Advances in local mechanoelectrochemistry for detecting pitting corrosion in duplex steels

2004 ◽  
Vol 19 (12) ◽  
pp. 3688-3694 ◽  
Author(s):  
N. Mary ◽  
V. Vignal ◽  
R. Oltra ◽  
L. Coudreuse
Keyword(s):  
Finite Element ◽  
Stress Field ◽  
Pitting Corrosion ◽  
Surface Stress ◽  
Finite Element Code ◽  
Thermomechanical Model ◽  
Residual Surface Stress ◽  
Corrosion Tests ◽  
Microcell Technique ◽  
Duplex Steels

The goal of this study was to demonstrate that a relationship exists between surface stress and pitting corrosion. The surface stress field generated by polishing was first calculated using a thermomechanical model and a finite element code. Pitting corrosion tests performed at the microscale along the austenite/ferrite interface using the electrochemical microcell technique were then analyzed considering the microstructure, and the residual surface stress field calculated numerically under the microcapillary. Mechanical criteria are proposed leading to an enhancement of pitting corrosion of duplex steels.

scholarly journals A finite element–based numerical tool for Ni47Ti44Nb9 SMA structures design: Application to tightening rings

2011 ◽  
Vol 23 (2) ◽  
pp. 141-153 ◽  
Author(s):  
B Piotrowski ◽  
T Ben Zineb ◽  
E Patoor ◽  
A Eberhardt
Keyword(s):  
Finite Element ◽  
Shape Memory Alloy ◽  
Finite Element Code ◽  
Test Bed ◽  
Thermomechanical Model ◽  
Specific Behavior ◽  
Numerical Predictions ◽  
Numerical Tool ◽  
Geometrical Defects ◽  
Validation Strategy

This paper deals with the design of Ni47Ti44Nb9 shape memory alloy (SMA) tightening components. The tightening of an SMA ring on an elastic pipe is analyzed using the finite element code ABAQUS® and a UMAT subroutine developed by the authors to model the specific behavior of Ni47Ti44Nb9 SMA. Main features of the thermomechanical model implemented in this UMAT routine are briefly recalled. Numerical predictions are validated using experimental tightening pressures obtained on a test bed developed in this work. The validation strategy is documented and the results for different ring thicknesses are presented. This finite element tool is then applied to a parametric study of the influence of ridges on the tightening pressure. Eventually, geometrical defects like out of roundness are considered.

scholarly journals On the Structural Behavior of Progressively Mined Solution Cavities in Salt

1977 ◽  
Vol 44 (4) ◽  
pp. 565-570 ◽  
Author(s):  
A. F. Fossum
Keyword(s):  
Finite Element ◽  
Stress Field ◽  
Rock Salt ◽  
Tectonic Stress ◽  
Analysis Procedure ◽  
Time Dependent ◽  
Structural Behavior ◽  
Tectonic Stress Field ◽  
Finite Element Code ◽  
Excavation Process

The stress field and the time dependent deformation around a solution cavity in rock salt are shown to be sensitive to the details of the excavation process and to the prevailing tectonic stress field. An analysis procedure is developed whereby an incremental excavation procedure and a creep routine are incorporated simultaneously into an axisymmetric finite element code.

Finite Element Analysis of Surface Residual Stress in Functionally Gradient Cemented Carbide Tool

2018 ◽  
Vol 37 (3) ◽  
pp. 233-243 ◽  
Author(s):  
Chuangnan Su ◽  
Deshun Liu ◽  
Siwen Tang ◽  
Pengnan Li ◽  
Xinyi Qiu
Keyword(s):  
Finite Element ◽  
Layer Thickness ◽  
Surface Stress ◽  
Cemented Carbide ◽  
Distribution Model ◽  
Elemental Distribution ◽  
Geometrical Shape ◽  
Residual Surface Stress ◽  
Gradient Layer ◽  
Functionally Gradient

AbstractA component distribution model is proposed for three-component functionally gradient cemented carbide (FGCC) based on electron probe microanalysis results obtained for gradient layer thickness, microstructure, and elemental distribution. The residual surface stress of FGCC-T5 tools occurring during the fabrication process is analyzed using an ANSYS-implemented finite element method (FEM) and X-ray diffraction. A comparison of the experimental and calculated values verifies the feasibility of using FEM to analyze the residual surface stress in FGCC-T5 tools. The effects of the distribution index, geometrical shape, substrate thickness, gradient layer thickness, and position of the cobalt-rich layer on residual surface stress are studied in detail.

Rubber Covered Rolls—The Nonlinear Elastic Problem

1980 ◽  
Vol 47 (1) ◽  
pp. 82-86 ◽  
Author(s):  
R. C. Batra
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Contact Surface ◽  
Surface Stress ◽  
Pressure Profile ◽  
Elastic Problem ◽  
Geometrically Nonlinear ◽  
Finite Element Code ◽  
Rigid Cylinder ◽  
Nonlinear Elastic

The problem of the indentation of a rubberlike layer bonded to a rigid cylinder and indented by another rigid cylinder is analyzed. The rubberlike layer is assumed to be made of a homogeneous Mooney-Rivlin material. The materially and geometrically nonlinear problem is solved by using the finite-element code developed by the author. Results computed and presented graphically include the pressure profile at the contact surface, stress distribution at the bond surface and the deformed shape of the indented surface.

Design of object oriented finite element code

2001 ◽  
Vol 32 (10-11) ◽  
pp. 759-767 ◽  
Author(s):  
B Patzák ◽  
Z Bittnar
Keyword(s):  
Finite Element ◽  
Object Oriented ◽  
Finite Element Code
Sign in / Sign up

Export Citation Format

Share Document