3D Back Analysis of Initial Stress Field Based on Neural Network RBF Model

2011 ◽  
Vol 243-249 ◽  
pp. 3223-3228
Author(s):  
Zhong Fu Wang ◽  
Han Dong Liu ◽  
Tong Jiang ◽  
Si Wei Wan
Keyword(s):  
Finite Element ◽  
Stress Field ◽  
Initial Stress ◽  
Linear Regression Analysis ◽  
Back Analysis ◽  
Element Model ◽  
Training Sample ◽  
Geological Condition ◽  
Initial Stress Field ◽  
Factory Building

Based on geological condition of underground factory building in Hohhot pumped storage power station, research and analysis are taken for the fundamental element which affect initial stress field, 3D finite element model of underground factory building is build for the analysis. Beigin with regrssion analysis, adopt linear elasticity caculation of finite element method to take linear regression analysis, and obtain range of optimized parameters. Adopt homogeneous design to definite various assemblies of optimized parameters at different levels. Obtain training sample by elasto plastic caculation of finite element, train for RBF model in oder to get inverse model of ground stress field. The calculation result shown that: RBF model overcome the disadvantages such as slow calculating speed and overfitting of BP model, and it could obtain distrubution rule of initial stress filed by inverse analysis in a reasonable way.

A Fundamental Study of the Interaction of Residual Stress and Applied Loading on Fracture

2010 ◽  
Author(s):  
C. J. Aird ◽  
M. J. Pavier ◽  
D. J. Smith
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Stress Field ◽  
Crack Closure ◽  
Applied Load ◽  
Element Model ◽  
Residual Stress Field ◽  
Fundamental Study ◽  
Analytical Expression ◽  
Applied Loading

This paper presents the results of a fundamental finite-element based study of the crack-closure effects associated with combined residual and applied loading. First, an analytical expression for a representative two-dimensional residual stress field is derived. This residual stress field contains a central compressive region surrounded by an equilibrating tensile region. The analytical expression allows the size and shape of the field to be varied along with the magnitude of the residual stress. The residual stress field is then used as a prescribed initial stress field in a finite element model, in addition to a far field applied load. By introducing cracks of increasing length into these models, charts of stress-intensity-factor versus crack length are produced for different relative magnitudes of residual stress and applied load and for different sizes and shape of the residual stress field. These charts provide insight into the way in which crack-tip conditions evolve with crack growth under conditions of combined residual and applied loading and also enable conditions of crack closure and partial closure to be identified.

Modeling and Simulation of High Speed Intermittent Cutting Based on the Finite Element Method

2013 ◽  
Vol 683 ◽  
pp. 556-559
Author(s):  
Bin Bin Jiao ◽  
Fu Sheng Yu ◽  
Yun Jiang Li ◽  
Rong Lu Zhang ◽  
Gui Lin Du ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Field ◽  
Cutting Force ◽  
High Speed ◽  
Element Model ◽  
Periodic Variation ◽  
Element Analysis ◽  
Intermittent Cutting ◽  
Element Method

In order to study the distribution of the stress field in the high-speed intermittent cutting process, finite element model of high-speed intermittent cutting is established. Exponential material model of the constitutive equation and adaptive grid technology are applied in the finite element analysis software AdvantEdge. The material processing is simulated under certain cutting conditions with FEM ( Finite Element Method ) and the distribution of cutting force, stress field, and temperature field are received. A periodic variation to the cutting force and temperature is showed in the simulation of high-speed intermittent cutting. Highest value of the milling temperature appears in front contacting area of the knife -the chip.and maximum stress occurs at the tip of tool or the vicinity of the main cutting edge. The analysis of stress and strain fields in-depth is of great significance to improve tool design and durability of tool.

