A Comparison of Flattening and Indentation Approaches for Contact Mechanics Modeling of Single Asperity Contacts

2005 ◽  
Vol 128 (1) ◽  
pp. 209-212 ◽  
Author(s):  
Robert L. Jackson ◽  
Lior Kogut
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Relative Strength ◽  
Empirical Models ◽  
Contact Condition ◽  
The Finite Element Method ◽  
Single Asperity ◽  
Asperity Contacts ◽  
Contact Parameters

This study compares the flattening and indentation approaches for modeling single asperity contacts in order to reveal quantitatively their different behaviors in terms of the constitutive relationships for the contact parameters and deformation regimes. The comparison is performed with four empirical models recently developed for flattening and indentation based on the finite element method. In the elasto-plastic regime, the classic Hertz solution does not hold and, therefore, different mechanical behavior was obtained for flattening and indentation cases. Consequently, the contact condition and relative strength of mating surfaces should be considered when choosing between indentation or flattening models.

DESIGN AND ANALYSIS OF NEW STENT PATTERNS FOR ENHANCED PERFORMANCE

2020 ◽  
Vol 20 (06) ◽  
pp. 2050039
Author(s):  
NISANTHKUMAR PANNEERSELVAM ◽  
SREEKUMAR MUTHUSWAMY
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Blood Flow ◽  
Coronary Artery ◽  
Mechanical Behavior ◽  
Internal Diameter ◽  
Cell Design ◽  
The Finite Element Method ◽  
Stent Expansion ◽  
Stenting Procedure

Deploying a stent to restore blood flow in the coronary artery is very complicated, as its internal diameter is smaller than 3[Formula: see text]mm. It has already been proven that mechanical stresses induced on stent and artery during deployment make the placement of stent very difficult, besides the development of complications due to artery damage. Various stent designs have already been developed, especially in the metallic category. Still, there are possibilities for developing new stent designs and patterns to overcome the complexities of the existing models. Also, the technology of metallic stents can be carried forward towards the development of bioresorbable polymeric stents. In this work, three new stent cell designs (curvature, diamond, and oval) have been proposed to obtain better performance and life. The finite element method is utilized to explore the mechanical behavior of stent expansion and determine the biomechanical stresses imposed on the stent and artery during the stenting procedure. The results obtained have been compared with the available literature and found that the curvature cell design develops lower stresses and, hence, be suitable for better performance and life.

Investigation of API 8 Round Casing Connection Performance—Part I: Introduction and Method of Analysis

1984 ◽  
Vol 106 (1) ◽  
pp. 130-136 ◽  
Author(s):  
W. T. Asbill ◽  
P. D. Pattillo ◽  
W. M. Rogers
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Internal Pressure ◽  
Mechanical Behavior ◽  
Experimental Analysis ◽  
Strain Gages ◽  
The Finite Element Method ◽  
Strength Of Materials ◽  
Methods Of Analysis ◽  
Element Method

The purpose of this investigation was to gain a better understanding into the mechanical behavior of the API 8 Round casing connection, when subjected to service loads of assembly interference, tension and internal pressure. The connection must provide both structural and sealing functions and these functions were evaluated by several methods. Part I discusses the methods of analysis, which include hand calculations using strength of materials, finite element method via unthreaded and threaded models, and experimental analysis using strain gages. Comparisons of all three methods are made for stresses and show that the finite element method accurately models connection behavior.

scholarly journals Extended finite element method for simulating the mechanical behavior of multiple random holes and inclusions in functionally graded material

2017 ◽  
Vol 20 (K2) ◽  
pp. 141-147
Author(s):  
Bang Kim Tran ◽  
Huy The Tran ◽  
Tinh Quoc Bui ◽  
Thien Tich Truong
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Functionally Graded Material ◽  
Extended Finite Element Method ◽  
Functionally Graded ◽  
The Finite Element Method ◽  
Extended Finite Element ◽  
Graded Material ◽  
Element Method

Analysis of mechanical behavior of a structure containing defects such as holes and inclusions is essential in many engineering applications. In many structures, the discontinuities may have a significant influence on the reduction of the structural stiffness. In this work, we consider the effect of multiple random holes and inclusions in functionally graded material (FGM) plate and apply the extended finite element method with enrichment functions to simulate the mechanical behavior of those discontinuous interfaces. The inclusions also have FGM properties. Numerical examples are considered and their obtained results are compared with the COMSOL, the finite element method software.

