Showing papers in "International Journal of Mechanical Sciences in 1994"

TL;DR: In this paper, the effects of changing strainpaths on forming limits of aluminum alloy 6111 T4 have been investigated by determining forming limit diagrams (FLDs) of specimens prestrained to several levels in uniaxial, plane strain and biaaxial tension, parallel and perpendicular to the prior rolling direction.

TL;DR: In this paper, the optimal layout of cantilever trusses with a horizontal axis of symmetry was derived in a closed analytical form by A. L. Chan and H. Y. Chan for a limited length: height ratio.

TL;DR: Closed-form solutions for the vibration problem of initially stressed thick rectangular plates as described by Mindlin theory are presented in this article, where the plates are simply supported and resting on Pasternak foundations.

TL;DR: In this paper, the authors investigate the possibility of correlating the aerodynamic loading of radial and mixed-flow turbines in some systematic manner, as is widely done and recognized for axial stages.

TL;DR: In this paper, a quasi-shallow shell is modeled by the Donnell-Mushtari-Vlasov (DMV) shell theory and a bifurcation functional is used to model the local wrinkling phenomenon.

TL;DR: In this paper, an experiment was performed to study the tearing energy in splitting square aluminium and mild steel tubes of thicknesses ranging from 0.47 to 1.67 mm, by driving four rollers each attached to the side wall of the tube leading to the bending of the wall to a constant curvature and, at the same time, the tearing along the four corners.

TL;DR: In this paper, the optimal bar layout and adjoint displacement fields were derived for cantilever trusses that are symmetric about a horizontal axis, and generalized to unsymmetric truss.

TL;DR: In this paper, the coupled thermomechanical problem of Hot Stochastic Pressing (HIPing) of metal powders during Stage I of the densification process is analyzed using analytical as well as numerical techniques.

TL;DR: In this article, roll forming of sheet metal is considered in terms of four fundamental types of deformation: longitudinal stretching, longitudinal bending, transverse bending and shear, and work expressions are developed for each deformation type.

TL;DR: In this article, the authors consider methods for calculating the pressure cycle which may be incorporated into a finite element program for simulating the forming process, and propose a finite-element program for the simulation of superplastic forming.

TL;DR: In this article, the equations of motion of a pre-twisted beam under axial compressive axial loads are formulated using Euler beam theory and the assumed mode method.

TL;DR: In this article, a new method for evaluating distribution of residual stresses in bent sheet metals is presented, where the authors have formulated the problem and shown that the springback and residual stresses can be expressed as a function of geometric parameters and material properties of sheet metals, e.g. bending curvature, thickness, Young's modulus, workhardening index, etc.

TL;DR: In this article, a theory of sandwich plates with composite-material facings and piezoelectric strip-stiffeners bonded to the surface or embedded in the facings is developed.

TL;DR: In this paper, the thermal assembly of an elastic-plastic ring and a solid disk is investigated based on Tresca's yield condition and the flow rule associated with it, the transient stress distribution is discussed and illustrated by numerical results.

TL;DR: Two and four degree of freedom (DOF) systems describing chatter in sheet rolling are investigated in this article, where the role of interstand tension in triggering instability is also discussed, and analytic expressions for the natural frequencies are provided.

TL;DR: In this article, an improved method of contact treatment is developed in which both the FEM (finite element method) mesh and the tool surfaces are described with parametric patches which have C 1 continuity or more.

TL;DR: In this article, an analytical method is developed for the bending response of annular sector Mindlin plates with two radial edges simply supported, and exact solutions are presented in the form of Levy-type series.

TL;DR: In this article, a plane-strain implicit dynamic finite element formulation is applied for the analysis of sheet-forming processes, where the material is assumed to follow a power law of hardening with strain-rate sensitivity once the initial elastic limit strain is reached.

TL;DR: In this paper, the exact modes of circular plates as shape functions in the Rayleigh-Ritz method were investigated, and the mass and stiffness matrices were expressed in closed form using Lommel integrals.

TL;DR: In this paper, a variational inequalities approach is proposed to solve the general frictional contact problem. But the proposed method avoids the use of user-defined penalty parameters, which ultimately govern the convergence and accuracy of the solution.

TL;DR: In this article, a set of internal type constitutive equations for hot working of aluminium alloys is proposed, and the values of the parameters in the constitutive functions are determined.

TL;DR: In this paper, a finite element analysis is carried out for steady-state three-dimensional helical extrusion of noncircular twisted sections, such as clover and trocoidal gear sections, through curved dies.

TL;DR: In this paper, the effect of the Stefan number on the stability of unidirectional solidification is investigated, under the simplifying assumption that the solidified material is linear elastic.

TL;DR: In this article, the thermoplastic response and densification behavior of porous alloy steel preforms under P M forging are studied at various initial relative densities, strain rates and temperatures.

TL;DR: In this article, a model of the tool/chip interface temperature distribution during orthogonal metal cutting is presented, where the shear plane is assumed to be inclined to the chip velocity as generally occurs.

TL;DR: In this paper, a theoretical analysis based on plastic shell theory and utilizing extremum and variational principles combined with numerical approaches was conducted to investigate the quasi-static flexural behaviour of mild steel circular pipes.

TL;DR: In this paper, a modified membrane finite element formulation is derived to take the bending effect into account for sheet metal forming analysis, which is applied to a cylindrical and a square cup drawing problem to confirm its validity.

TL;DR: In this article, the authors considered the behavior of a two-degree-of-freedom autonomous system with static and dynamic friction consisting of two blocks linked by springs on a moving belt.

TL;DR: In this article, the turning motion of snow skis is modeled via a single-ski representation followed by numerically solving the associated differential equations of motion, where the forces applied to the ski are assumed to be gravity, the longitudinal friction occurring between the ski and snow, and a skidding force (snow resistance force) corresponding to a system centripetal force and making curvilinear motion possible.

TL;DR: In this paper, the authors evaluated a previous uni-axial creep testpiece design which has slitted extensometer ridges to relieve the constraint to axial deformation provided by conventional, or unslitted, ridges.