Finite Element Analysis of Stress Concentration at Rounded Crack Tip with Different Physical Parameters

2013 ◽  
Vol 481 ◽  
pp. 230-234 ◽  
Author(s):  
Meng Kao Yeh ◽  
Chien Ming Kao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Concentration ◽  
Crack Tip ◽  
Physical Parameters ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Element Type ◽  
Simulation Results ◽  
Element Shape

This paper investigates the effect of physical parameters of a rounded crack on the stress concentration near crack tip. The depth and radius at the crack tip are the two physical parameters concerned in this study. The finite element method was used to evaluate the stress value at the crack tip for a silicon chip with a tiny crack under tensile stress. Element type, shape and physical parameters of crack were varied to study their effect on the stress concentration near the crack. The simulation results were compared with the theoretical value, and the better physical parameters as well as the element type, element shape were discussed.

scholarly journals Changes in the stiffness of load-bearing elements of a high-rise building and inclinometer data based on finite element analysis

2021 ◽  
Vol 263 ◽  
pp. 02023
Author(s):  
Alexey Plotnikov ◽  
Mikhail Ivanov
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Automatic Monitoring ◽  
Physical Parameters ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Reinforcing Bar ◽  
High Rise ◽  
Element Method

The use of monitoring techniques during the operation of a building contributes to the study of the stress-strain state of both known and newly developed structural systems. The article discusses the effect of reducing the bending stiffness of reinforced concrete crossbars of high-rise buildings on the overall deformability, which can be monitored by changing the angles of rotation at characteristic points. For the introduction into the model of the calculation based on finite elements of the physical parameters of the stiffness of reinforced concrete bending elements, the function of the change in the shoulder of a pair of forces in the section during the opening of normal cracks is given. Empirical data on changes in the stress unevenness coefficient along the length of the reinforcing bar are used. The calculation is based on the diagrammatic method. The data on the accumulated experience of measuring the angles of rotation of a building with automatic monitoring of buildings are presented. Using the finite element method, the systems were simulated with a decrease in stiffness to 0.4 from the initial one. It is shown that it is possible to select a range of sensors - angle meters - inclinometers. It has been determined that the angle of rotation can be changed up to 1.6 times. The corresponding ranges are defined for two types of frameworks: frame and frame-braced. The nature of the change in the overall stiffness of the building frame as a result of reducing the stiffness of the crossbars is shown. Calculation models based on the finite element method determined the deformation limits of the entire frame as a whole.

Why Is (111) Silicon a Better Mechanical Material for MEMS: Torsion Case

2003 ◽  
Author(s):  
Donghun Kwak ◽  
Jongpal Kim ◽  
Sangjun Park ◽  
Hyoungho Ko ◽  
Dong-Il Cho
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cross Section ◽  
Rectangular Cross Section ◽  
Silicon Wafers ◽  
Torsional Stiffness ◽  
Rotational Inertia ◽  
The Finite Element Method ◽  
Element Type ◽  
Simulation Results

This paper shows that using the Finite Element Method (FEM), the torsional stiffness of silicon varies by the least amount on silicon (111) with respect to crystallographic directions, when compared to silicon (100) and (110). The used simulator is ANSYS 5.7 with the element type of Solid 64. As a simulation model, we use a simple torsion system, in which a rotational inertia is attached to the center of clamped-clamped beam with a rectangular cross-section. From the results of the modal analysis, the torsional stiffness is derived using the formula between the natural frequency and the torsional stiffness. Simulation results show that the maximum variations of the torsional stiffness on silicon (111), (100) and (110) are 2.3%, 26.5%, and 31.2%, respectively. This implies that on <100> and <110> silicon wafers, substantially different physical dimensions are necessary for devices with the same torsional characteristics, but with different orientations. Therefore, <111> silicon wafers represent a more suitable substrate to design and fabricate torsional micro and nano systems.

scholarly journals Augmented Reality Visualization of Modal Analysis Using the Finite Element Method

2021 ◽  
Vol 11 (3) ◽  
pp. 1310
Author(s):  
Merve Yavuz Erkek ◽  
Selim Erkek ◽  
Elmira Jamei ◽  
Mehdi Seyedmahmoudian ◽  
Alex Stojcevski ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Augmented Reality ◽  
Modal Analysis ◽  
Real World ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Simulation Results ◽  
Element Method

Modal analysis provides the dynamic behavior of an object or structure, and is often undertaken using the Finite Element Method (FEM) due to its ability to deal with arbitrary geometries. This article investigates the use of Augmented Reality (AR) to provide the in situ visualization of a modal analysis for an aluminum impeller. Finite Element Analysis (FEA) software packages regularly use heat maps and shape deformation to visualize the outcomes of a given simulation. AR allows the superimposition of digital information on a view of the real-world environment, and provides the opportunity to overlay such simulation results onto real-world objects and environments. The presented modal analysis undertaken herein provides natural frequencies and the corresponding deformation of an aluminum impeller. The results indicate the ability for the design part and finite element analysis results to be viewed on the physical part. A mobile AR-FEA-based system was developed for Modal Analysis result visualization. This study offers designers and engineers a new way to visualize such simulation results.

scholarly journals Desain dan Analisis Tegangan Alat Pengangkat Roket Kapasitas 10 Ton Menggunakan Metode Elemen Hingga

2019 ◽  
Vol 2 (01) ◽  
pp. 23-26
Author(s):  
Lasinta Ari Nendra Wibawa
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Von Mises Stress ◽  
The Finite Element Method ◽  
Safety Factors ◽  
Element Analysis ◽  
Simulation Results ◽  
Von Mises ◽  
Aluminum Alloy 7075

This study examines the design and stress analysis of a 10 ton capacity rocket lifting device using the finite element method. The material used is Aluminum alloy 7075. Finite element analysis is done numerically by using Autodesk Inventor Professional 2017. software The simulation results show that the structure of the rocket lift has Von Mises stress, deformation, mass, and safety factors of 46.34 MPa, 0.7947 mm, 186.75 kg, and 3.13.