A finite element model of the stress field in a star-shaped inclusion

1995 ◽  
Vol 3 (4) ◽  
pp. 423-429 ◽  
Author(s):  
Jürgen Wulf ◽  
Pete Lipetzky ◽  
Glenn E. Beltz ◽  
Thorsten Steinkopff
Keyword(s):  
Finite Element ◽  
Stress Field ◽  
Finite Element Model ◽  
Element Model ◽  
Shaped Inclusion

Temperature Stress Field Distribution Study of Asphalt Carrier’S Based on Rockwool Damaged

2011 ◽  
Vol 189-193 ◽  
pp. 2005-2008
Author(s):  
Yong He Xie ◽  
Wei Wang ◽  
Gang Qiang Li
Keyword(s):  
Finite Element ◽  
Stress Field ◽  
Temperature Stress ◽  
Field Distribution ◽  
Material Properties ◽  
Element Model ◽  
Distribution Study ◽  
Hull Structure ◽  
Insulation Performance ◽  
The Finite Element Model

The rockwool has excellent thermal insulation performance, makes the hull structure and high-temperature asphalt effective isolation. But asphalt carrier’s temperature stress field distribution will be impacted once the rockwool damaged, so the rockwool damage factors are interested. The finite element model of cargo hold and rockwool are created in the present paper, the temperature stress field distribution is concerned with different boundary conditions and material properties.

The Influence of Residual Stress on the Machining Deformation

2012 ◽  
Vol 426 ◽  
pp. 172-176
Author(s):  
Hun Guo
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Finite Element Model ◽  
Simulation Model ◽  
Elasticity Theory ◽  
Initial Stress ◽  
Fem Simulation ◽  
Element Model ◽  
Fem Model ◽  
Simulation Results

The key problems in 2D FEM simulation such as the establishment of finite element model, the initial stress loading, the distortion appraisal are solved and 2D FEM simulation model is built to analyze the milling distortion caused by the residual stress. The FEM model is verified by the elasticity theory. Some machining cases are simulated by using of the FEM model. The machining distortion caused by residual stress are analyzed and summarized using the simulation results.

The Stress Calculating and Analysis of the Second HP Turbine Disc of a Certain Type of Aeroengine

2013 ◽  
Vol 331 ◽  
pp. 176-180
Author(s):  
Ke Jun Xu ◽  
Yong Qi Wang ◽  
Yi Rui Xia ◽  
Ming Ming Jia
Keyword(s):  
Finite Element ◽  
Stress Field ◽  
Element Model ◽  
Life Assessment ◽  
Field Analysis ◽  
Finite Element Software ◽  
Turbine Disc ◽  
Stress Field Analysis ◽  
Numerical Calculation Method ◽  
Element Theory

This paper takes the 2nd HP turbine disc of an aeroengine as research object, construct its finite element model in software-Patran. According to the work environment of 2nd HP turbine disc, the boundary conditions of stress field analysis and temperature field analysis are confirmed. Based on the finite element theory of thermal analysis and structure analysis, we use finite element software-Nastran to analyze centrifugal stress and thermal stress. Numerical calculation method was used to fit the data and finally we got the thermal elastic stress field. According to the computed results, the life assessment points of disc were confirmed. The static strength of 2nd HP turbine disc was tested based on the EGD-3 criterion. All the work established the foundation for subsequent life analysis.

The Damage Finite Element Analysis of Eutectic Composite Ceramic Containing Lamellae

2011 ◽  
Vol 121-126 ◽  
pp. 473-477
Author(s):  
Shu Qin Zhang ◽  
Xin Hua Ni ◽  
Xie Quan Liu ◽  
Ying Chen Ma
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Field ◽  
Composite Ceramic ◽  
Element Model ◽  
Eutectic Composite ◽  
Element Analysis ◽  
Matrix Fracture ◽  
Damage Process ◽  
The Finite Element Model

According to microstructures in eutectic composite ceramic, the finite element model of composite with eutectic interphase is established. The mechanical stress field of eutectic composite ceramic containing lamellae is simulated. APDL programming in ANSYS is used to analyze the damage process of eutectic composite ceramic. Results show that the failure of eutectic composite ceramic is determined by the damage of matrix. As load is increasing, the damage will elongate along the interphase and extend to the internal of matrix. At last the damage arouses matrix fracture.

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