Inspired by the symmetric collapse model of thin-walled tube under axial compression and expanding its applicable material type from the ideal plastic case to the linear hardening one,this dissertation for the first time proposes a zoning model to explore the local wrinkling characteristic of the THF.

Firstly, this paper analyzes the process of the linear hardening strip’s tension levelling on the basis of the theory of metal strip’s elasto-plastic deformation deeply, it also compares two kinds of different computing mehods of bending radius in combination with experimental data to obtain more reasonable bending radius and establishes experimental elongation model and tension loss model.

Based on the assumption of rigid and linear work-hardening, and the analogy between the deformation of the rigid and linear work-hardening beam after yield and the linear elastic beam, computing model and formula for air bending of sheet-metal V-shape are set up, program to calculate air bending force is realized and basic features of air bending are analyzed.

Based on the assumption of rigid and linear work-hardening, and the analogy between the deformation of the rigid and linear work-hardening beam after yield and the linear elastic beam, computing model and formula for air bending of sheet-metal V-shape are set up, program to calculate air bending force is realized and basic features of air bending are analyzed.

Basic space-time features of strain localization at the stages of yield plateau, easy glide, and linear hardening are established.

Stress field near an interface edge of linear hardening materials

The domain region of the elastic-plastic singular stress becomes larger with the increasing of the linear hardening coefficient.

When the linear hardening coefficient decreases to a certain value, the effective stress in most of the yield zone equals approximately the yield stress.

Either linear hardening or power law hardening uniaxial stress-strain curves are assumed in the analysis.

The main space-time characteristics of deformation localization at the stages of easy slip and linear strengthening in these single crystals are established.

The quantitative characteristics (wavelength, propagation velocity) of deformation waves that are formed at the stage of linear strengthening were determined.

Propagation of a load pulse in rods manufactured from an elastic-viscous-plastic material with linear strengthening

In the easy-glide and linear work-hardening stages of flow, waves of new type are found to propagate.

The linear work-hardening coefficient, the fracture time, the yield stress and the fracture stress of annealed and quenched samples decreased with increasing deformation temperature and exhibited a minimum at 733 K.

The constant 67-3 for a linear work-hardening solid where S is the dimensionless slope of the stress strain curve and 67-4 for a non-linear work-hardening solid where h is the work-hardening coefficient.

It predicts linear work-hardening, whereby the ratio of the work-hardening rate,H, to the shear modulus,G, is constant when a crystal is tested in the absence of recovery.

It predicts linear work-hardening, whereby the ratio of the work-hardening rate,H, to the shear modulus,G, is constant when a crystal is tested in the absence of recovery.

In the easy-glide and linear work-hardening stages of flow, waves of new type are found to propagate.

The linear work-hardening coefficient, the fracture time, the yield stress and the fracture stress of annealed and quenched samples decreased with increasing deformation temperature and exhibited a minimum at 733 K.

The constant 67-3 for a linear work-hardening solid where S is the dimensionless slope of the stress strain curve and 67-4 for a non-linear work-hardening solid where h is the work-hardening coefficient.

It predicts linear work-hardening, whereby the ratio of the work-hardening rate,H, to the shear modulus,G, is constant when a crystal is tested in the absence of recovery.

It predicts linear work-hardening, whereby the ratio of the work-hardening rate,H, to the shear modulus,G, is constant when a crystal is tested in the absence of recovery.

The deformation of rigidplastic ring under lateral compression is studied in this paper .The ring is linear hardening one. When laterally compressed by rigid plates ,instability occurs. The cause of instability is discussed and the critical condition is given.

Based on the theory of dynamic explicit elastic plastic FEM, the strip rolling process was simulated and analyzed. In the simulation, the roll was modeled by the rigid material and the strip by the bilinear isotropic hardening material. The rolling was carried out by the contact friction after the strip had moved towards to the roll gap with an initial velocity and bitten into the gap. The stress and strain distribution of the whole rolling process was obtained, including during the bite stage, the steady stage...

Based on the theory of dynamic explicit elastic plastic FEM, the strip rolling process was simulated and analyzed. In the simulation, the roll was modeled by the rigid material and the strip by the bilinear isotropic hardening material. The rolling was carried out by the contact friction after the strip had moved towards to the roll gap with an initial velocity and bitten into the gap. The stress and strain distribution of the whole rolling process was obtained, including during the bite stage, the steady stage and the exit stage. Out of the calculation results, the rolling pressures on the width symmetry center were compared with the experiment values. They are in good agreement. The calculation results also showed that there are a pre elastic deformation zone, a plastic deformation zone and an elastic recovery zone in the contact surface at the steady stage. The rolling pressure distribution along the contact surface varies much steeper at the entry and exit zones than at the middle zone.

By analyzing the defect of the Lee-Shaffer cutting model and emphasizing the existence of work harden process in the chip formation, an improved metal cutting model based on the linear reinforced elastic and plastic material is established. The parameter λ is defined as chip-tool contact ratio by which the lever of the chip curl can be determined. The results of theoretic analysis based on this new model are supported by the experiments.