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.

Research on Electric Field Simulation of Ring Capacitance Sensor Based on Finite Element Method

2021 ◽  
Vol 105 ◽  
pp. 221-227
Author(s):  
Hui Ling Wang ◽  
Chun Li Cai
Keyword(s):  
Dielectric Constant ◽  
Finite Element ◽  
Electric Field ◽  
Field Intensity ◽  
Electric Field Intensity ◽  
Element Model ◽  
Field Analysis ◽  
Optimal Structure ◽  
Capacitance Sensor ◽  
Finite Element Software

The working principle of ring capacitance sensor is introduced, that is capacitance fringe effect. Finite element model is established through the Hybrid-Trefftz algorithm. Electric field analysis and simulation calculation of different sensor model are done with the finite element software ANSYS, and the optimal structure combination is obtained. And followed the example of optimal structure, the relation of dielectric constant and electric field intensity were given. The result of simulation shows the most direct and the most important two parameters that affect the sensor performance in the design of the ring capacitance sensor are the two electrodes spacing and the length. The dielectric constant of measured medium is smaller, the intensity of electric field intensity is greater. The simulation for subsequent product design has a good theoretical guidance.

Study on Coupling Effect of Hydrogen Pressure Stress Field of Micropores in the Heavy Forgings

2014 ◽  
Vol 884-885 ◽  
pp. 324-328
Author(s):  
Feng Shan Du ◽  
Jie Li ◽  
Jun Kai Fan ◽  
Yuan Li ◽  
Tian Yu Tan
Keyword(s):  
Stress Field ◽  
Relative Position ◽  
Hydrogen Pressure ◽  
Coupling Effect ◽  
Calculation Model ◽  
Field Analysis ◽  
Finite Element Software ◽  
Micro Cracks ◽  
Stress Field Analysis ◽  
Pressure Stress

On the basis of the principle of hydrogen pressure, this paper makes a comprehensive research about coupling effect of the stress field in the micropores in the condition of hydrogen pressure. According to the equation of Kazinczy Pokinger, calculation model of hydrogen pressure strength of the micropores in the heavy forgings is established with the temperature and hydrogen content. Summarize the relative position of crack in the forgings into four combinations, and use the finite element software to analyze the coupling strength of four different combinations of cracks under hydrogen pressure stress field. Analysis results show that, different relative position relationship between cracks and the size of the micro cracks have different effect on coupling effect of hydrogen pressure stress field in micro cracks.

scholarly journals Fatigue Life Prediction of Welded Joint by Microstructure-based Simulation

2019 ◽  
Vol 269 ◽  
pp. 03005
Author(s):  
Takayuki Shiraiwa ◽  
Fabien Briffod ◽  
Manabu Enoki
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Fatigue Life ◽  
Stress Field ◽  
Butt Joint ◽  
Field Analysis ◽  
Computational Techniques ◽  
Stress Field Analysis ◽  
Number Of Cycles ◽  
Element Method

This paper proposes a numerical framework to predict fatigue life on welded joints by integrating several computational techniques. The framework consists of five steps: i) materials properties estimation; ii) welding simulation using thermo-mechanical finite element method; iii) macroscopic stress field analysis under cyclic loading; iv) mesoscopic stress field analysis using crystal plasticity finite element method (CPFEM); v) analysis of fatigue crack growth. The total number of cycles to failure is eventually obtained by the sum of initiation life calculated by CPFEM and propagation life calculated by X-FEM. A fatigue life of butt joint is evaluated by the proposed method. The results demonstrated the possibility of evaluating the fatigue life and its scattering by the proposed framework.

scholarly journals Numerical Simulation of Fatigue Performance of Diaphragm of Large-Span Bridge Orthotropic Deck

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-19
Author(s):  
Hui Li ◽  
Bo Zhao ◽  
Han Zhu
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Fatigue Life ◽  
Finite Element Model ◽  
Element Model ◽  
Life Assessment ◽  
Steel Bridge ◽  
Large Span ◽  
Finite Element Software ◽  
Fatigue Life Assessment

Under traffic loads, orthotropic steel bridge slabs suffer from an obvious fatigue problem. In particular, fatigue cracking of diaphragms seriously affects application and development of orthotropic bridge slabs. In the paper, based on cracking status quo of an orthotropic deck diaphragm of a large-span bridge, experimental tests were formulated to test stress distribution states of the diaphragm. The finite element software ABAQUS was used to establish a finite element model of the orthotropic deck diaphragm; numerical simulation was conducted on the basis of the experiments. Simulation results were compared with experimental results, so correctness of the finite element model was verified. Finally, Local Strain Approach (LSA) and Theory of Critical Distance (TCD) were used to conduct life assessment of the orthotropic deck diaphragms, and applicability of two methods was discussed. In this way, a fatigue life assessment method with high accuracy and good operability was provided for fatigue life assessment of orthotropic deck diaphragms.

