Relationship of elastic and plastic deformations under volume compression

1993 ◽  
Vol 28 (6) ◽  
pp. 509-514 ◽  
Author(s):  
G. G. Zaretskii-Feoktistov
Keyword(s):  
Plastic Deformations ◽  
Elastic And Plastic Deformations ◽  
Volume Compression ◽  
Relationship Of

Buckling of Columns in the Presence of Creep

1956 ◽  
Vol 7 (2) ◽  
pp. 125-134 ◽  
Author(s):  
Sharad A. Patel
Keyword(s):  
Critical Time ◽  
Secondary Creep ◽  
Plastic Deformations ◽  
Creep Buckling ◽  
Elastic And Plastic Deformations

SummaryThis paper is concerned with the solution of the creep buckling of columns. Instantaneous elastic and plastic deformations, as well as the transient and secondary creep, are considered. Formulae for the critical time at which a column fails are presented for integral values of the exponents appearing in the creep law.

scholarly journals Estimation of the Influence of Compressed Hydrogen on the Mechanical Properties of Pipeline Steels

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6085
Author(s):  
Victor I. Bolobov ◽  
Il’nur U. Latipov ◽  
Gregory G. Popov ◽  
George V. Buslaev ◽  
Yana V. Martynenko
Keyword(s):  
Mechanical Properties ◽  
Stress State ◽  
Pressure Range ◽  
Operating Pressure ◽  
Gas Pipelines ◽  
Plastic Deformations ◽  
Hydrogen Saturation ◽  
Elastic And Plastic Deformations ◽  
Potential Losses ◽  
Pipeline Wall

Consideration of the possibility of transporting compressed hydrogen through existing gas pipelines leads to the need to study the regularities of the effect of hydrogen on the mechanical properties of steels in relation to the conditions of their operation in pipelines (operating pressure range, stress state of the pipe metal, etc.). This article provides an overview of the types of influence of hydrogen on the mechanical properties of steels, including those used for the manufacture of pipelines. The effect of elastic and plastic deformations on the intensity of hydrogen saturation of steels and changes in their strength and plastic deformations is analyzed. An assessment of the potential losses of transported hydrogen through the pipeline wall as a result of diffusion has been made. The main issues that need to be solved for the development of a scientifically grounded conclusion on the possibility of using existing gas pipelines for the transportation of compressed hydrogen are outlined.

Numerical Analysis for Influence of Plastic and Elastic Deformation of Rough Surfaces on PEHL for Line Contacts

Tribology ◽  
2005 ◽  
Author(s):  
R. J. Niu ◽  
P. Huang
Keyword(s):  
Plastic Deformation ◽  
Film Thickness ◽  
Hydrodynamic Lubrication ◽  
Paper Analysis ◽  
Line Contact ◽  
Plastic Deformations ◽  
Rolling Contacts ◽  
Line Contacts ◽  
Elastic And Plastic Deformations ◽  
Strain Relationship

In the present paper, analysis of elasto-plasto-hydrodynamic lubrication (PEHL) in the line contact is carried out to investigate the effect of heavily loaded roll-over on the change in profile of indents. The pressure and film thickness profiles are obtained to solve the Reynolds and film thickness equations simultaneously. And, both the elastic and plastic deformations of the contact, featured with an indent, have been considered. A multi-grid numerical algorithm used in EHL of line contacts is modified and then used for the oil lubricated rolling contacts. In the program, stress and plastic deformation of the indent profile are calculated with the hardening plastic stress-strain relationship according to the theories of plasticity when pressure excesses the yield stress. The results, with and without considering plastic deformation, are compared to show the different influences on the pressure and film thickness. Analysis shows that since the plastic deformation will change the surface roughness, it will significantly change the pressure but film thickness.

Elastic and plastic deformations of nickel nanowires under uniaxial compression

2005 ◽  
Vol 30 (1-2) ◽  
pp. 45-50 ◽  
Author(s):  
Baolin Wang ◽  
Daning Shi ◽  
Jianming Jia ◽  
Guanghou Wang ◽  
Xiaoshuang Chen ◽  
...  
Keyword(s):  
Uniaxial Compression ◽  
Plastic Deformations ◽  
Nickel Nanowires ◽  
Elastic And Plastic Deformations

A mechanical model of creep of polycrystalline ice

1978 ◽  
Vol 15 (2) ◽  
pp. 155-170 ◽  
Author(s):  
Bernard Michel
Keyword(s):  
Experimental Data ◽  
Mechanical Model ◽  
Mathematical Expression ◽  
Two Dimensional ◽  
Elastic Deformations ◽  
Plastic Deformations ◽  
Creep Curves ◽  
Different Types ◽  
Polycrystalline Ice ◽  
Elastic And Plastic Deformations

The paper presents a two dimensional mechanical model for the deformation and creep of polycrystalline ice that takes into account the elastic and plastic deformations of each crystal.The model applies to many cases of creep so that the different types of creep curves have been defined during the transitory, permanent and accelerated phases and the corresponding creep laws have been derived. The mechanics of cracking are not analyzed in this paper.The expression for the plastic deformation in this model is based on the principle of multiplication of mobile dislocations and Glen's law for permanent creep. The corresponding mathematical expression for creep without cracking, called α creep, is shown to represent, at the lower limit, the flow of glaciers and is shown to verify a large variety of measured creep curves either in monocrystals or in polycrystalline ice.The elastic deformations in this model bring to light the important role played by delayed elasticity, which is shown by experimental data but has never been elucidated previously.

Sign in / Sign up

Export Citation Format

Share Document