Three-Dimensional Endmill Dynamics: Modal Development and Experimental Validation

2011 ◽  
Author(s):  
Bekir Bediz ◽  
Uttara Kumar ◽  
Burak Ozdoganlar ◽  
Tony L. Schmitz
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Impact Testing ◽  
Cross Sectional ◽  
Macro Scale ◽  
Model Predictions ◽  
Bending Modes ◽  
Milling Tools ◽  
Better Than

In this paper the three-dimensional dynamic behavior of macro-scale milling tools is modeled using the spectral-Tchebychev technique while considering the actual fluted cross-sectional geometry and pretwisted shape of the tools. The bending and torsional behavior of three different fluted endmills is compared to finite element predictions and experimental results obtained using impact testing with free-free boundary conditions. The percent difference between experiment and the spectral-Tchebychev method predictions is shown to be 3% or less for all three tools while considering the first six bending modes and first two torsional modes. For the same modes, the spectral-Tchebychev and finite element model predictions agreed to better than 1%.

Three-Dimensional Reconstruction of Three Real Roots Included Periodontal Ligament and Implant Study

2014 ◽  
Vol 575 ◽  
pp. 931-934
Author(s):  
Qi Wang ◽  
Ling Chen ◽  
Zhong Zhang ◽  
Xing Hua Niu
Keyword(s):  
Finite Element ◽  
Periodontal Ligament ◽  
Three Dimensional ◽  
Element Model ◽  
Imaging Method ◽  
Element Analysis ◽  
Cross Sectional ◽  
The Real ◽  
Engineering Software ◽  
Ct Data

To investigate the periodontal ligament contains the real root of the three model cases, a combination of different implant and tooth variation of the stress distribution for the subsequent three root implant biomechanics analysis provides digital models. Methods: Mimics and Geomagic reverse engineering software for digital imaging method to obtain CT data processing. And the use of UG assembled in ANSYS workbench in finite element analysis. Results: A consistent with the real situation of three tooth root finite element model which contains periodontal ligament, and found that with the dental implant junction with the cross-sectional area decreases, where the stress amplitude fluctuations increases.

Three Dimensional Structural Analysis of Complex Sluice Chamber Structures

2012 ◽  
Vol 170-173 ◽  
pp. 1971-1976
Author(s):  
Hong Yun Si ◽  
Min Chen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Element Analysis ◽  
3D Finite Element ◽  
Massive Structure ◽  
Floor Structure ◽  
The Finite Element Model ◽  
Better Than

This paper mainly introduces how to use the software of Marc to calculate the displacement and stress of the sluice. The finite element model which concludes the sluice, piles and foundation was structured for calculation and analysis using the contact analysis function provided by the program. the displacement and stress of the massive structure was worked out to estimate its whole stability and evaluate workability state of the sluice under different structures. The example shows that the results of 3D finite element analysis can be used to accurately reflect the state of the buildings overall strength and displacement. The integral floor structure of contrary arch floor sluice is better than the separated floor structure to adapt to the foundation uneven settlement, but the separated floor structure of contrary arch floor sluice makes stress form more reasonable.

A Dynamic, Nonlinear Finite-Element Model of a Human Leg

1979 ◽  
Vol 101 (3) ◽  
pp. 176-184 ◽  
Author(s):  
T. K. Hight ◽  
R. L. Piziali ◽  
D. A. Nagel
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Complex Loading ◽  
Element Model ◽  
Nonlinear Finite Element ◽  
Cross Sectional ◽  
Downhill Skiing ◽  
Stiffness Characteristics ◽  
Nonlinear Finite Element Model

The development of a dynamic, nonlinear finite-element model of a human leg is presented. The model is designed to accommodate large three-dimensional displacements and rotations, to accurately reflect the nonlinear stiffness characteristics of the knee joint, and to facilitate efficient stress-level calculations. Numerical examples are presented which demonstrate the nonlinear capabilities of the model. In addition, a brief example illustrates the ability of the model to respond to a complex loading history measured during a downhill skiing maneuver and to predict cross-sectional stress levels.

