Life Prediction Feasibility in TMF via Stress/Strain Data From a Viscoplasticity-Based Numerical Model

2012 ◽  
Author(s):  
Justin Karl ◽  
Ali P. Gordon
Keyword(s):  
Life Prediction ◽  
Mechanical Load ◽  
Experimental Testing ◽  
Stress And Strain ◽  
Single Element ◽  
Load History ◽  
Analysis Software ◽  
Element Analysis ◽  
Strain Data ◽  
Temperature Strain

Contemporary computing packages handle a wide variety of stress analysis types, but are yet to provide an optimal way to handle certain load cases and geometries. Blades in gas turbine systems, for instance, undergo repetitive thermal and mechanical load cycles of varied shape and phasing. Complexly-shaped airfoils create non-uniform stress paths that exacerbate the problem of FEA software attempting to determine the correct states of stress and strain at any point during the load history. This research chronicles the update and integration of Miller’s original viscoplasticity model with ANSYS finite element analysis software. Elevated temperature strain-controlled LCF and strain-controlled TMF loadings were applied to single-element, uniaxial simulation runs and the results were then compared to data from duplicate experimental testing. Initial findings indicate that the model maintains significant accuracy through several cycles, but longer tests produce varying error in hysteretic response. A review of the modernized implementation of Miller’s viscoplasticity model is presented with a focus on modifications that may be used to improve future results.

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.

Finite Element Analysis on Stress and Strain of Protected Fiber Bragg Grating

2010 ◽  
Vol 148-149 ◽  
pp. 1639-1642
Author(s):  
Jian Feng Xie
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Theoretical Analysis ◽  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Stress And Strain ◽  
Analysis Software ◽  
Element Analysis ◽  
Varied Temperature

The stresses and strains on the protected FBG and protected layer under varied temperature were analyzed in theory. In order to verify the theoretical analysis of stress and strain,a finite element analysis software(ANSYS) was used to simulate the stresses and strains on the protected FBG and protected layer. Both simulation and theoretical analysis are show that the strain and stress on protected layer in r direction decreases with the increasing of radius(r), while the strain and stress in direction increases with the increasing of radius(r) . The results of theoretical analysis matches the ones form simulations well.

The Simulation of Rolling Process of Wire with Y-Type Roller

2014 ◽  
Vol 602-605 ◽  
pp. 709-712
Author(s):  
Jin Hong Ma ◽  
Bin Tao ◽  
Xiao Han Yao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Rolling Mill ◽  
Three Dimensional ◽  
Rolling Process ◽  
Stress And Strain ◽  
Analysis Software ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Three Dimensional Models

Y-Type rolling mill with three roller is a new kind of wire mill.The three-dimensional models of rolling are established by Pro/E. Based on the finite element analysis software ANSYS/LS-DYNA, the rolling process of wire by Y-type rollers is simulated. The rolling piece movement is analysed. Stress and strain of Y-type roller are also analysed.

Finite Element Analysis on Stress and Strain of Embedded Fiber Bragg Grating

2010 ◽  
Vol 148-149 ◽  
pp. 1634-1638
Author(s):  
Jian Feng Xie
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Theoretical Analysis ◽  
Fiber Bragg Grating ◽  
Cement Mortar ◽  
Bragg Grating ◽  
Stress And Strain ◽  
Analysis Software ◽  
Element Analysis ◽  
Varied Temperature

After FBG was protected and embedded into cement mortar, the stresses and strains on the FBG ,protected layer and cement mortar under varied temperature were analyzed in theory. In order to verify the theoretical analysis of stress and strain,a finite element analysis software(ANSYS)was used to simulate the stresses and strains on the FBG ,protected layer and cement mortar. The results of theoretical analysis matches the ones form simulations well.

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

2012 ◽  
Vol 164 ◽  
pp. 317-321
Author(s):  
Zhi Cheng Huang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Pressure ◽  
Stress And Strain ◽  
Cad Model ◽  
Analysis Software ◽  
Element Analysis ◽  
Horizontal Type ◽  
Pressure Grouting ◽  
Object Of Study

In order to study the stress and strain of front and back mould plates of high pressure grouting machine, this paper took a type of ceramics for daily use horizontal type high pressure grouting machine as the object of study. Established its CAD model and analysed it with finite element analysis software. The analysis results can provide a reference for design, and have some engineering and practical value.

