Showing papers in "International Journal of Mechanical Sciences in 1979"

TL;DR: The effect of the geometry of the bulge and the measuring procedure on the determination of biaxial stress-strain curves is examined in this paper, where it is shown that the shape of the top of a bulge is nearly spherical irrespective of the anisotropy of the sheet.

TL;DR: In this article, the quasi-static diametral compression of a tube constrained so that its horizontal diameter cannot increase is considered both theoretically and experimentally, and the relationship between the behaviour of a single tube and a nest of tubes is examined experimentally.

TL;DR: In this paper, a combined analytical and experimental study was performed on the ballistic resistance of layered targets, in particular of flat, relatively thin beams with clamped ends in spaced and laminated (i.e. in contact without bonding) conditions.

TL;DR: In this article, the temperature distributions in the workpiece, tool and chip during orthogonal machining are obtained numerically using the Galerkin approach of the finite element method for various cutting conditions.

TL;DR: In this paper, a method for introducing friction into the finite-element analysis is described, which is achieved by the inclusion of a layer of elements whose stiffness is modified by a function of the interfacial shear factor.

TL;DR: In this paper, the authors considered the effect of defects or cracks on the collapse load of thin walled pipe-bends under in-plane bending, and the results of the collapse tests on the bends without defects were in good agreement with limit analysis predictions, modified to account of the stiffening effect of tangent pipes.

TL;DR: Secondary buckling and post-secondary-buckling behaviors are theoretically studied for simply-supported rectangular plates, whose primary buckling modes of deflection contain more than half-waves in the load acting direction as discussed by the authors.

TL;DR: In this paper, a tensile testing machine was used to determine strain distributions and load-displacement points of sheet aluminum alloy (2036-T4) specimens of several geometries.

TL;DR: In this article, a modified Hopkinson bar was used to compress specimens of commercially-pure titanium, IMI 125 and titanium alloys, AMS 4911B and AMS4916B, at natural strain rates of between 3 × 10 3 s −1 and 3× 10 4 s − 1, and the results for the 4916B alloy at higher strain rates were too scattered to give a definite trend.

TL;DR: In this article, a numerical method is presented for calculating the pressure distribution and contact area shape between two elastic bodies of arbitrary profile which make contact over a slender contact area, where the relative curvature of the two profiles is much smaller in the longitudinal direction than in the transverse.

TL;DR: In this paper, the axisymmetric dynamic behavior of clamped isotropic and orthotropic spherical cap with central circular hole under a uniform step pressure of infinite duration is investigated, and critical loads are determined by using the rapidly converging Chebyshev series in a space domain and a Houbolt numerical integration scheme in time domain.

TL;DR: In this paper, a discrete model of an elastically clamped column is used, which consists of rigid segments that are joined by elastic hinges to each other and to the supports, and it is shown that the optimum is analytical when the elastic clamping is weak, but nonanalytical when it is strong.

TL;DR: In this paper, theoretical and experimental data are presented for the determination of the yield loci of textural sheet metals, and procedures for the calculation of the upper bound and lower bound solutions of restricted glide and pencil-glide polycrystalline yields are described.

TL;DR: In this paper, an analysis of boosted lubrication between two approaching solids, one of which is porous, is presented with reference to normally loaded living human joints, and the effect of concentration, shape and size of the micro molecules on the bearing characteristics is discussed.

TL;DR: In this paper, the authors presented the specimen geometries predicted by a finite element model of isothermal forging, which were shown by a number of computer produced plots of finite element meshes which represent the flow of the material at various stages during the forging process.

TL;DR: In this article, an experimental procedure for observing the flow of aluminium through near frictionless wedge-shaped plane strain extrusion dies is described and the selection of the billet size and shape, type of lubrication, die design and photographic grid printing technique are described.

TL;DR: In this paper, a theoretical analysis of the process of strain localization in the shear band has been carried out on the basis of the theory of plastic flow, where it is assumed that the material does not only undergo strain-hardening, but also strain-softening, due to the growth and coalescence of voids and microcracks.

TL;DR: In this paper, a combined analytical-experimental procedure has been developed for the determination of relevant mechanical properties of axisymmetric elastic and viscoelastic tubes, and the predictions of the theory are found to be in good correspondence with experimental results.

TL;DR: In this article, two strategies for smoothing the flow patterns obtained from grids photographically deposited on aluminium that is extruded through wedge shaped dies are presented, based on the equalisation of the curvilinear quadrilateral areas which make up the flow pattern.

TL;DR: In this paper, the results of 11 tests on single and two span circular hollow tubular beams are used to compare with inelastic bending and axial compression theories of buckling.

TL;DR: In this paper, a theory for the large, static, axial response of a helical spring formed of a strand of twisted wires is presented, where wires in the strand are assumed to be in frictionless contact with their neighbors throughout the deformation.

TL;DR: In this paper, a lower bound for the limit moment of a smooth circular pipe bend of uniform thickness is calculated with no restrictions on the geometry except those of thin shell theory, though the bend angle and the effect of any straight length attachments are not considered.

TL;DR: In this paper, the authors considered shakedown analysis problems for elastic-perfectly plastic solids subjected to quasi-static loads which vary arbitrarily within a given domain, and gave a general inequality which is able to generate Melan's theorem for shakedown, as well as bounds on plastic strains at any point of the solid.

TL;DR: In this article, a velocity field satisfying the limiting conditions is described for the closed-die cropping of rectangular bars, and the authors calculate flow lines and cropping force close to experimental results.

TL;DR: In this paper, the optical method of caustics was used for the evaluation of intensity, slope and curvature discontinuities of the most general load distribution along a straight boundary in a semi-infinite plane simulating the elastic contact of two bodies under conditions of generalized plane stress.

TL;DR: In this article, the optimal shape design of shoulder fillets in flat tension bars, round tension bars and at T -heads is considered by a mathematical programming method. And the successive optimum shapes are obtained by changing the limitation on the stress concentration factor (SCF), until minimum possible SCF limitation is reached.

TL;DR: In this paper, a more realistic model consisting of a mass between two preloaded non-linear (cubic elasticity springs) and restrained by a Coulomb and viscous damper is proposed.

TL;DR: In this paper, the effect of strain rate sensitivity on the delay in necking of sheet tensile specimens is analysed for a fairly general material constitutive law on the basis of two approximations, and the results are similar in form, although not in detail, to those of a previous analysis for round tensile bars.

TL;DR: In this paper, the deformed shape of a C-shaped spring is found to be a segment of a nodal elastica, and the load-deflection curve is almost linear over some range of deflection.