Meso modeling of silk wire rope scaffolds in tissue engineering

2016 ◽  
Vol 47 (3) ◽  
pp. 377-389 ◽  
Author(s):  
Sayyed Behzad Abdellahi ◽  
Elham Naghashzargar ◽  
Dariush Semnani
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Element Model ◽  
Maximum Error ◽  
Wire Rope ◽  
The Finite Element Method ◽  
Energy Potential ◽  
Wire Ropes ◽  
Element Method

Finite element method can provide valuable results and information to evaluate and assess the mechanical behavior of tissue engineered scaffolds. In this investigation, a structurally and analytically based model is applied to analyze and to describe the mechanical properties of wire rope yarns as scaffold or other applications in textile engineering. In order to modeling the mechanical behavior of single yarn, non-linear hyperfoam model with three strain energy potential has been used. The results of finite element model are compared with an experimental approach and showed good agreement between software and experimental analysis with a maximum error at break of about 4.3%. As a result, validation of the finite element method is guaranteed for analysis of other structure of multi twisted yarn or wire ropes.

Mechanical behavior of coronary stents investigated through the finite element method

2002 ◽  
Vol 35 (6) ◽  
pp. 803-811 ◽  
Author(s):  
Francesco Migliavacca ◽  
Lorenza Petrini ◽  
Maurizio Colombo ◽  
Ferdinando Auricchio ◽  
Riccardo Pietrabissa
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Coronary Stents ◽  
The Finite Element Method ◽  
Element Method

Applications of Crystal Plasticity in Contact Mechanics

2008 ◽  
Author(s):  
R. W. Neu ◽  
J. J. Dawkins ◽  
M. Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Contact Mechanics ◽  
Crystalline Structure ◽  
Crystal Plasticity ◽  
Metals And Alloys ◽  
The Finite Element Method ◽  
Severe Limitation ◽  
Structural Metals

The microstructures of structural metals and alloys are highly heterogeneous due to their crystalline structure often coupled with multiple phases and inclusions, yet most contact mechanics models assume the material is homogeneous and usually isotropic. This is a severe limitation if one desires to quantify the influence of different microstructure attributes on the mechanical behavior. This limitation is overcome through the finite element method using crystal plasticity models. Examples of normal, sliding, and fretting contacts are presented.

scholarly journals Analysis of the braking longitudinal force considered by NBR7187 (2003) through a case study

2014 ◽  
Vol 7 (5) ◽  
pp. 801-816
Author(s):  
G. C. Bettazzi ◽  
T. B. Dumêt
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Cross Section ◽  
Longitudinal Force ◽  
Railway Bridge ◽  
The Finite Element Method ◽  
Fem Method ◽  
Real Behavior

This paper analyzed the mechanical behavior of a railway bridge by the Finite Element Method and by monitoring strain deformations with extensometry during its operation. To represent the situations that occur in its operation, tests were made with train braking. The results of monitoring the bottom cross section of column P15 of the bridge are presented. Based on the obtained data, the deformations occurring during the tests are verified against the calculated values obtained by the FEM method and those prescribed by NBR 7187(2003). The comparison between the real behavior of the structure, recorded experimentally through extensometry, and the numerical forecast and its assumptions from the project conceived was done. From this comparison, it verified that the value of longitudinal force due to braking recommended by the standard is appropriate.

Finite Element Analysis of a Steel Bracket

2014 ◽  
Vol 1061-1062 ◽  
pp. 584-587
Author(s):  
Xiao Liang Chen ◽  
Zuan Tian ◽  
Yuan Ping Li
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Sheet Metal ◽  
Theoretical Method ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Stress And Deformation ◽  
Element Method

With the development of the society, sheet metal filing cabinets have become popular in the office. When filing cabinets store too many paper documents, the interlayer splints often fail because of the failure of the small brackets below. The stress and deformation of brackets were studied by the theoretical method and the finite element method. Results show some small machining shape defects have little influence on the mechanical behavior of brackets. The failure reason of small brackets is not the strength, but the instability.

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