Fatigue Life Analysis of Large-Scale Liner Vibration Screener Based on ANSYS

2010 ◽  
Vol 37-38 ◽  
pp. 466-470 ◽  
Author(s):  
Yong Yan Wang ◽  
Xin Hua Fu ◽  
Tian Tong Guo ◽  
Li Chen ◽  
Hui Qing Mao
Keyword(s):  
Fatigue Life ◽  
Working Conditions ◽  
Theoretical Basis ◽  
Life Prediction ◽  
Large Scale ◽  
Local Stress ◽  
Analysis Software ◽  
Element Analysis ◽  
Life Analysis ◽  
Fatigue Life Analysis

Based on the theory of fatigue life prediction and by using the local stress-strain method and the material S-N curve of Q235 deduced by empirical formula; the fatigue was analyzed for the key parts of large-scale liner vibration screener by means of the general finite element analysis software, ANSYS. Thereby, the working conditions of force bearing, reliability and fatigue life-span of the key parts can be judged. The study will provide a theoretical basis for the design , manufacture, and installation of the large-scale liner vibration screener.

Lightweight Design of the Truck Side Framework

2012 ◽  
Vol 236-237 ◽  
pp. 209-212
Author(s):  
Jun Li ◽  
Ying Xiang Teng
Keyword(s):  
Finite Element ◽  
Lightweight Design ◽  
Equivalent Stress ◽  
Side Wall ◽  
Stress And Strain ◽  
State Variables ◽  
The Finite Element Method ◽  
Analysis Software ◽  
Element Analysis ◽  
Design Variables

For the vehicle, lightweight means low fuel consumption. and small quantity of exhausted gas. In this paper by using the finite element method, the author established the model of the truck side framework. After meshing, exerting constraint, loading and calculating through finite element analysis software,the author obtained the deformation of the component. By researching changes of the stress and strain in X, Y, Z three directions of the component,the author obtained chart of the stress and strain. By using the method of arithmetic, the author defined the internal dimension as design variables, the equivalent stress and the deformation as the state variables, and quality as the objective function to get the lightest side wall frame of the vehicle on the premise of warranty of the intensity and stiffness.From the result, we can see the framework after optimal design is still very strong to resist the stress and the deformation.

Thermo-Mechanical Coupling Analysis of Tubular C/C-Weaving Composite

2014 ◽  
Vol 494-495 ◽  
pp. 538-545
Author(s):  
Feng Qu ◽  
Dong Po Qu
Keyword(s):  
Temperature Stability ◽  
Stress And Strain ◽  
Analysis Software ◽  
Coupling Analysis ◽  
Element Analysis ◽  
Temperature Changes ◽  
Mechanical Coupling ◽  
The Finite Element Analysis ◽  
Sequential Coupling ◽  
Temperature And Pressure

For the tubular C/C-weaving composite is often loaded on thermotics and mechanics loads together in using, adopting the sequential coupling method, utilizing the finite element analysis software: firstly analyze the stress distribution on loading temperature and pressure loads together, the maximums and changing rules of displacement, stress and strain have been obtained. Based on the works above, further to analyze the thermo-mechanical coupling of different loads, the curves of displacement, stress and strain in the specified paths have been obtained, it shows that the influence from temperature on every parameters is little when loading on the larger loads. So come to the conclusion that the tubular C/C composite has good temperature stability and can be used in the condition of high temperature or temperature changes greatly.

scholarly journals Fatigue Life Prediction of Steam Generator Tubes by Tube Specimens with Circular Holes

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 322 ◽  
Author(s):  
Qiwei Wang ◽  
Junfeng Chen ◽  
Xiao Chen ◽  
Zengliang Gao ◽  
Yuebing Li
Keyword(s):  
Finite Element Analysis ◽  
Fatigue Life ◽  
Life Prediction ◽  
Local Stress ◽  
Fatigue Life Prediction ◽  
Stress And Strain ◽  
Element Analysis ◽  
Transfer Tube ◽  
Inconel 690 ◽  
Circular Holes

Heat exchangers manufactured from Inconel 690 tubes are widely used for steam generators in nuclear power plants. Inconel 690 tubes have suffered failures of fatigue fracture due to flow induced vibration. It is difficult to obtain the fatigue life of the tube directly since the conventional fatigue test would potentially cause end fatigue failure due to the stress concentration at the clamp end. In this study, a thin-walled Inconel 690 tube with circular hole is designed to deduce the fatigue life of smooth tube based on the notch fatigue life prediction technology. Firstly, the local stress and strain distributions around the hole based on the finite element analysis are discussed. Local stress-strain is calculated and compared with Neuber’s ruler. Meanwhile, fatigue life tests using tube specimens with circular holes are carried out. Finally, based on the best-fitted fatigue life curve of Inconel 690 alloy, the fatigue life of tube specimen is estimated from the local strain according to Neuber’s ruler. The results show that the local stress and strain estimated by Neuber’s ruler are basically consistent with those obtained by finite element analysis. Compared with the average fatigue life of nickel-based alloy, the new predicted equivalent fatigue life of heat Inconel 690 transfer tube with a hole is higher. The Inconel 690 heat transfer tube has better fatigue performance.

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