Experimental verification of the determining equations of the theory of plastic flow of anisotropic media

1991 ◽  
Vol 23 (11) ◽  
pp. 1161-1168 ◽  
Author(s):  
V. V. Kosarchuk ◽  
B. I. Koval'chuk ◽  
S. A. Mel'nikov
Keyword(s):  
Plastic Flow ◽  
Experimental Verification ◽  
Anisotropic Media ◽  
Theory Of Plastic Flow

Research of stamping of unequal channel bars. Part 3. Force parameters and shape change of the billet when extruding channels. 1. Kinematic and stress states of the billet

2021 ◽  
pp. 65-71
Author(s):  
A.L. Vorontsov
Keyword(s):  
Plastic Flow ◽  
Complete System ◽  
Shape Change ◽  
Plane Deformation ◽  
System Of Equations ◽  
Flow Rates ◽  
Die Forging ◽  
The Matrix ◽  
Stress States ◽  
Theory Of Plastic Flow

On the basis of the complete system of equations of the theory of plastic flow, the kinematic and stress states of the billet are determined when the channels are extruded under conditions of plane deformation of the misaligned position of the punch and the matrix. Keywords: die forging, extrusion, misaligned position, punch, matrix, plane deformation, plastic flow rates, stresses. [email protected]

Research of stamping of unequal channel bars. Part 3. Force parameters and shape change of the billet when extruding channels. 2. Determination of the extrusion force, maximum pressure on the matrix wall and the heights of the walls, taking into account the elastic deformation jf the matrix

2021 ◽  
pp. 63-69
Author(s):  
A.L. Vorontsov
Keyword(s):  
Plastic Flow ◽  
Elastic Deformation ◽  
Shape Change ◽  
Plane Deformation ◽  
Maximum Pressure ◽  
Extrusion Force ◽  
System Of Equations ◽  
The Matrix ◽  
Theory Of Plastic Flow

On the basis of the system of equations of the theory of plastic flow, the forces, the maximum pressure on the wall of the matrix and the heights of the obtained walls when extruding channels are determined, taking into account the elastic deformation of the matrix. Keywords: die forging, extrusion, misalignment, punch, matrix, plane deformation, stresses. [email protected]

scholarly journals A new theory of plastic flow

1949 ◽  
Vol 7 (2) ◽  
pp. 201-211 ◽  
Author(s):  
D. Trifan
Keyword(s):  
Plastic Flow ◽  
Theory Of Plastic Flow

PUNCHING CUPS WITH BOTTOM FLANGE BY DIRECT EXTRUSION WITH COUNTER-PUNCH. DETERMINATION OF THE DEFORMED STATE IN THE SECOND PERIPHERAL REGION OF PLASTIC DEFORMATION

2020 ◽  
pp. 13-17 ◽  
Author(s):  
A. L. Vorontsov ◽  
I. A. Nikiforov
Keyword(s):  
Plastic Deformation ◽  
Plastic Flow ◽  
Peripheral Region ◽  
Bottom Flange ◽  
Direct Extrusion ◽  
Deformed State ◽  
Theory Of Plastic Flow ◽  
Accumulated Deformation ◽  
Peripheral Regions

Using the theory of plastic flow according to the method of A. L. Vorontsov, formulas are obtained that are necessary for calculating the accumulated deformations obtained by extruding with a counter-punch a peripheral region adjacent to a container with a matrix. The average accumulated deformation in both peripheral regions was determined.

Studies on Plastic Flow of Anisotropic Metals

1956 ◽  
Vol 23 (3) ◽  
pp. 444-450
Author(s):  
L. W. Hu
Keyword(s):  
Stress Distribution ◽  
Internal Pressure ◽  
Strain Hardening ◽  
Plane Strain ◽  
Plastic Flow ◽  
Plane Stress ◽  
Biaxial Tension ◽  
Plastic Behavior ◽  
Theory Of Plastic Flow ◽  
Walled Cylinder

Abstract This investigation deals with a study of the plastic behavior of anisotropic metals. By extending Hill’s theory of plastic flow of anisotropic metals, plastic stress-strain relations for anisotropic materials with strain hardening are developed. Applications of these relations are also made to plane-stress and plane-strain problems with anisotropy. The effect of anisotropy on the stress distribution and on the pressure to produce yielding in a thick-walled cylinder under internal pressure is discussed. The influence of anisotropy on the interpretation of conventional biaxial tension-tension and tension-torsion tests is also considered in this study.

PUNCHING CUPS WITH BOTTOM FLANGE BY DIRECT EXTRUSION WITH COUNTER-PUNCH. DETERMINATION OF KINEMATIC AND STRESS STATES IN THE THIRD CENTRAL REGION OF PLASTIC DEFORMATION

2020 ◽  
pp. 20-23 ◽  
Author(s):  
A. L. Vorontsov ◽  
I. A. Nikiforov
Keyword(s):  
Plastic Deformation ◽  
Plastic Flow ◽  
Central Region ◽  
Bottom Flange ◽  
Direct Extrusion ◽  
The Third ◽  
Stress States ◽  
Theory Of Plastic Flow

Using the theory of plastic flow according to the method of A. L. Vorontsov, the formulas are obtained that are necessary for calculating the stresses and force parameters of extrusion with a counter-punch of the central region of plastic deformation adjacent to the formed wall of the product.

A Theoretical Investigation of Roll Flattening

1950 ◽  
Vol 163 (1) ◽  
pp. 141-148 ◽  
Author(s):  
D. R. Bland
Keyword(s):  
Fundamental Solution ◽  
Pressure Distribution ◽  
Plastic Flow ◽  
Peak Pressure ◽  
Quantitative Result ◽  
Roll Surface ◽  
Roll Flattening ◽  
Greater Curvature ◽  
Theory Of Plastic Flow ◽  
Limits Of Error

A method of finding the distortion of the roll surface when subject to a known pressure distribution is described. This method is then combined with a plastic-flow theory of rolling to determine the shape of the arc-of-contact and the pressure distribution over it when neither of these are known beforehand. Apart from the assumptions inherent in the theory of plastic flow, two assumptions only have been made: that the roll is in a state of plane strain and that the shape of the arc-of-contact is independent of the distribution of the balancing forces. The accuracy of the results is estimated to be 20 per cent. This paper shows that: first, it is not necessary to assume a parabolic pressure distribution to obtain a quantitative result; secondly, Hitchcock's solution (Hitchcock 1935)† is within the limits of error of the more fundamental solution and remains the most suitable method, for practical purposes, of allowing for roll flattening; thirdly, the main feature of the arc-of-contact is the depression in the region of peak pressure and the compensating greater curvature at both ends. This is a theoretical confirmation of Orowan's experiments (Orowan 1943).

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