Analysis of elastic-plastic strains in shells of revolution under nonaxisymmetric loading

1978 ◽  
Vol 14 (12) ◽  
pp. 1287-1292
Author(s):  
V. I. Berlyand
Keyword(s):  
Plastic Strains ◽  
Shells Of Revolution ◽  
Elastic Plastic ◽  
Nonaxisymmetric Loading

Study of the elastic-plastic state of cyclically loaded shells of revolution

1976 ◽  
Vol 8 (4) ◽  
pp. 483-486
Author(s):  
I. S. Chernyshenko ◽  
G. K. Sharshukov
Keyword(s):  
Plastic State ◽  
Shells Of Revolution ◽  
Elastic Plastic

Elastic-plastic strain distributions at fillet welds

1996 ◽  
Vol 31 (3) ◽  
pp. 215-230 ◽  
Author(s):  
K S Elliott ◽  
H Fessler
Keyword(s):  
Strain Range ◽  
Post Weld Heat Treatment ◽  
Steel Plates ◽  
Plastic Strains ◽  
Weld Toes ◽  
Thick Plates ◽  
Full Size ◽  
Elastic Plastic ◽  
Tensile Forces ◽  
Fringe Patterns

Steel plates 25 mm thick were fillet-welded to 50 mm thick plates according to good offshore welding practice. The thinner plates were inclined at 90° or 60° to the thicker ones to represent, at full size, the crown or saddle positions of a structural tubular T joint. Slices 4 mm or 10 mm thick were cut from these weldments and the elastic, elastic-plastic and residual plastic strains in the surfaces of these sections were measured using photoelastic coatings and moiré interferometry. The slices were loaded by tensile forces on the 25 mm wide parts, reacted at pin joints near the ends of the 50 mm wide part. The positions and directions of loading were arranged to load the welds in the same way as in a tubular T joint, loaded in tension. Yielding initiated at the weld toes and could be clearly identified in the moiré fringe patterns. It progressed into the plates, being inhibited by the heat-affected zone. Maximum plastic strains also occurred at the weld toes. Measurements of residual plastic strains showed that the actual strain range, which ‘drives’ fatigue failure, differs from predictions based on elastic analyses. Post-weld heat treatment is beneficial, but extending the weld along the plate reduces the strain concentrations much more.

Analysis of Elastic-Plastic Shells of Revolution

1970 ◽  
Vol 96 (3) ◽  
pp. 327-340
Author(s):  
Mahmoud Khojasteh-Bakht ◽  
Egor P. Popov
Keyword(s):  
Shells Of Revolution ◽  
Elastic Plastic

A stiffness method for elastic-plastic shells of revolution

1966 ◽  
Vol 1 (4) ◽  
pp. 339-350 ◽  
Author(s):  
P V Marcal ◽  
W R Pilgrim
Keyword(s):  
Pressure Vessel ◽  
Computer Programme ◽  
Shells Of Revolution ◽  
Step Method ◽  
Axisymmetric Loading ◽  
Elastic Plastic ◽  
Stiffness Method ◽  
Experimental Values

A stiffness method is proposed for the analysis of elastic-plastic shells of revolution with axisymmetric loading. A step-by-step method of integration is used in a computer programme developed to implement the method. Calculations were performed for a toroidal bellows and a torispherical pressure vessel head; the results agree with experimental values.

Elastic-plastic behaviour of pipe bends with in-plane bending

1967 ◽  
Vol 2 (1) ◽  
pp. 84-90 ◽  
Author(s):  
P V Marçlal
Keyword(s):  
Experimental Results ◽  
Shells Of Revolution ◽  
Curved Pipe ◽  
Elastic Plastic ◽  
Plastic Behaviour ◽  
Out Of Plane ◽  
Plane Bending

The theory for the in-plane and out-of-plane bending of a curved pipe is reviewed by considering it as an extension of the theory for symmetrically loaded shells of revolution. This treatment is adopted with the intention of modifying an existing elastic-plastic programme for shells of revolution so that it can perform the analysis of pipe bends with in-plane bending. Results are presented for elastic and elastic-plastic behaviour of pipe bends with in-plane bending. These results agree with theoretical and experimental results found in the literature.

Development of a Three-Dimensional Semi-Analytical Elastic-Plastic Contact Code

2002 ◽  
Vol 124 (4) ◽  
pp. 653-667 ◽  
Author(s):  
C. Jacq ◽  
D. Ne´lias ◽  
G. Lormand ◽  
D. Girodin
Keyword(s):  
Three Dimensional ◽  
Indentation Test ◽  
Closed Form Expression ◽  
Reciprocal Theorem ◽  
Plastic Strains ◽  
Surface Geometry ◽  
Fe Method ◽  
Elastic Plastic ◽  
Fine Mesh ◽  
The Reciprocal Theorem

A three-dimensional elastic-plastic contact code based on semi-analytical method is presented and validated. The contact is solved within a Hertz framework. The reciprocal theorem with initial strains is then introduced, to express the surface geometry as a function of contact pressure and plastic strains. The irreversible nature of plasticity leads to an incremental formulation of the elastic-plastic contact problem, and an algorithm to solve this problem is set up. Closed form expression, which give residual stresses and surface displacements from plastic strains, are obtained by integration of the reciprocal theorem. The resolution of the elastic-plastic contact using the finite element (FE) method is discussed, and the semi-analytical code presented in this paper is validated by comparing results with experimental data from the nano-indentation test. Finally, the resolution of the rolling elastic-plastic contact is presented for smooth and dented surfaces and for a vertical or rolling loading. The main advantage of this code over classical FE codes is that the calculation time makes the transient analysis of three-dimensional contact problems affordable, including when a fine mesh is required.

Numerical Simulation and Analysis for 3D Elastic-Plastic Rough Contacts

Tribology ◽  
2006 ◽  
Author(s):  
Fan Wang ◽  
Leon M. Keer ◽  
Q. Jane Wang
Keyword(s):  
Real Contact Area ◽  
Plastic Strains ◽  
Normal Contact ◽  
Elastic Plastic ◽  
Hardening Behavior ◽  
Real Contact ◽  
Residual Displacements ◽  
Surface Deflection ◽  
Plastic Hardening ◽  
Contact Field

A 3D elastic-plastic rough contact (EPC) solution and code is developed using a modified semi-analytical method. The total surface deflection is induced by the contact pressure and plastic strain. A purely elastic contact field and a residual field arising from the plastic deformation are simulated iteratively to gain the final approximate solution for the elastic-plastic rough contact. Frictionless normal contact between a rigid ball and an elastic-plastic half space with polished, turned, and honed rough surfaces was numerically simulated using the developed EPC code. The distributions of surface pressures, real contact area, total stresses, residual stresses, residual displacements, and plastic strains are obtained through simulation. The effects of surface roughness, wavelength, and plastic hardening behavior upon the calculated results are analyzed.

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