Showing papers in "International Journal of Mechanical Sciences in 2000"

TL;DR: In this article, it is shown that the forming limit for both proportional loading and non-proportional loading can be explained from a single criterion which is based on the state of stress rather than the state-of-stress.

TL;DR: In this paper, a new approach is taken in that the analysis is made in two separate parts, namely, the work material side and the chip side of the shear plane and then combined.

TL;DR: In this paper, an incremental sheet metal forming process controlled three dimensionally by a computer has been accomplished, where a small local region of a sheet blank deforms incrementally by moving a hemispherical head tool over an arbitrary surface.

TL;DR: In this paper, a yield surface is proposed to describe cellular solids, including foamed metals, and designed to be fitted to three experimental results: (1) the compressive stress-strain response (including densification), (2) the difference between the tensile and compressive yield points and (3) the degree of compressibility of the foam, as measured by the lateral expansion during a uniaxial stress compression test.

TL;DR: In this article, the effect of sequential cuts and tool-chip friction on residual stresses in a machined layer was investigated using finite element code Abaqus, and the authors showed that residual stress is sensitive to the friction condition of the toolchip interface.

TL;DR: In this article, the failure of one open-and one closed-cell aluminum foam under biaxial and axisymmetric triaxial loading was measured and compared with three yield criteria for metallic foams.

TL;DR: In this article, a study of a special type of tape springs, that are both longitudinally and transversely curved, as required for the ribs of a deployable reflector is presented.

TL;DR: In this article, a modified energy approach utilizing energy equality and the effective dimensions of the region undergoing circumferential compression is proposed based on simplified flat or curved sheet models with approximate boundary conditions.

TL;DR: In this paper, a criterion for ductile fracture is combined with the finite element simulation to predict limit strains in biaxial stretching of sheet metals, and the predicted limit strains are in good agreement with the measured ones not only just at the fracture site but also at outside of the fracture sites.

TL;DR: In this article, the mechanical properties of two-phase IPCs are modelled and the numerical results are compared with the properties of composites with non-interpenetrating microstructure.

TL;DR: In this paper, a finite element model of a straight helical wire rope strand under axial loads (tensile and torsional) is presented, and the results showed better agreement with the experimental results of Utting and Jones than those calculated using the analytical strand model of Costello.

TL;DR: In this article, a finite element method (FEM) was used for the three-dimensional stress analysis of interference fitted connections, and two safety factors, λs and λp, were used to evaluate the quality of interference fits.

TL;DR: The stiffness of closed-cell low-density cellular solids, or solid foams, is affected by imperfections such as non-uniform cell shape and size, wavy distortions of cell walls, variations in cell wall thickness, etc as discussed by the authors.

TL;DR: In this article, the effect of non-proportional strain paths prior to the occurrence of flow localization in thin metal sheets is analyzed by using the M-K-model approach.

TL;DR: In this article, a homogenization theory for elastic-viscoplastic composites with periodic internal structures is developed in rate and incremental forms by considering unit cells subjected to macroscopically uniform stress and strain.

TL;DR: In this article, a model of oblique cutting for viscoplastic materials is presented, where thermomechanical properties and the inertia effects are accounted for to describe the material flow in the primary shear zone.

TL;DR: In this paper, normal inelastic contact between spherical bodies is examined theoretically and numerically and the analysis is focused on viscoplastic material behaviour, in particular the effect of Coulomb friction.

TL;DR: In this article, a systematic experimental investigation is presented on trimming of aluminum alloy autobody sheets, where the variations of cut surface quality and burr height are related to the cutting parameters of clearance, blade sharpness and cutting angle.

TL;DR: In this paper, the authors describe an experimental and modelling investigation of the mechanical and thermal expansion properties of stainless-steel/bronze composites produced by three-dimensional printing and show that the presence of thermal residual stresses and porosity contribute to a reduction in effective elastic moduli.

TL;DR: In this article, analytical and numerical considerations of buckling phenomena in thin plates or strips under in-plane loads which typically appear during rolling and levelling, i.e. straightening by stretching, of sheet metal are considered.

TL;DR: In this article, the influence of iron and small titanium and boron additions on the phase composition, microstructure and mechanical characteristic, particularly with respect to high-temperature deformation conditions, was investigated.

TL;DR: In this article, the effect of three important CWR parameters, namely the forming angle, the area reduction, and the friction coefficient, on the field variables has been investigated, including the first principal stresses, maximum shear stresses, etc.

TL;DR: Papini et al. as discussed by the authors used a rigid-plastic model of impact to predict crater size in a parametric study of the effect of particle size, shape, incident velocity, angle, particle orientation, and shape.

TL;DR: In this paper, a theoretical study on how to use saturation phenomena to design nonlinear vibration absorbers and how to improve their stability and effective frequency bandwidth is presented, and guidelines for designing nonlinear vibrational absorbers are derived.

TL;DR: In this article, a finite element simulation was performed to show the influence of different diameters of the working rolls and of the degree of reduction on the bending of the workpiece, which showed that the curvature may be caused by a speed difference, by a lubrication mismatch or a radius difference of work rolls, and depends on various rolling parameters.

TL;DR: In this paper, the authors present a model for the evolution of recrystallization texture, in which the absolute maximum internal stress direction due to dislocations generated during deformation or fabrication in the deformed material is aligned with the minimum Young's modulus direction in recrystonized grains, whereby the energy release during recrystization can be maximized.

TL;DR: In this paper, a finite element technique has been used to predict residual and thermal stresses which occur during water quenching of solid cylindrical rod and ring cross-sectioned steel tubes.

TL;DR: Li et al. as mentioned in this paper performed an experimental investigation on cut surface and burr in trimming aluminum autobody sheet and found that the localization zone is curved for the traditional 0° cutting and does not extend from the top blade tip to the bottom blade tip.

TL;DR: Papini et al. as discussed by the authors generalized the rigid-plastic theory due to Hutchings for square plates impacting frictionless surfaces, and studied the specific case of symmetric angular particles of arbitrary angularity.

TL;DR: In this paper, the effect on the buckling load of imperfections in the form of local initial stress, which are probably more typical of practice than purely geometric ones, was investigated.