Showing papers in "International Journal of Mechanical Sciences in 1985"

TL;DR: In this paper, the elastic contact of a two-dimensional sinusoidal surface with a flat surface with three-dimensional stress distribution is studied. But the authors only consider the case where the contact area changes shape from being circular to square and finally leaving a circular region of no contact when the waves are almost squashed flat.

TL;DR: In this paper, the author's criterion was modified so that it is expressed in terms of principal stresses rather than referring stresses to the symmetry axes, and the author also suggested that the criterion could be modified to express principal stresses instead of symmetry axes.

TL;DR: In this article, a general nonlinear theory has been developed to analyze complex wire rope, where the rope is considered to consist of several strands each comprised of a collection of helical wires and the nonlinear equations of equilibrium for bending and twisting of thin rods are applied.

TL;DR: In this paper, the critical fluid-pressure locus above which rupture by tensile instability may occur in the hydroforming deep-drawing process, is formulated and tested, based on the classical theory of plasticity (with simple power-law hardening and Mises-Hill normal anisotropic yielding).

TL;DR: In this paper, the rolling of a copper strip has been simulated using an elastic-plastic finite-element method (EPFEM) for plane-strain deformation.

TL;DR: In this paper, the orbital upsetting of rings has been analyzed for a Mises material by using an upper bound approach for calculating the forging forces, rocking die torques and ring profiles at each step of the process.

TL;DR: In this article, strip rolling is simulated using an elastic-plastic finite element technique which includes the extent of both elastic and plastic deformation outside the nominal contact deformation zone.

TL;DR: In this paper, the elastic flexural-torsional or lateral instability of monosymmetric I-beams and cantilevers is investigated using a general energy approach based on the vanishing of the second variation of the total potential energy in which the buckling displacements are represented by trigonometric series.

TL;DR: In this article, a generalised kinematically admissible velocity field is derived for axisymmetric extrusion through curved dies by employing rigid-plastic boundaries expressed in terms of arbitrarily chosen continuous functions.

TL;DR: In this paper, an incremental formulation incorporating the effect of shape change is derived for the non-steady large deformation problem of rate-independent rigid-plastic solids, and the deformation during a step is studied using the convective coordinate system.

TL;DR: In this paper, the deformation of semi-solid dendritic alloys is studied from a mechanical standpoint using a compressible viscoplastic constitutive model and axisymmetric extrusion.

TL;DR: In this article, an analytical model based on finite element method is presented for determination of the residual stresses of thermal and mechanical origin due to surface grinding process, and the temperature field within the workpiece is determined as the quasi-steady state temperature distribution due to the moving heat source.

TL;DR: In this paper, the feasibility of deep drawing aided by hydrodynamic flow beneath the blank is demonstrated and the analytical background for directing the design of the process is based on the limit analysis in plasticity theory coupled with flow analysis of viscous, non-inertial fluid.

TL;DR: In this paper, a new variational formulation is proposed for the rigid-plastic finite element analysis of large deformation processes, where the solution for each step is determined in a step-by-step procedure for non-steady metal forming problems.

TL;DR: In this paper, an energy-based analysis of flange buckling against lateral fluid pressure in deep drawing is considered, which is intended to explain the experimental fact that relatively low fluid pressure when applied to the flange area can suppress buckling.

TL;DR: In this article, the effects of initial geometric imperfections and in-plane boundary conditions on the large-amplitude vibration behavior of angle- and cross-ply rectangular thin plates were examined.

TL;DR: In this paper, an approximate analytical solution of the large deflection axisymmetric response of polar orthotropic thin spherical caps resting on elastic foundations is presented, where the Winkler, nonlinear Winkler and Pasternak models of the foundations are considered.

TL;DR: In this paper, a numerical method for constructing axisymmetric slipline fields for a Tresca material is discussed, which is applicable to problems of indirect type where the shape of the starting characteristics has to be found by solving a nonlinear integral equation.

TL;DR: In this article, the effects of cross-sectional warping, offset shear center and arbitrary orientation of an element in an assembled structure are examined, and the kinematics of a variety of joint intersections and stiffening schemes are incorporated.

TL;DR: In this article, a fracture criterion based on the Griffith fracture theory was proposed, in which failure is the result of the mutual action of both fracture and yielding mechanisms, whose contribution is included in the dilatational part T V of the strain energy density.

TL;DR: In this article, a first-order analysis for the growth of longwavelength inhomogeneities has been developed to predict the limit strains in biaxially loaded sheets.

TL;DR: In this paper, an elastic and elasto-plastic finite element analysis of the simultaneous indentations of a bounded solid by two flat plane rigid smooth punches under plane-strain conditions is presented.

TL;DR: In this article, the authors examined the relationship between natural frequency and compressive load for a conservative elastic mechanical system characterised by symmetric buckling and showed that the initial post-buckling curve is independent of axial inertia.

TL;DR: In this article, the stochastic theory of hydrodynamic lubrication of rough surfaces is used to study the effect of surface roughness on the response of a squeeze film between two rotating annular discs when one disc has a porous facing.

TL;DR: In this paper, stress-strain relations for plane strain compression are derived and predictions using these derived equations are compared with experimental results, and it is suggested that the discrepancies could arise because of the assumption of planar isotropy (via the use of an average r-value ) and because the exponent m apparently varies with induced strain.

TL;DR: In this paper, a finite element method has been used to investigate the thermal ratchetting behavior of thin tubes subjected to steady, internal pressure and cyclic, linear, through-thickness temperature distributions.

TL;DR: In this article, the authors determine the ranges of application of unimodal and bimodal optimisation techniques to the problem of a column supported by a Winkler medium.

TL;DR: In this paper, the authors applied Hill's yield function to a diaphragm of soft 70/30 brass brass and found that the new yield function gave the better correlation with the experiment.

TL;DR: In this article, an analysis of critical and post-critical behavior of cylinders under external pressure with widely spaced stiffeners is presented, and solutions are presented to show the effect of shell and ring geometric parameters on the critical loads and imperfection-sensitivity.

TL;DR: In this paper, a simply supported hollow steel beam is loaded impulsively by detonating a strip of sheet explosive along the top surface, using a fairly thick layer of styrofoam to spread the effect of the explosive strip.