scholarly journals On the Advantages of the Theories of Plasticity with Singular Loading Surface

2014 ◽  
Vol 02 (11) ◽  
pp. 14-19 ◽  
Author(s):  
Andrew Rusinko ◽  
Daniel Fenyvesi
Keyword(s):  
Loading Surface

Strain Hardening of Annealed 304 Stainless Steel by Creep

1993 ◽  
Vol 115 (4) ◽  
pp. 345-350 ◽  
Author(s):  
Han-Chin Wu ◽  
Chin-Cheng Ho
Keyword(s):  
Stainless Steel ◽  
Strain Hardening ◽  
Kinematic Hardening ◽  
Constant Strain Rate ◽  
Transient Creep ◽  
304 Stainless Steel ◽  
Isotropic Hardening ◽  
Loading Surface ◽  
Before And After ◽  
Strain Hardening Behavior

Combined axial-torsional experiments have been conducted at room temperature on thin-walled tubes to investigate the strain hardening behavior of annealed 304 stainless steel due to creep. The constant strain-rate dynamic loading (or SCISR) surfaces representing the state of material before and after creep have benn determined. It has been found that transient creep essentially causes the loading surface to undergo kinematic hardening with insignificant amount of isotropic hardening for this material. A conclusion is drawn that the loading surface hardened by transient creep is the same as that hardened by plastic deformation. This is true both for specimens with pure tension and pure torsion loading paths. The results confirm assumptions of the overstress theory of viscoplasticity.

Formation of the Stress Field in the Vicinity of a Single Defect under Shock (Impulse) Loading

2013 ◽  
Vol 774-776 ◽  
pp. 1116-1121
Author(s):  
Marina Vasilyevna Polonik ◽  
Evgenii Valeryevich Murashkin
Keyword(s):  
Plastic Deformation ◽  
Stress Field ◽  
Residual Stresses ◽  
Impulse Loading ◽  
Loading Surface ◽  
Elastic Plastic ◽  
Considerable Distance ◽  
Single Defect

The formation of residual stresses in the vicinity of a single defect of continuity in the process of intense impulse loading surface with considerable distance from the defect is examined. Modeling is carried out within the framework of large elastic-plastic deformation. In the vicinity of the defect there is level of stress, leading to its elimination.

On the Mechanical Behavior of Viscoelastic/Plastic Solids

1963 ◽  
Vol 30 (3) ◽  
pp. 321-328 ◽  
Author(s):  
P. M. Naghdi ◽  
S. A. Murch
Keyword(s):  
Plastic Strain ◽  
Time History ◽  
Present Theory ◽  
Plastic Strain Rate ◽  
Plastic State ◽  
Strain Rates ◽  
Stress Space ◽  
Loading Surface ◽  
Rate Vector ◽  
History Of

This paper is concerned with a theory of viscoelastic/plastic solids which reduces to that of the classical (linear) viscoelasticity as one limiting case and to the (inviscid) theory of elastic/plastic solids in another. Whereas the viscoelastic strain rates are assumed to be derivable from the appropriate creep integral laws of classical viscoelasticity, the plastic strain rates in stress space are dependent not only on the path history but also the time history of stress. After postulating the existence of a regular loading surface in the viscoelastic-plastic state and deducing the appropriate criterion for loading, a major portion of the paper is devoted to establishing (a) the convexity of the loading surface, (b) the direction of the plastic strain-rate vector in stress space, and (c) the structure of the constitutive equations for the plastic strain rates. The loading surface of the present theory (in contrast to that of the inviscid theory of plasticity), being dependent on certain measures representing time history of stress, is allowed to change its shape continually; this has implications in the interpretation of experimental results dealing with the determination of the initial and subsequent yield surfaces where corners are observed.

Experimental investigation of the effect of of temperature on the parameters of the loading surface of steel 45

1978 ◽  
Vol 10 (7) ◽  
pp. 831-835
Author(s):  
B. I. Koval'chuk ◽  
A. A. Lebedev ◽  
I. V. Makovetskii
Keyword(s):  
Experimental Investigation ◽  
Loading Surface

The Compressive Strength of Ice Cubes of Different Sizes

1993 ◽  
Vol 115 (2) ◽  
pp. 142-148 ◽  
Author(s):  
G. A. Kuehn ◽  
E. M. Schulson ◽  
D. E. Jones ◽  
J. Zhang
Keyword(s):  
Grain Size ◽  
Compressive Strength ◽  
Boundary Conditions ◽  
Strain Rate ◽  
Side Length ◽  
Failure Strength ◽  
Loading Conditions ◽  
Compressive Failure ◽  
Loading Surface

Cubes of side length from 10 to 150 mm were prepared from freshwater granular ice of about 1 mm grain size and then compressed uniaxially to failure at −10° C. In addition to size, the variables were strain rate (10−5s−1 and 10−2s−1) and boundary conditions (ground brass plates, ground and polished brass plates, and brass brushes). The results showed that over the range investigated, size is not an important factor when considering the ductile compressive strength of ice. It also appears that size is not a factor when considering the brittle compressive failure strength under more ideal loading conditions. However, under less ideal conditions where perturbations on the loading surface may be significant, the brittle compressive strength decreases as the size of cube increases. In this case, the effect is attributed to nonsimultaneous failure.

A unified theory of elastic degradation and damage based on a loading surface

1994 ◽  
Vol 31 (20) ◽  
pp. 2835-2865 ◽  
Author(s):  
Ignacio Carol ◽  
Egidio Rizzi ◽  
Kaspar Willam
Keyword(s):  
Unified Theory ◽  
Loading Surface
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