Stress and strain gradients in high-pressure tube twisting

2012 ◽  
Vol 66 (10) ◽  
pp. 773-776 ◽  
Author(s):  
A. Pougis ◽  
L.S. Tóth ◽  
O. Bouaziz ◽  
J-J. Fundenberger ◽  
D. Barbier ◽  
...  
Keyword(s):  
High Pressure ◽  
Pressure Tube ◽  
Stress And Strain ◽  
Strain Gradients

Deformation cubic anvil press and stress and strain measurements using monochromatic X-rays at high pressure and high temperature

2011 ◽  
Vol 31 (3) ◽  
pp. 399-406 ◽  
Author(s):  
Rei Shiraishi ◽  
Eiji Ohtani ◽  
Tomoaki Kubo ◽  
Naoko Doi ◽  
Akio Suzuki ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Stress And Strain ◽  
X Rays ◽  
Strain Measurements

CAD/CAE on the Mould Plates of Vertical Type High-Pressure Grouting Machine

2012 ◽  
Vol 538-541 ◽  
pp. 2681-2684
Author(s):  
Zhi Cheng Huang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Pressure ◽  
3D Model ◽  
Stress And Strain ◽  
Analysis Software ◽  
Element Analysis ◽  
Pressure Grouting ◽  
Object Of Study

Took a type of ceramics for daily use vertical type high pressure grouting machine as the object of study, study the stress and strain of its upper and lower mould plates. Established their 3D model by CAD software Pro-E, and then import them into finite element analysis software to analysis the value and distribution of the stress and strain. The analysis results can provide some reference for design, and have some engineering and practical value.

Vibration resistant high pressure tube fitting

1987 ◽  
Vol 81 (2) ◽  
pp. 581-581
Author(s):  
Leonard J. Kowal ◽  
Albert J. Schwarz
Keyword(s):  
High Pressure ◽  
Pressure Tube

A Stress and Strain Analytical Formula Applied in Low Alloy and High Strengthen Steel Material

2011 ◽  
Vol 213 ◽  
pp. 241-245
Author(s):  
Hong Wang ◽  
Yu Xian Zhang ◽  
Qing Xia Lin ◽  
Qing Hua Zhou
Keyword(s):  
Residual Stress ◽  
High Pressure ◽  
Pressure Vessel ◽  
Analytical Formula ◽  
Stress And Strain ◽  
High Pressure Vessel ◽  
Steel Material

In order to study the residual stress of the auto-frettagea super high pressure vessel effectively, a new stress and strain analytical formula is brought forward. It indicates that this analytical formula is more accurate under actual conditions for the steel applied in auto-frettagea super high pressure vessel through strict mathematical testimony. Subsequently, it describes how to establish this analytical formula and analyzes the analytical formula’s error through taking some material as an example. It illustrates that it is feasible and reliable to solve this new analytical formula basing on general tensile curves through this instance. The analytical formula is also of theoretical signification and engineering practical value in application.

Non-Local Cyclic Life Prediction for Gas Turbine Components With Sharply Notched Geometries

2007 ◽  
Author(s):  
Roland Mu¨cke ◽  
Holger Kiewel
Keyword(s):  
Test Data ◽  
Gas Turbines ◽  
Life Prediction ◽  
Stress And Strain ◽  
Rotor Steel ◽  
Cyclic Life ◽  
Stress Strain ◽  
Efficient Operation ◽  
Strain Gradients ◽  
Non Local

The safe and efficient operation of modern heavy duty gas turbines requires a reliable prediction of fatigue behaviour of turbine components. Fatigue damage is located in areas where cyclic stress and strain amplitudes are highest. Thus, geometrical notches associated with stress/strain concentrations and stress/strain gradients appear to be the most important sites for fatigue crack initiation. The paper addresses a non-local concept for fatigue life prediction of notched components. In contrary to various local approaches in the field, the proposed method explicitly accounts for stress and strain gradients associated with notches, cooling holes, fillets and other design features with stress raising effect. As a result, empirical analytical expressions for considering either strain or stress gradients on cyclic life prediction are obtained. The method has been developed from cyclic test data on smooth and notched specimens made of a ferritic 1.5CrNiMo rotor steel. The obtained analytical formulations have then been applied to test data on the Nickel base superalloy MAR-M247 CC showing a good agreement between prediction and measurement. Moreover, the proposed non-local lifing concept has been validated by component tests on turbine blade firtrees. The predicted cycles to failure correlates well to the experimental results showing the applicability of the proposed method to complex engineering designs.

scholarly journals Studies on the Residual Stress and Strain Gradients in Poly-SiGe Nanocantilevers

2019 ◽  
Vol 4 (1) ◽  
Author(s):  
Tesleem B Asafa
Keyword(s):  
Strain Gradient ◽  
Stress Gradient ◽  
Local Stress ◽  
Stress And Strain ◽  
Fast Method ◽  
Stress Evolution ◽  
Strain Gradients ◽  
Study Results ◽  
Evolution Study ◽  
Gradient Measurement

One of the fundamental structural requirements for Micro/Nano-ElectroMechanical (M/NEM) devices is low strain gradient. Measurement of strain gradients is time consuming, therefore finding a simple and fast method is necessary. In this paper, a comparative study of the strain gradients in poly-SiGe nanocantilevers measured experimentally and obtained using finite element modelling (FEM) approach is reported.  Arrays of nanocantilevers were fabricated from 100 nm thick poly-SiGe films via lithography. Then, strain gradients were calculated from the tip deflections and cantilevers’ lengths. In the modelling study, similar cantilevers were modelled with COMSOL Multiphysics as superposition of smaller layers in which each layer sustained local stress obtained from stress evolution study. Results showed that the average strain gradients obtained from the experimental and FEM studies differ by ~5% and ~6% for film A and B, respectively with standard deviations lying between ±0.004 and ±0.009/µm. While this study established that stress gradient is responsible for the calculated strain gradient, it also emphasises that both parameters are proportional. Key words: Poly-SiGe, Strain gradient, FEM, COMSOL.

Analysis and Calculation of the Art of Internal High Pressure Forming

2013 ◽  
Vol 746 ◽  
pp. 374-379
Author(s):  
Ying Liu ◽  
Feng Xu ◽  
Bing De Wang
Keyword(s):  
High Pressure ◽  
Wall Thickness ◽  
New Technology ◽  
Elastic Force ◽  
Stress And Strain ◽  
Hydraulic Pressure ◽  
Forming Process ◽  
Incompressibility Condition ◽  
Theoretical Support ◽  
Light Components

nternal high pressure forming is a new technology producing hollow light components. Due to the process of internal high pressure forming is very complicated with many factors, the dissertation will focus on the use of plastic-elastic force theory to acquire the hydraulic pressure needed and the tubes wall thickness in the final forming fillet. Based on the assumption of volume's incompressibility condition, we analyze and calculate the stress and strain of the tubes wall. Finally we estimate the formula of the hydraulic pressure needed in the forming process. The whole work can offer a concise formula to engineer in the infancy of designing. And it also is the great theoretical support to the development of the internal high pressure forming.

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