Genesis of deformational anisotropy in metals under a simple load

Bastun, V. N.

doi:10.1007/bf00882809

Soviet Applied Mechanics

1984

DOI: 10.1007/bf00882809

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Genesis of deformational anisotropy in metals under a simple load

V. N. Bastun¹

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2005

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“…As follows from experimental investigations of a wide range of structural metallic materials (hypopearlitic, austenitic, martensitic, maraging steels and titanium, aluminum, and copper alloys), strain hardening under simple and complex loading along paths of small curvature is well described by the hypothesis from [96]. The model based on this hypothesis allows us to evaluate the effect of strain hardening [37,63] and to solve Il'yushin's problem [33] of genesis of initial properties and states in general form [11][12][13] and to determine the stress-strain state and strength of structures by analyzing the strain hardening of their materials [3-5, 10, 18, 39, 40].…”

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Applied Problems in the Mechanics of Strain Hardening of Structural Metallic Materials

Bastun

Kaminskii

2005

Int Appl Mech

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Some applied problems of the mechanics of strain-hardening processes in metallic materials are considered. To solve these problems, the concept of loading surface, which separates the elastic and elastoplastic domains in the stress space, is used. Strain-hardening models are analyzed. For a wide range of steels and alloys, the most commonly used hypothesis of isotropic-and-kinematic hardening is experimentally justified Keywords: applied problems, strain hardening, metallic materials, loading surface Introduction. While manufactured, many metal members experience elastoplastic deformation. Examples of processes that induce such deformation are plastic working, hydraulic shaping of pressurized shells, expansion of welded large-diameter pipes, and autofrettage [7, 33, 37, 52, 54, 86, etc.]. Elastoplastic strains may also occur in members of space-rocket and aviation structures, which are characterized by a small margin of safety, during operation and in off-normal situations, under overloads.The elastoplastic deformation of polycrystallic materials, which include structural metals, is accompanied by structural transformations such as shattering and rotation of grains, formation of shear planes when parts of a crystal slide over each other, and preferred orientations (texture). The random orientation of crystals results in residual microstresses [36,51].Dislocation theory regards elastoplastic deformation as displacement of dislocations and increase in their density. The resistance of crystalline materials to deformation is determined by the mobility and density of dislocations. The stress fields of dislocations have a significant blocking effect on the hardening of materials [52].Some of the above-mentioned effects (shattering of grains, change of density and mobility of dislocations) lead to isotropic hardening, i.e., to approximately equal increase in resistance to deformation in different directions, while rotation of grains, preferred orientations and fibration, and residual microstresses make the hardening process directional. This results in anisotropy of mechanical properties. Its degree is determined by the contribution of one mechanism or another. In the case of unstable states, elastoplastic deformation is additionally accompanied by a change in the phase composition of the material. The physical fundamentals of strain hardening of metals are outlined in [7, 52, 57, 58, 64, etc.].Thus, elastoplastic deformation leads to unequal (in different directions) change in strength characteristics (yield points and ultimate strength). The change of the yield point was investigated most adequately in the case of a uniaxial stress state. Decrease in resistance to deformation due to reversal of the sign of the load is known as the Bauschinger effect, which is the simplest manifestation of strain hardening. The degree of strain hardening is determined by the ratio of yield points in two opposite directions, which is a measure of the Bauschinger effect.In the case of a complex stress state, strain hardening is judged fr...

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Applied Problems in the Mechanics of Strain Hardening of Structural Metallic Materials

Bastun

Kaminskii

2005

Int Appl Mech

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Genesis of deformational anisotropy in metals under a simple load

Cited by 1 publication

References 2 publications

Applied Problems in the Mechanics of Strain Hardening of Structural Metallic Materials

Applied Problems in the Mechanics of Strain Hardening of Structural Metallic Materials

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