Finite Element Analysis of the Temperature Field and Strain Field of Coating Rod in Friction Surfacing

2010 ◽  
Vol 97-101 ◽  
pp. 1433-1437
Author(s):  
Xue Mei Liu ◽  
Zeng Da Zou ◽  
Xin Hong Wang ◽  
Shi Yao Qu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temperature Field ◽  
Strain Field ◽  
Radial Direction ◽  
Effective Strain ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Friction Surfacing ◽  
Simulation Results

In friction surfacing process, the temperature field and strain field, especially of coating rod, is considered an important element in analyzing the process’ mechanism and choosing the key process parameters properly. In this paper, the finite element method was employed to simulate the coupling of 3-D temperature field and deformation field of coating rod during friction surfacing. The simulation results show that at the preliminary preheating period, the isotherm goes down at the center part, and the temperature field presents “M” along the radial direction. The temperature increasing rate at the friction interface is higher at first, and then become lower, once the friction system becomes quasi-steady, the temperature here will be stable approximately. The largest effective strain occurs near the center of bottom circle. The simulation results are close to the experimental results, thus builds a basis for analyzing the process’s mechanism, allows for theoretical guidance for analyzing feasibility and helps optimize key parameters.

Research of Force in Piercing Process by FEM Simulation

2012 ◽  
Vol 482-484 ◽  
pp. 62-65 ◽  
Author(s):  
Lu Lu ◽  
Zhao Xu Wang ◽  
Fu Zhong Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Methods ◽  
Fem Simulation ◽  
Dynamic Evolution ◽  
Physical Parameters ◽  
The Finite Element Method ◽  
Simulation Results ◽  
The Stability ◽  
Future Plans

In this paper, the finite element method (FEM) is used for simulation of piercing process of the tube in Mannesmann mill. The sensitivity of the simulation results to numerical methods and physical parameters is discussed. The simulated results visualize dynamic evolution of force in the piercing process. The stability of the process and force condition is analyzed by FEM simulation. The model is verified by comparing the values of calculated force parameters and those measured in laboratory conditions. Finally, the future plans are presented.

Finite Element Simulation of Crack Testing System of Electromagnetic Acoustic Emission Based on ANSYS

2012 ◽  
Vol 424-425 ◽  
pp. 1097-1101 ◽  
Author(s):  
Qing Yang Zou ◽  
Xiu Cheng Dong
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Acoustic Emission ◽  
Crack Tip ◽  
Metal Plate ◽  
Testing System ◽  
The Finite Element Method ◽  
Whole Process ◽  
Element Simulation ◽  
Simulation Results

The finite element method is adopted to simulate the whole process of electromagnetic acoustic emission in this paper. The effects of different voltage on distribution of displacement and temp at the tip of the crack are discussed. The simulation results show that, above voltage loading on the metal plate, the value of the temp around the crack tip can be up to the melting point , which will melt the tip of crack. Larger melting sizes are obtained when loading voltage is increased. At the same case, the displacement duo to electromagnetic force at crack tip is much larger than this induced by thermal expansion

Towards Predicting Relative Belt Edge Endurance With the Finite Element Method

1990 ◽  
Vol 18 (4) ◽  
pp. 216-235 ◽  
Author(s):  
J. De Eskinazi ◽  
K. Ishihara ◽  
H. Volk ◽  
T. C. Warholic
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
The Finite Element Method ◽  
Shear Deformations ◽  
Element Analysis ◽  
Vertical Loading ◽  
Predicted Values ◽  
Element Method

Abstract The paper describes the intention of the authors to determine whether it is possible to predict relative belt edge endurance for radial passenger car tires using the finite element method. Three groups of tires with different belt edge configurations were tested on a fleet test in an attempt to validate predictions from the finite element results. A two-dimensional, axisymmetric finite element analysis was first used to determine if the results from such an analysis, with emphasis on the shear deformations between the belts, could be used to predict a relative ranking for belt edge endurance. It is shown that such an analysis can lead to erroneous conclusions. A three-dimensional analysis in which tires are modeled under free rotation and static vertical loading was performed next. This approach resulted in an improvement in the quality of the correlations. The differences in the predicted values of various stress analysis parameters for the three belt edge configurations are studied and their implication on predicting belt edge endurance is discussed.

Tire Cornering Simulation Using an Explicit Finite Element Analysis Code

1998 ◽  
Vol 26 (2) ◽  
pp. 109-119 ◽  
Author(s):  
M. Koishi ◽  
K. Kabe ◽  
M. Shiratori
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Test System ◽  
Experimental Results ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Explicit Finite Element ◽  
Explicit Finite Element Analysis ◽  
Element Method

Abstract The finite element method has been used widely in tire engineering. Most tire simulations using the finite element method are static analyses, because tires are very complex nonlinear structures. Recently, transient phenomena have been studied with explicit finite element analysis codes. In this paper, the authors demonstrate the feasibility of tire cornering simulation using an explicit finite element code, PAM-SHOCK. First, we propose the cornering simulation using the explicit finite element analysis code. To demonstrate the efficiency of the proposed simulation, computed cornering forces for a 175SR14 tire are compared with experimental results from an MTS Flat-Trac Tire Test System. The computed cornering forces agree well with experimental results. After that, parametric studies are conducted by using the proposed simulation.

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