Showing papers in "International Journal of Mechanical Sciences in 1982"

TL;DR: In this article, a method based on the equilibrium of nodal forces is proposed by assuming the deforming metal to be a slightly compressible rigid-plastic material, which is more accurate than that of the simple extension of infinitesimal deformation when dealing with nonsteady problems, and is particularly effective for the processes in which the mode of deformation is sensitively changed by the distribution of flow stress and variation of shape.

TL;DR: In this article, a method of discretizing the die boundary conditions is considered for the analysis of metal forming processes by the rigid viscoplastic finite element method, and solutions of the spike forging process are obtained by using the method.

TL;DR: In this paper, the rigid-plastic finite element method for a slightly compressible material is applied to steady and non-steady state strip rolling, and solutions for some technical problems using a finite element analysis for rolling process are given.

TL;DR: In this paper, the critical conditions for the elastic buckling and the plastic buckling of the flange of a circular blank during the deep drawing process were obtained to improve upon previously given results.

TL;DR: In this article, a theoretical study of non-Newtonian flow effects in a squeeze film configuration is carried out with special reference to synovial joints, and the material model taken is that of the Stokes' couple stress fluid.

TL;DR: In this paper, a numerical formulation of a static method in limit analysis based on discretization in finite elements, is proposed, which leads to a separable programming problem if the medium obeys the von Mises yield criterion, or to a linear problem if it is a Tresca-Coulomb yield criterion.

TL;DR: A review of the literature on high velocity oblique impact and the ricochet of projectiles of various shapes is given in this article, with emphasis on long rod projectiles, and the mechanics of ricochet off solid, fluid and granular media are also discussed.

TL;DR: In this paper, an analytical model that is capable of predicting the development of nonuniform flow in sheet metals under various plane-stress loading conditions is presented, based on the previously formulated idea that the neck grows from the initial geometric or material inhomogeneity.

TL;DR: In this article, the authors considered cylindrical liquid storage tanks anchored to rigid base slabs and used finite elements for both liquid and tankwall, the natural frequencies of the coupled system were presented in graphical form for various tank dimensions, liquid depths and wall thicknesses.

TL;DR: In this paper, the differential equations of Wittrick are extended to allow large displacements of the helix and consistent geometric stiffness matrices are presented, and an investigation of static and dynamic stability and non-linear wave propagation is offered.

TL;DR: A complete formulation for the boundary element method applied to rate dependent material problems is presented in this article, where the only domain approximation involved is for the inelastic strains which are introduced into the analysis in initial stress form using piecewise linear interpolation functions.

TL;DR: In this paper, the velocity dependence of the penetration of semi-infinite metal targets by cylindrical projectiles is investigated, and a finite difference model is developed which treats the penetrator and target as colliding cylinders with the target strength increased by a constraint factor to account for surrounding material.

TL;DR: In this paper, a cable is supported at both ends by a heavy, elastic cable and the distance between the supports and the parameter K is governed by the relative importance of density and length to flexural rigidity.

TL;DR: In this article, the terminal state of rod after ricochet, i.e. whether it remains intact or is fragmented, is governed primarily by the initial speed of impact, and the critical impact speed above which the ricocheting rod is fragmented appears to be closely connected with the hydrodynamic transition velocity of the material.

TL;DR: In this article, a condensed review of finite element applications in metal forming processes is presented, which is based on a convenient explicit form of the hydrostatic-pressure load correction stiffness matrix for isoparametric and allied types of elements.

TL;DR: In this article, a perturbation method was used to examine the dynamic plastic buckling of a stringer-stiffened cylindrical shell subjected to an axial impact.

TL;DR: In this article, the geometrically nonlinear behavior of rigid-plastic shells is studied and a classification of theories is given in sequence, and the influence of large strains on the load surfaces is discussed.

TL;DR: In this article, the authors discuss the importance of the interaction between bending and stretching effects in shells, and show that the two surface model of shells provides a useful way of investigating this interaction at both the conceptual and the computational level.

TL;DR: In this paper, the steady state response of parametric vibration of a simply supported horizontal beam, carrying a concentrated mass at one end and subjected to a periodic axial displacement excitation at the other end under the influence of gravity, is treated.

TL;DR: In this article, a review of finite element, finite difference, dynamic relaxation, and energy methods for the analysis of plates, accounting for welding residual stresses and initial out-of-flatness, is presented.

TL;DR: In this article, a model of two parallel plates with reference to load bearing human joints is described, where the lower plate is porous and consists of three layers of different porosities and the lubricant (synovial fluid) is represented by a micropolar fluid.

TL;DR: In this article, the elastic strain rates of viscoplastic flow of metal during rolling were analyzed in a steady state, isothermal, analysis of viscopolynese flow.

TL;DR: In this paper, the authors examined the flow of a viscous incompressible liquid through a lobe-shaped tube with flexible walls and calculated velocity distributions and pressure-flow relationships analytically.

TL;DR: In this paper, the authors present general design criteria for designing pressure vessels to withstand external pressure, including combinations of dome ends, cones and cylinders, and use sophisticated analytical techniques to assist in meeting those criteria.

TL;DR: In this paper, a study of the deformation occurring during cold rolling using the experimentally-based visioplasticity technique is described, where aluminium specimens of different work-hardening characteristics and of various thicknesses were rolled with different reductions and various back and/or front tensions.

TL;DR: In this paper, the analysis of the complete collapse behaviour of uniform pin-ended steel columns is concerned with the failure of certain columns in a particularly violent manner, where the columns are assumed to follow an elastic-perfectly-plastic material stress-strain response.

TL;DR: In this article, a plane stress constitutive relation for rigid-plastic sheets under biaxial stretching is presented, in which the yield surface expansion models the behaviour of a solid carrying a rounded vertex at the loading point.

TL;DR: In this paper, a tensor valued tensor function of the stress and pre-strain was proposed to estimate the steady creep rate in the prestrain direction. But the tensor functions were not considered in this paper.

TL;DR: In this paper, theoretical predictions of the collapse behavior of thin rectangular aluminium plates are presented and discussed, based on the Ramberg-Osgood stress-strain formula, and two methods of using this formula are discussed: the usual percentage proof stress and the stress at which the plastic strain is a stated proportion of the elastic strain.

TL;DR: In this article, an analytical study was made of the complete collapse behaviour of axially loaded Shanley model columns with steel flanges, where the steel is assumed to be elastic-perfectly-plastic.