties of adhesive bonds from guided wave phase velocity data, which is based on an iterative least-squares procedure in which the nonlinear perturbation of the unknown parameters is linearized at each step.

TL;DR: In this article, the authors studied Galerkin approximations to the solution of heat equation u t = Δu + ƒ(x, t) in Q T = Ω × (0, T), t > 0 subject to the following integral boundary condition.

TL;DR: In this paper, boundary layer solutions are presented to study the effects of buoyancy on forced convective micropolar fluid flow and heat transfer in stagnation flows using the theory of Eringen.

TL;DR: In this paper, a chemically stimulated muscle-like actuator was used in a robotic arm to determine the feasibility of producing a new power system with an excellent power/weight ratio.

TL;DR: Using the theory of micropolar fluids due to Eringen, asymptotic boundary layer solutions are presented in this article to study the combined convection from a vertical semi-infinite plate to a micropolastic fluid.

TL;DR: In this paper, the authors describe a mechanistic model which gives an insight into the way the granules respond when bulk granular materials are deformed, which can be used to obtain approximate solutions to boundary value problems.

TL;DR: In this article, a complete set of nonlinear partial differential equations and accompanying boundary conditions are proposed with a view to studying both bulk and surface nonlinear wave-propagation phenomena in centrosymmetric magnetostrictive elastic conductors.

TL;DR: In this paper, a thin disk of compressible elastic material is subjected to a uniform radial tension and it is shown numerically that solutions containing a cavity exist provided that the tension exceeds some modest value.

TL;DR: In this article, it was shown that the full field stresses will approach to the appropriate static value upon arrival of the shear wave diffracted by the Rayleigh wave from the crack tip.

TL;DR: In this paper, the original coupled governing equations for the displacements and micro-rotations of micropolar plates have been reduced to the uncoupled equations of the same order for the new displacement functions.

TL;DR: In this article, an integral transform technique is employed to solve the elastodynamic problem of a crack propagating with a constant speed in a stressed orthotropic strip of finite thickness and is located in a plane of elastic symmetry of the material.

TL;DR: In this article, the authors established a reciprocal theorem for quasi-static and dynamic piezoelectricity and showed that the reciprocity relation implies new uniqueness results and minimum principles.

TL;DR: In this article, the analysis of steady laminar forced convection boundary layer of power-law non-Newtonian fluids on a continuously moving cylinder with the surface maintained at a uniform temperature or uniform heat flux is presented.