Showing papers in "International Journal of Mechanical Sciences in 1990"

TL;DR: In this paper, the use of the finite element technique was used to predict fracture initiation in a range of simple metalforming operations, including simple upsetting, axisymmetric extrusion, and strip compression and tension.

TL;DR: In this paper, a finite element model to simulate friction welding is developed to represent the workpieces and surface contact conditions, and predictions of the temperature distribution, thermal expansion and thermo-plastic stresses are obtained from this model.

TL;DR: In this paper, the critical buckling loads of simply supported, rectangular, laminated composite plates subjected to five types of loading conditions: (1) uniaxial, (2) hydrostatic biaxials, (3) compression-tension biaaxial,(4) positive shear and (5) negative shear.

TL;DR: It is shown that the results of other workers obtained by use of drop-hammer tests may be correlated in the same way, though with somewhat different values of C1.3; and the effects of inertia, variation of friction with sliding velocity and material strain-rate effects are discussed.

TL;DR: In this paper, simple approximate solutions due to Jaffar and Johnson for the indentation by a rigid frictionless punch of a thin elastic layer on a rigid foundation are extended to the corresponding general three-dimensional problem.

TL;DR: In this article, the optimal layout of least-weight grillages or beam systems of given depth has been determined in a closed analytical form for almost all conceivable boundary and load conditions, and it is shown that for this less restricted case the solutions correspond to fields of constant strain, which give layouts consisting of a finite number of straight members.

TL;DR: Yang et al. as mentioned in this paper proposed a three-dimensional remeshing scheme implemented by using a modular concept for the finite element analysis of a complicated forging process, which can be extended to other more complicated product geometry.

TL;DR: In this article, a methodology has been developed for the numerical determination of the material constants in the uniaxial creep constitutive equations based on continuum damage mechanics, and the method developed overcomes former problems with convergence, and is based on a normalization technique.

TL;DR: In this article, the authors developed models for the failure of both isotropic and anisotropic brittle cellular solids under multiaxial stress conditions and compared the results of the models with data from biaxia and axisymmetric tests on reticulated carbon foams; the overall agreement between the models and test results is satisfactory.

TL;DR: In this article, an analysis method was developed that predicts the strain distribution in deep drawn sheet parts based on plane stress characteristic theory, which neglects both normal and shear stresses acting across the thickness of the material.

TL;DR: In this article, two computer programs, based respectively on interlacing and non-interlacing finite-differences, have been developed for numerical solution of these equations, which have been verified by analysing a variety of thin and moderately thick plate problems for which alternative solutions are available.

TL;DR: In this article, a simplified two parameter creep curve model is developed, which represents primary-secondary-tertiary creep behaviour, and a two bar plane strain model component subjected to steady load is studied and used to determine the effect on the component lifetime of primary creep; and, of the multi-axial creep rupture criterion.

TL;DR: In this paper, an approximate solution for the contact area and the load-penetiation relation for frictionless indentation of the elastic half-space by a punch of arbitrary profile was developed.

TL;DR: When an individual wire in a multilayered cable is treated as a helical rod, the equilibrium conditions and kinematic constraints imposed by uniform extension and twisting of the cable lead to the result that the only interwire friction forces which can occur form couples which oppose change of the lay angles.

TL;DR: In this paper, the static deflections and natural frequencies of isotropic, orthotropic/laminated composite plates using a Levy-type solution were analyzed using the Mindlin plate theory in conjunction with the state-space concept.

TL;DR: In this article, a couple stress fluid was used as a lubricant for lightly loaded cylinders with combined rolling, sliding and normal motion under cavitation boundary conditions, and it was shown that the major bearing performance characteristics can be accounted for by means of a dimensionless parameter, q, involving the normal and training velocities, the minimum film thickness and the radius of the geometrically equivalent cylinder near a plane.

TL;DR: In this paper, a highly accurate and computationally efficient numerical method was developed for the flexural vibration of isotropic and orthotropic triangular plates, where a set of two-dimensional orthogonal plate functions was used as an admissible displacement function in the Rayleigh-Ritz method to obtain the natural frequencies and mode shapes for the plates.

TL;DR: In this article, the authors investigated the thermocoupled flow localization of plane strain tension blocks with a relatively low strain rate sensitivity and comply with an elasto-viscoplastic constitutive equation which has a viscoplastic strain rate noncoaxial with the stress tensor.

TL;DR: In this paper, a method for the rigid-plastic finite element analysis of sheet metal forming with contact is proposed, where a method of initial guess generation is devised by using the elastic finite element method with geometrical nonlinearity combined with the proposed contact treatment.

TL;DR: In this paper, a new method based on the Multiple Points Over-deterministic (MPOD) method and incorporating a fuller expansion of the crack-tip stress series due to Westergarrd was introduced.

TL;DR: In this paper, a numerical scheme with a Ramberg-Osgood type stress-strain relationship has been prepared which determines the elastic-plastic boundary in addition to springback in the bars.

TL;DR: Dawe and Craig as discussed by the authors presented a finite strip method for the prediction of buckling stresses and natural frequencies of vibration of "long" prismatic plate structures which may be formed of fiber-reinforced, composite, laminated material with very general properties.

TL;DR: In this article, a least squares technique is applied to estimate the mass, stiffness and damping parameters in the spatial model of a portal frame, which can be used to attribute changes in the observed motion of a machine to incipient failure of a component.

TL;DR: In this paper, an Eulerian finite element model is presented to describe three-dimensional, non-uniform effects in steady-state rolling or drawing processes, which employs a number of simplifying kinematic assumptions which preserve the essential physics of the problem.

TL;DR: In this article, a non-quadratic orthotropic yield criterion was developed for metal sheet anisotropic problems, which does not have those limitations which existing non-squareanisotropic yield criteria have, and its material constants including the exponent in the yield criterion can be determined by performing a kind of uniaxial tension test.

TL;DR: In this paper, a rigid-plastic flow theory law which incorporates both material strain-rate sensitivity and thermal softening properties is employed for steady-state loading conditions and the destabilizing effect of deformation-induced heating is investigated where the thermomechanical response is assumed to take place under adiabatic conditions.

TL;DR: In this article, a method of numerical analysis based on the method of weighted residuals was employed to calculate the stresses and strains in 3D cold extrusion of arbitrarily shaped sections from round billets through continuous dies.

TL;DR: In this article, a structural modification method based on Rayleigh quotient iteration (RQI) is presented to show the applicability of sensitivity analysis on a lumped spring-mass system with 7 degrees-of-freedom (7DoF).

TL;DR: In this article, a parametric experimental study was carried out for a column with N = 3, with each stay frame consisting of a very slender bipod and two stays and all connections were push fits except for grub screws which keep the stays tensioned.

TL;DR: In this paper, a finite element simulation completely characterizes the development of axisymmetric necks and bulges and their propagation in an axial direction for a polymeric cylinder under internal pressure under axially plane strain conditions.