Stress Concentration Equations for Straight-Shank and Countersunk Holes in Plates

1995 ◽  
Vol 62 (1) ◽  
pp. 248-249 ◽  
Author(s):  
K. N. Shivakumar ◽  
J. C. Newman
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Three Dimensional ◽  
Poisson's Ratio ◽  
Loading Conditions ◽  
Large Plate ◽  
Isotropic Materials ◽  
Dimensional Finite Element ◽  
Bending Loads ◽  
Three Dimensional Finite Element

Stress concentration equations for straight shank and countersunk holes in a large plate subjected to various loading conditions encountered in service were developed from three-dimensional finite element solutions. For straight shank holes, three types of loading: remote tension, remote bending, and pin loading were considered; and for the countersunk hole only remote tension and bending loads were considered. The equations are within one percent of the finite element results and are valid for isotropic materials with Poisson’s ratio of 0.3.

An Experimental and Numerical Analysis of Riveted Single Lap Joints

1994 ◽  
Vol 208 (2) ◽  
pp. 79-90 ◽  
Author(s):  
C-P Fung ◽  
J Smart
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Three Dimensional ◽  
Element Model ◽  
Lap Joints ◽  
Published Data ◽  
Single Lap Joints ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Stress Patterns

Countersunk and snap riveted single lap joints have been examined both experimentally and numerically. A total of 11 specimens were fatigued to failure with failures occurring in either the plate or the rive***r. The failures have been metallurgically examined to determine the cause of failure. The joints have also been analysed using the finite element method. Initially a single lap joint has been modelled as a ‘stepped plate’ and the results for the stress concentration factor found to be in reasonable agreement with published data. However, the stress concentration for this joint occurred at a point away from the point of failure of a riveted joint. A fuller three-dimensional finite element model has been constructed and the stress patterns around the rivet determined. These stress patterns are discussed in relation to the results from the metallurgical examination.

Study on Mechanism of Crack on Upstream Surface of Super-High Arch Dam

2013 ◽  
Vol 438-439 ◽  
pp. 1325-1328
Author(s):  
Jun Feng Guan ◽  
Long Bang Qing ◽  
Juan Wang ◽  
Wei Feng Bai ◽  
Yu Hu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Concentration ◽  
Three Dimensional ◽  
Arch Dam ◽  
High Arch Dam ◽  
Transverse Joint ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Element Method

A kind of crack with similar characteristics has been discovered on the upstream surface of super-high arch dam. In this paper, the reason of cracking was analyzed by the three-dimensional finite element method. It is found that the stress concentration of concrete near the water-stop structure led to the concrete initial cracking in the process of transverse joint open.

Comparisons of contact pressures of crowned rollers

2000 ◽  
Vol 214 (2) ◽  
pp. 147-156 ◽  
Author(s):  
S. H. Ju ◽  
T. L. Horng ◽  
K. C. Cha
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Concentration ◽  
Contact Surface ◽  
Three Dimensional ◽  
Accurate Analysis ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Contact Pressures

The present work determines the contact pressure and stress concentration between the crowned roller and the raceway by using three-dimensional finite element analysis. A number of crowned profiles with various dimensions were examined. Fine meshes and node-to-Hermit-surface contact elements were used along the contact surface in order to obtain accurate analysis results. A table was generated to show the stress concentration near the roller edge for various crowned profiles and dimensions. This table indicates that the exponential profile is the optimal crowned profile to eliminate stress concentration.

scholarly journals Modeling of Dental Implant Osseointegration Progress by Three-Dimensional Finite Element Method

2020 ◽  
Vol 10 (16) ◽  
pp. 5561
Author(s):  
Iulia Roatesi ◽  
Simona Roatesi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Concentration ◽  
Cortical Bone ◽  
Three Dimensional ◽  
Biomechanical Properties ◽  
Biomechanical Assessment ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Element Method

As osseointegration is a time-dependent process, biomechanical assessment is thought to determine whether a fibrous encapsulation or a bone covering will develop around an implant, according to the stress in the implant and surrounding bone. This study proposes a model for stress evaluation by finite element method (FEM) during the osseointegration progress, the main factor implied in implant success or failure. The loadings due to masticatory forces generate stress concentration and consequently, an adequate risk concerning the implant stability should be assessed. An accurate FEM model is used to calculate the stress and displacement in the whole implant–bone system during the osseointegration progress. This process is simulated by taking into account the gradual increase in the damaged biomechanical properties of the cortical bone. The results reveal that as the implant osseointegration occurs gradually, the bone stiffness from the peri-implant area increases gradually, such that in the end (healing) we observed that the cortical bone begins to take over the bending loading. In addition, the displacements decrease as the osseointegration gradually occurs and the cortical bone stress reaches higher values, which are placed in the mandibular ridge. The FEM is suitable to model the osseointegration progress, offering valuable information concerning the stress concentration zones in the implant–bone system and consequently, the risk evaluation, both for pre- and post-osseointegration.

Three-Dimensional Finite Element Analysis of Doweled Joints for Airport Pavements

2003 ◽  
Vol 1853 (1) ◽  
pp. 100-109 ◽  
Author(s):  
Jiwon Kim ◽  
Keith D. Hjelmstad
Keyword(s):  
Finite Element ◽  
Load Transfer ◽  
Concrete Slab ◽  
Three Dimensional ◽  
Nonlinear Material ◽  
Structural Behavior ◽  
Loading Conditions ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Analytical Approaches

Various aspects of the structural behavior of doweled joints, including load transfer, in rigid airport pavement systems are investigated by using nonlinear three-dimensional finite element methods. The finite element models include two concrete slab segments connected by dowels. The concrete slab and supporting layers are simulated by continuum solid elements. Solid elements can capture the severe local deformation in the concrete slab in the vicinity of wheel loads. They allow the modeling of nonlinear material response of the supporting layers and of frictional contact between the concrete slabs and supporting layers. These features generally are not considered in classical analytical approaches. The structural behavior of the doweled joint is investigated for various design and loading conditions, including tire pressure, slab thickness, dowel looseness, and different landing gear configurations. An attempt is made to quantify the amount and efficiency of load transfer through the dowels. According to the finite element results, 15% to 30% of the applied wheel load is transferred to the adjacent slab segment by the dowels in an intact joint, depending on design and loading conditions. In addition, 95% of the transferred shear force is carried only by the 9 or 11 dowels that are closest to the applied load.

Study on Stress Concentration and Fatigue of Prosthetic Blood Vessels

2013 ◽  
Vol 647 ◽  
pp. 413-417
Author(s):  
Guo Ping Chen ◽  
Shui Wen Zhu
Keyword(s):  
Mechanical Property ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Concentration ◽  
Blood Vessels ◽  
Three Dimensional ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

The purpose of this paper is to investigate the stress concentration and fatigue of the prosthetic blood vessels. A three-dimensional finite element analysis was performed with three loading. The good man fatigue thoery was introduced for the fatigue study. As the results, the stress concentration and fatigue mode can be determined. The results prove that the mechanical property of the prosthetic blood vessels can be smiulated through the finite element analysis.

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