Computational Analysis of Laser Cladding of Preset MCrAlY Coating Based on ANSYS Ii-Stress Field

2021 ◽  
Vol 1020 ◽  
pp. 148-156
Author(s):  
Dong Sheng Wang ◽  
Ke Jian Yang ◽  
Hao Yang ◽  
Pei Pei Zhang
Keyword(s):  
Finite Element ◽  
Stress Field ◽  
Finite Element Model ◽  
Laser Cladding ◽  
Computational Analysis ◽  
Element Model ◽  
Thermal Coupling ◽  
Finite Element Software ◽  
Mcraly Coating ◽  
The Finite Element Model

A finite element model of thermal coupling stress field during laser cladding plasma spraying of preset MCrAlY coating was constructed based on the finite element model of temperature field by using the indirect thermal coupling method in ANSYS finite element software. Moreover, stress field during laser cladding was analyzed. Through the constructed model, variation laws of stress field with time during laser cladding and cooling process could be mastered. Based on the stress field, the formation mechanism of cracks in laser cladding coating and influencing factors were further analyzed and some solutions to cracks of laser cladding coating were proposed.

Fatigue Pre-Cracking Curved Wide Plates in Bending

2010 ◽  
Author(s):  
Mark D. Richards ◽  
Timothy S. Weeks ◽  
J. David McColskey ◽  
Bo Wang ◽  
Yong-Yi Wang
Keyword(s):  
Finite Element ◽  
Fatigue Crack ◽  
Stress Intensity ◽  
Fatigue Crack Growth ◽  
Fracture Mechanics ◽  
Stress Field ◽  
Crack Growth ◽  
Field Analysis ◽  
Four Point Bending ◽  
Stress Field Analysis

Curved wide plate (CWP) testing in tension, on API 5L X100 pipes of 36-inch (916-mm) diameter and 0.75-inch (19-mm) wall thickness, has been initiated in support of strain-based design using high strength steel for oil and gas pipeline applications. The CWP tests are being used to optimize and validate welding procedures and to determine the defect tolerance within the girth welds. A traditional pre-requisite for fracture mechanics testing is a final extension of a crack via fatigue pre-cracking to produce a representative flaw. A method of fatigue pre-cracking CWP specimens for final notch preparation in bending was developed to meet ASTM guidelines for fracture mechanics testing. Fatigue pre-cracking for the present specimen geometry was possible in bending due to lower requisite force capacity equipment which allowed for greater cyclic loading frequencies. In order to achieve sufficient stress levels for fatigue crack growth in the curved plate, a stress field analysis was performed to optimize the loading support configuration in four-point bending. In addition to the stress field analysis, a 3-D finite element model of the CWP specimen was generated to analyze the notched CWP specimen in four-point bending. Finite element analysis (FEA) results and experimental data were used to confirm the hypothesis that, under the proposed loading arrangement, the closed-form solutions for stress-intensity (K) of flat plates in bending can be used to approximate the K for CWP specimens in bending. Validation of a solution for stress-intensity factor subsequently allowed the determination of force amplitude levels for fatigue crack growth. Force and crack mouth opening displacement (CMOD) data were analyzed to correlate compliance with crack length measurements. From experimental results, a method was developed that enable the repeatable and well characterized extension of surface flaws by fatigue pre-cracking in curved wide plate specimens in bending.

A pragmatic approach for the evaluation of depth-sensing indentation in the self-similar regime

2021 ◽  
pp. 1-24
Author(s):  
Hamidreza Mahdavi ◽  
Konstantinos Poulios ◽  
Christian F. Niordson
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Depth Sensing ◽  
Finite Element Software ◽  
Element Simulation ◽  
Unique Material ◽  
Reverse Analysis ◽  
Supplementary Material ◽  
Two Parameters ◽  
Force Displacement

Abstract This work evaluates and revisits elements from the depth-sensing indentation literature by means of carefully chosen practical indentation cases, simulated numerically and compared to experiments. The aim is to close a series of debated subjects, which constitute major sources of inaccuracies in the evaluation of depth-sensing indentation data in practice. Firstly, own examples and references from the literature are presented in order to demonstrate how crucial self-similarity detection and blunting distance compensation are, for establishing a rigorous link between experiments and simple sharp-indenter models. Moreover, it is demonstrated, once again, in terms of clear and practical examples, that no more than two parameters are necessary to achieve an excellent match between a sharp indenter finite element simulation and experimental force-displacement data. The clear conclusion is that reverse analysis methods promising to deliver a set of three unique material parameters from depth-sensing indentation cannot be reliable. Lastly, in light of the broad availability of modern finite element software, we also suggest to avoid the rigid indenter approximation, as it is shown to lead to unnecessary inaccuracies. All conclusions from the critical literature review performed lead to a new semi-analytical reverse analysis method, based on available dimensionless functions from the literature and a calibration against case specific finite element simulations. Implementations of the finite element model employed are released as supplementary material, for two major finite element software packages.

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