scholarly journals Prediction of yield condition for plastics under biaxial stress fields.

1986 ◽  
Vol 35 (398) ◽  
pp. 1267-1271
Author(s):  
Tadae MORISHITA
Keyword(s):  
Yield Condition ◽  
Biaxial Stress ◽  
Stress Fields

Numerical Stress Analysis of the Biaxial Tension-Compression Wedge-Splitting Test in Vicinity of the Crack Tip

2018 ◽  
Vol 784 ◽  
pp. 85-90
Author(s):  
Stanislav Seitl ◽  
Petr Miarka ◽  
Ildikó Merta ◽  
Zbyněk Keršner
Keyword(s):  
Stress Analysis ◽  
Mechanical Test ◽  
Biaxial Tension ◽  
Crack Tip ◽  
Biaxial Stress ◽  
Stress Fields ◽  
Wedge Splitting Test ◽  
Splitting Test ◽  
Compression Wedge ◽  
Wedge Splitting

Wedge-splitting test is widely used fracture mechanical test for its stability in measurement during the testing and many papers were published. However, the biaxial wedge-splitting test is relatively a new method and the numerical stress analysis of such test is necessary. Especially the investigation of the stress fields in the vicinity of the crack tip. In this contribution, influence of various biaxial stress level is discussed on values of first and second terms of William’s expansion.

Deformation Bounds for Bodies Which Creep in the Plastic Range

1970 ◽  
Vol 37 (2) ◽  
pp. 426-430 ◽  
Author(s):  
F. A. Leckie ◽  
A. R. S. Ponter
Keyword(s):  
Energy Dissipation ◽  
Yield Condition ◽  
Stress Fields ◽  
Plastic Range ◽  
Plastic Deformations

Previous results on bounding the energy dissipation of bodies which creep have been extended to include plastic deformations. The theorems, which are derived, show that previous results can be used, provided the stress fields which are selected nowhere exceed the value of the ratio n/n + 1 of the yield condition for stress.

Crack growth behaviour in biaxial stress fields: Calculation of K-factors for cruciform specimens

2020 ◽  
Vol 107 ◽  
pp. 102521
Author(s):  
Carl H. Wolf ◽  
Andreas Burgold ◽  
Sebastian Henkel ◽  
Meinhard Kuna ◽  
Horst Biermann
Keyword(s):  
Crack Growth ◽  
Biaxial Stress ◽  
Stress Fields ◽  
Growth Behaviour ◽  
Crack Growth Behaviour

THE STUDY OF THE PROCESS OF ROLLING PIPES FROM ANISOTROPIC MATERIAL

2017 ◽  
Vol 21 (4) ◽  
pp. 75-87
Author(s):  
G. M. Zhuravlev ◽  
A. E. Gvozdev ◽  
A. A. Kalinin ◽  
O. V. Kuzovleva ◽  
E. V. Ageev ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Stress State ◽  
Stress Distribution ◽  
Plane Deformation ◽  
Yield Condition ◽  
Biaxial Stress ◽  
Resource Saving ◽  
Cylindrical Anisotropy ◽  
Biaxial Stress State ◽  
Deformation State

The process of rolling pipe with simultaneous significant changes in pipe diameter and thickness is carried out at the mandrel stage. In the region of plastic deformation, biaxial stress and plane deformation state of a pipe take place. The area of biaxial stress state is characterized by the presence of two sections: a section of the sptial bending before the contact with the roll and a section which is in contact with the cylindrical surface of the roll. It is assumed that the material of a tube blank is incompressible, has a cylindrical anisotropy of mechanical properties, is anisotropically hardenable, for which the Mises-Hill yield condition and the associated law of plastic flow are valid. The article considers stress distribution in the areas of biaxial stress state. To take into account the anisotropic hardening of the material information concerning distribution of deformations in the region of plastic deformation was taken into account. The problem of stress distribution in the region of plane deformation state of the region of plastic deformation was considered. It is assumed that radial flow of the material occurs in the region and Coulomb's law of friction is realized at the contact boundaries of the workpiece and the tool. The change in the direction of material flow at the inlet and outlet of the region is taken into account by means of radial stress modification with regard to the discontinuity of the tangential component at the boundary of the deformation region by the work balance method. The expressions obtained for determining deformations and stresses makes it possible to analyze the process of rolling pipes at the mandrel stage taking into account material anisotropy. The obtained results can be used to create resource-saving technologies for processing metallic materials using new nanocomposite lubricants and coatings.

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