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Article
Extension of Prandtl’s solution to a general isotropic model of plasticity including internal variables
This paper presents a semi-analytic solution for the continued quasi-static compression of a thin rigid/plastic layer between two rigid, parallel rough plates. The constitutive equations of isotropic material ...
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Article
An accurate numerical method of solving singular boundary value problems for the stationary flow of granular materials and its application
The rigid/plastic solutions are singular near certain surfaces. A special numerical method is required to solve such boundary value problems. The present paper develops such a method for two models of pressure...
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Article
Effects of cold-rolling operation parameters on the surface quality of stainless steel and titanium strips with oil pits
The leading quality indicators of cold-rolled strip products include surface roughness and surface finish. The present study investigates the effects of the reduction ratio and lubrication condition (dry or lu...
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Article
Application of the upper bound theorem for metal forming processes considering an arbitrary isotropic pressure-independent yield criterion with no strength differential effect
The present paper concerns the application of the upper bound theorem based on the work function to analyze metal forming processes. An advantage of this theorem formulation is that it provides a unified metho...
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Article
A general stress solution in a plastic region near a traction-free boundary of arbitrary shape under plane-strain conditions
The stress field near voids (or holes, or pores) essentially contributes to the fracture process in metallic and nonmetallic materials. In contrast to strains, it is practically impossible to measure stresses ...
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Article
Finite strain expansion/contraction of a hollow sphere made of strain- and rate- hardening material
This paper presents a semi-analytic rigid/plastic solution for the expansion/contraction of a hollow sphere at large strains. The yield stress depends on the equivalent strain rate and the equivalent strain. N...
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Article
Open AccessA robust embedded load cell sensor for tool life prognosis and smart sawing of medium carbon steel
An embedded load cell sensor is proposed for the tool life prognosis and thrust force control of a band saw machine. The sensor enables the tool life and surface quality of the machined workpiece to be effecti...
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Article
A general kinematically admissible velocity field for axisymmetric forging and its application to hollow disk forging
An approach for selecting general kinematically admissible velocity fields for axisymmetric forging problems is outlined. The approach accounts for the existence of a rigid zone at frictional interfaces and fo...
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Article
Stress and strain fields in rotating elastic/plastic annular discs
The von Mises yield criterion is used in conjunction with its associated flow rule to provide the elastic/plastic stress and strain distributions within the rotating annular discs made of perfectly plastic mat...
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Article
Expansion/contraction of a spherical elastic/plastic shell revisited
A semi-analytic solution for the elastic/plastic distribution of stress and strain in a spherical shell subject to pressure over its inner and outer radii and subsequent unloading is presented. The Bauschinger...
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Article
An exact semi-analytic solution for residual stresses and strains within a thin hollow disc of pressure-sensitive material subject to thermal loading
There is considerable current interest in the development of constitutive equations for pressure-dependent plastic materials. In particular, in contrast to classical plasticity there is no commonly accepted re...
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Chapter
Effect of Pressure-Dependency of the Yield Criterion on the Strain Rate Intensity Factor
In the case of several rigid plastic models, the equivalent strain rate (quadratic invariant of the strain rate tensor) approaches infinity in the vicinity of maximum friction surfaces. The strain rate intensi...
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Article
Enlargement of a circular hole in a disc of plastically compressible material
A semi-analytic solution for the elastic/plastic distribution stress and strain in a thin annular disc subject to pressure over its inner radius is presented. It is assumed that a pressure-dependent yield crit...
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Article
An efficient method for the identification of the modified Cockroft–Latham fracture criterion at elevated temperature
The paper presents the theoretical part of a method for the identification of the modified Cockroft–Latham ductile fracture criterion at elevated temperature. Quite a general viscoplastic model is adopted to d...
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Article
Instrumented Indentation Investigation on the Viscoelastic Properties of Porcine Cartilage
Articular cartilage lubricates the contact surfaces in human joints and provides a shock-absorbing effect which protects the joint under dynamic loading. However, this shock-absorbing effect is gradually reduc...
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Article
Singular rigid/plastic solutions in anisotropic plasticity under plane strain conditions
Assuming a rigid plastic material model with arbitrary smooth yield criterion, it is shown that the plane strain solutions are singular in the vicinity of maximum friction surfaces. In particular, some compone...
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Chapter and Conference Paper
Effect of Anisotropy Parameters on the Initiation of Plastic Yielding in Thin Hollow Disks Subject to Thermomechanical Loading
A thin elastic–plastic annular disk subject to thermomechanical loading is considered. It is assumed that plastic yielding is controlled by Hill’s quadratic orthotropic yield criterion. A distinguished feature...
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Article
Influence of pressure dependence of the yield criterion on the strain-rate-intensity factor
The strain-rate-intensity factor is the coefficient of the principal singular term in an expansion of the equivalent strain rate in a series in the vicinity of maximum-friction surfaces. Its value controls the...
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Article
Damage evolution in an expanding/contracting hollow sphere at large strains
A generalization of one of the classical problems of plasticity theory, expansion/contraction of a hollow sphere, is proposed assuming that the conventional constitutive equations for rigid plastic, hardening ...
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Article
Particle Size Effects of Silicon Carbide on Wear Behavior of SiCp-Reinforced Magnesium Matrix Composites
This article investigated the particle size effect of micro-sized SiC on the tribological behavior of SiCp-reinforced AZ91D Mg-based metal–matrix composites (MMCs). The Mg MMCs were prepared by the melt-stirring ...
