Contact Stiffness Parameters for Finite Element Modeling of Contact

2019 ◽  
Vol 799 ◽  
pp. 211-216
Author(s):  
Alina Sivitski ◽  
Priit Põdra
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Contact Stiffness ◽  
Influential Factors ◽  
Element Analysis ◽  
Normal Contact ◽  
Element Modeling ◽  
Contact Models ◽  
Machine Elements ◽  
Normal Contact Pressure

Contact modeling could be widely used for different machine elements normal contact pressure calculations and wear simulations. However, classical contact models as for example Hertz contact models have many assumptions (contact bodies are elastic, the contact between bodies is ellipse-shaped, contact is frictionless and non-conforming). In conditions, when analytical calculations cannot be performed and experimental research is economically inexpedient, numerical methods have been applied for solving such engineering tasks. Contact stiffness parameters appear to be one of the most influential factors during finite element modeling of contact. Contact stiffness factors are usually selected according to finite element analysis software recommendations. More precise analysis of contact stiffness parameters is often required for finite element modeling of contact.

scholarly journals Developing an Extended IFC Data Schema and Mesh Generation Framework for Finite Element Modeling

2019 ◽  
Vol 2019 ◽  
pp. 1-19
Author(s):  
Zhao Xu ◽  
Zezhi Rao ◽  
Vincent J. L. Gan ◽  
Youliang Ding ◽  
Chunfeng Wan ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Element Modeling ◽  
Mesh Generation ◽  
Geometric Model ◽  
Information Modeling ◽  
Element Analysis ◽  
Element Modeling ◽  
The Finite Element Analysis ◽  
Ifc Standard

Mesh generation plays an important role in determining the result quality of finite element modeling and structural analysis. Building information modeling provides the geometry and semantic information of a building, which can be utilized to support an efficient mesh generation. In this paper, a method based on BRep entity transformation is proposed to realize the finite element analysis using the geometric model in the IFC standard. The h-p version of the finite element analysis method can effectively deal with the refined expression of the model of bending complex components. By meshing the connection model, it is suggested to adopt the method of scanning to generate hexahedron, which improves the geometric adaptability of the mesh model and the quality and efficiency of mesh generation. Based on the extension and expression of IFC information, the effective finite element structure information is extracted and extended into the IFC standard mode. The information is analyzed, and finally the visualization of finite element analysis in the building model can be realized.

A Meta-Object Based Approach to Finite Element Modeling

2001 ◽  
Author(s):  
Santosh Shanbhag ◽  
Ian R. Grosse ◽  
Jack C. Wileden ◽  
Alan Kaplan
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Production Model ◽  
Engineering Analysis ◽  
Demand Model ◽  
Element Analysis ◽  
Modeling And Analysis ◽  
Element Modeling ◽  
Molded Part ◽  
Analysis Models

Abstract With the integration of CAD and FEA software packages, design engineers who are not skilled in finite element analysis are performing finite element modeling and analysis. