Closure to “Frame Instability and Strain Hardening in Plastic Theory”

1967 ◽  
Vol 93 (4) ◽  
pp. 302-304
Author(s):  
J. Michael Davies
Keyword(s):  
Strain Hardening ◽  
Plastic Theory

Discussion of “Frame Instability and Strain Hardening in Plastic Theory”

1967 ◽  
Vol 93 (1) ◽  
pp. 587-596
Author(s):  
Peter F. Adams ◽  
Adel Helmy Salem ◽  
Anatol A. Eremin
Keyword(s):  
Strain Hardening ◽  
Plastic Theory

Extension of the Simple Plastic Theory to Take Account of the Strain-hardening Range

1951 ◽  
Vol 165 (1) ◽  
pp. 189-197 ◽  
Author(s):  
J. W. Roderick ◽  
J. Heyman
Keyword(s):  
Strain Hardening ◽  
Testing Machine ◽  
Theoretical Work ◽  
Carbon Steels ◽  
Low Carbon ◽  
Plastic Range ◽  
Lower Yield ◽  
Stress Strain ◽  
Good Support ◽  
Plastic Theory

In the simple plastic theory commonly used for mild steel it is assumed that after yielding has occurred in either tension or compression, straining can continue indefinitely at constant stress. Such an assumption has been found satisfactory for low carbon steels having a plastic range corresponding to eight to ten times the strain at yield, but for steels of greater strength this range is often considerably shorter, and it becomes necessary to take into account the strain-hardening range beyond. To obtain experimental data, four steels were selected, varying in carbon content from 0·28 to 0·89 per cent, and having widely different stress-strain relations. For each steel a number of simply supported beams of square section were subjected to a symmetrical two-point loading; tension specimens were prepared from the unyielded ends of these beams and tested in a spring-loaded autographic testing machine to determine upper and lower yield stresses. In addition, two tension specimens from each steel were tested in a lever type of machine, and the stress-strain relations through the plastic range and the initial stages of the strain-hardening range were obtained with the aid of a “Gerard” extensometer***. This information gave good support to the theoretical work, whereby the behaviour of these steels in flexure can be correlated with the tensile properties.

Rigid-Plastic Beams Under Uniformly Distributed Impulses

1965 ◽  
Vol 32 (3) ◽  
pp. 481-488 ◽  
Author(s):  
A. L. Florence ◽  
R. D. Firth
Keyword(s):  
Plastic Deformation ◽  
Strain Hardening ◽  
Large Deflections ◽  
Rigid Plastic ◽  
Clamped Beams ◽  
Plastic Theory

This paper contains the description and results of experiments in which pinned and clamped beams are subjected to uniformly distributed impulses large enough to cause considerable plastic deformation. The final permanent shapes are compared with those predicted by the rigid-plastic theory. They are also compared with the shapes predicted when the theory takes some account of large deflections and strain-hardening.

Frame Instability and Strain Hardening in Plastic Theory

1966 ◽  
Vol 92 (3) ◽  
pp. 1-16
Author(s):  
J. Michael Davies
Keyword(s):  
Strain Hardening ◽  
Plastic Theory

SELECTION OF THE DRIVE OF THE PULSE GENERATOR FOR WAVE DEFORMATION HARDENING

2020 ◽  
Author(s):  
Andrey Kirichek ◽  
Dmitriy Solovyev
Keyword(s):  
Strain Hardening ◽  
Pulse Generator ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Impact Frequency ◽  
Metal Consumption ◽  
Pulse Generators ◽  
Energy Impact ◽  
Deformation Hardening ◽  
Selection Of

The article is devoted to the analysis of known structures of impact devices used in industry in order to obtain recommendations for their adaptation or when creating new structures for wave strain hardening by surface plastic deformation. The analysis was carried out on the used drive and on the main parameters of impact devices: impact energy, impact frequency, relative metal consumption and efficiency. The options are the best combinations of parameters for electric, pneumatic and hydraulic drives. Recommendations are given on the use of such devices, with appropriate adaptation, as pulse generators for wave strain hardening.

MANUFACTURE INVESTIGATION OF CARTRIDGE WITH BOTTOM-MOST PART FLANGE BY DIRECT EXTRUSION WITH COUNTERPUNCH. REPORT 18. EXPERIMENTAL CHECK OF THEORETICAL RESULTS FOR DIFFERENT HOLLOW RADIUSES AND BOTTOM-MOST PART THICKNESSES

2020 ◽  
Vol 0 (9) ◽  
pp. 16-23
Author(s):  
A. L. Vorontsov ◽  
◽  
I. A. Nikiforov ◽  
Keyword(s):  
Strain Hardening ◽  
Theoretical Calculations ◽  
High Accuracy ◽  
Geometric Parameters ◽  
Strength Characteristics ◽  
Experimental Check ◽  
Hardening Material ◽  
Direct Extrusion ◽  
Theoretical Results

The results of an experimental check of the obtained theoretical formulae allowing us to determine the most important parameters of extrusion cartridges with a counterpunch for different hollow radiuses and bottom-most part thicknesses are presented. Characteristics of used tools, geometric parameters of extrusion experiments, strength characteristics of deformed materials and lubricants are described in detail. Both strain-hardening material and strain-unhardening material were studied. Methodology of the theoretical calculations is demonstrated in detail. High accuracy of the obtained design formulae was confirmed.

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