Showing papers in "International Journal of Mechanical Sciences in 1987"

TL;DR: In this article, a popular fretting fatigue test, in which oscillating tension is applied in phase with the fretting force, is analyzed and it is shown that the addition of bulk tension has a substantial effect on the stick-slip geometry and the shear traction at the interface.

TL;DR: In this paper, a set of carefully instrumented tests on straight single seven-wire steel strands with various end restraints and subjected to static axial loads are reported in Part I of this study.

TL;DR: In this paper, a method is developed for the analysis of free vibration and buckling of generally laminated composite plates having arbitrary edge conditions, such as clamped, simply supported or free.

TL;DR: In this paper, a new theory of cold rolling thin metallic foil is proposed, where the work roll is allowed to deform to a non-circular profile and finite regions of no-slip between strip and work roll are allowed to occur.

TL;DR: In this paper, a comparison of two of the methods which are most frequently used, at present, for the solution of an unsteady flow in the pipe system of internal combustion engines is presented.

TL;DR: In this paper, the shape of the hysteresis loop is expressed in terms of two parameters: (i) the initial and reversal gradient s and (ii) the steady state torque Ts. Theoretical expressions are derived for both s and Ts.

TL;DR: In this article, a simulation of metal flow in slab rolling is presented, based on a three-dimensional elastic-plastic finite element method, which allows a detailed analysis of flow, including spread in the width of the workpiece.

TL;DR: In this paper, it was shown that certain critical speeds at which the spinning disk is unable to support arbitrary spatially fixed transverse loads are in the range of rotational speeds relevant in certain floppy disk magnetic recording applications.

TL;DR: In this article, the number of cracks depends on the diameter of the tube, the strength-to-toughness ratio of the metal and its hoop fracture strain eθ∫ (which may be related to microstructure via models of microvoid growth and coalescence).

TL;DR: In this paper, the use of "dual stream functions" in selecting a single approximating velocity field from a "sufficiently wide" orthogonalizing family is demonstrated.

TL;DR: In this paper, a finite-element method for analyzing plastic deformation of sintered powder metals is developed, and a variational principle for rigid-plastic deformation for porous metals is derived.

TL;DR: The adiabatic line in plane strain metal working is the ultimate outcome (usually in steel) of a heat line with the latter resulting from a tangential velocity discontinuity as mentioned in this paper.

TL;DR: In this paper, a numerical method for analyzing non-isothermal viscoplastic deformation problems has been developed, where a modified Bishop's method is used to solve the thermo-plasticity problem in decoupled form at each time step.

TL;DR: In this paper, a range of deformation mechanisms occur during dynamic crushing of a tightly-packed array of thin-walled metal tubes, and the final extent of the crushing is almost proportional to the ratio of the impact energy to an idealized energy dissipation capacity for a layer of cells.

TL;DR: In this paper, the authors proposed an extension of Marciniak and Kucźynski's inhomogeneous model, except that the roles of isotropic and Prager-Ziegler kinematic hardening have been examined in detail while the flow theory of plasticity is applied.

TL;DR: In this paper, a method for including a constitutive equation utilizing a single scalar internal variable in a model for transient thermomechanical phenomena is presented for determining material parameters in the context of a particular material (304 Stainless Steel).

TL;DR: In this paper, an incremental approach to the trial solution was devised to improve the convergence of the Newton-Raphson method for non-linear finite-element modeling (FEM) problems.

TL;DR: In this paper, the influence of material strain-rate sensitivity on neck propagation during the cold drawing of polymeric films is examined and the entire load-deformation behaviour of a rectangular specimen as well as the evolution of the specimen profile and the stress and strain distributions at various stages of the deformation process are computed.

TL;DR: In this paper, the mode approximation is modified by assuming that points on the plate surface move in a direction which is instantaneously normal to the current plate surface, which gives good predictions of the transverse displacement, and quite good estimates of in-plane strains.

TL;DR: In this paper, a simulation of the thinning development until fracture for superplastic material bulging deformation under hydrostatic pressure is realized by the rigid-viscoplastic finite-element method by introducing a model of cavity growth.

TL;DR: In this paper, an inlet zone analysis is incorporated in a previously developed hydrodynamic lubrication theory of hemispherical punch stretch forming, which identifies a dimensionless parameter that characterizes the state of lubrication at the punch-sheet interface.

TL;DR: In this paper, a dieless stepped bore reduction unit was proposed to eliminate the need for leader wire in wire drawing process, where the reduction of wire diameter is induced by the hydrodynamic action of the polymer melt within the dieless unit.

TL;DR: For cases I, II and III, the combinations of m and R which lead to concavity and unboundedness have been established as mentioned in this paper, and for cases IV and Hosford's criterion have no problem regions as long as m ⩾ 1.

TL;DR: In this article, the form of the contact pressure distribution for lead spheres plastically compressed between hard steel platens was examined and the mean contact pressure reached a maximum value of 0.6-0.7 times the Vickers hardness of the undeformed sphere when the sphere had been deformed.

TL;DR: In this paper, the authors investigated the mean flow and turbulence characteristics of two-dimensional wall jets along strong convex surfaces in an experimental manner, and they measured the mean velocities, Reynolds normal and shear stresses and dissipation across the wall jets.

TL;DR: In this paper, the elastic lateral buckling of monosymmetric cantilevers with a discrete intermediate brace is examined. And the buckling capacities are determined by direct minimization of the "generalized Rayleigh quotient".

TL;DR: In this paper, the authors presented slip-line field solutions of three-point bend specimens with different notch depths, notch angles and notch root radii for the constraint factor and maximum hydrostatic stress beneath the notch tip.

TL;DR: In this article, a two-dimensional plane-stress analysis of such a configuration is carried out, here, subjected to pin-bearing and/or biaxial-plate loading.

TL;DR: In this paper, a new kinematically admissible velocity field is suggested for the upper bound solution of three-dimensional hydroforming of regular polygonal boxes, in order to maintain the uniform wall thickness a back-up fluid pressure is controlled to vary with respect to the punch position during the hydroforming process.

TL;DR: In this article, the processes of extrusion and drawing of plastic solids through conical dies during rotation of solids are analyzed and the possibility to change and regulate the extrusion force by rotating is considered.