Torsional Analysis of a Steel Cord-Rubber Tire Belt Structure

1996 ◽  
Vol 24 (4) ◽  
pp. 339-348 ◽  
Author(s):  
R. M. V. Pidaparti
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Composite Structures ◽  
Three Dimensional ◽  
Element Model ◽  
Torsional Stiffness ◽  
Element Analysis ◽  
Rubber Belt ◽  
Steel Cord ◽  
Torsional Analysis

Abstract A three-dimensional (3D) beam finite element model was developed to investigate the torsional stiffness of a twisted steel-reinforced cord-rubber belt structure. The present 3D beam element takes into account the coupled extension, bending, and twisting deformations characteristic of the complex behavior of cord-rubber composite structures. The extension-twisting coupling due to the twisted nature of the cords was also considered in the finite element model. The results of torsional stiffness obtained from the finite element analysis for twisted cords and the two-ply steel cord-rubber belt structure are compared to the experimental data and other alternate solutions available in the literature. The effects of cord orientation, anisotropy, and rubber core surrounding the twisted cords on the torsional stiffness properties are presented and discussed.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

scholarly journals Comparison of Tooth- and Bone-Borne Appliances on the Stress Distributions and Displacement Patterns in the Facial Skeleton in Surgically Assisted Rapid Maxillary Expansion—A Finite Element Analysis (FEA) Study

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1152
Author(s):  
Rafał Nowak ◽  
Anna Olejnik ◽  
Hanna Gerber ◽  
Roman Frątczak ◽  
Ewa Zawiślak
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Rapid Maxillary Expansion ◽  
Stress Distributions ◽  
Maxillary Expansion ◽  
Facial Skeleton ◽  
Element Analysis ◽  
Maxillary Constriction

The aim of this study was to compare the reduced stresses according to Huber’s hypothesis and the displacement pattern in the region of the facial skeleton using a tooth- or bone-borne appliance in surgically assisted rapid maxillary expansion (SARME). In the current literature, the lack of updated reports about biomechanical effects in bone-borne appliances used in SARME is noticeable. Finite element analysis (FEA) was used for this study. Six facial skeleton models were created, five with various variants of osteotomy and one without osteotomy. Two different appliances for maxillary expansion were used for each model. The three-dimensional (3D) model of the facial skeleton was created on the basis of spiral computed tomography (CT) scans of a 32-year-old patient with maxillary constriction. The finite element model was built using ANSYS 15.0 software, in which the computations were carried out. Stress distributions and displacement values along the 3D axes were found for each osteotomy variant with the expansion of the tooth- and the bone-borne devices at a level of 0.5 mm. The investigation showed that in the case of a full osteotomy of the maxilla, as described by Bell and Epker in 1976, the method of fixing the appliance for maxillary expansion had no impact on the distribution of the reduced stresses according to Huber’s hypothesis in the facial skeleton. In the case of the bone-borne appliance, the load on the teeth, which may lead to periodontal and orthodontic complications, was eliminated. In the case of a full osteotomy of the maxilla, displacements in the buccolingual direction for all the variables of the bone-borne appliance were slightly bigger than for the tooth-borne appliance.

Reduction of Free-Edge Stress Concentration

1985 ◽  
Vol 52 (4) ◽  
pp. 801-805 ◽  
Author(s):  
P. R. Heyliger ◽  
J. N. Reddy
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Element Model ◽  
Free Edge ◽  
Shear Stresses ◽  
Normal Stresses ◽  
Interlaminar Shear ◽  
Three Dimensional Elasticity

A quasi-three dimensional elasticity formulation and associated finite element model for the stress analysis of symmetric laminates with free-edge cap reinforcement are described. Numerical results are presented to show the effect of the reinforcement on the reduction of free-edge stresses. It is observed that the interlaminar normal stresses are reduced considerably more than the interlaminar shear stresses due to the free-edge reinforcement.

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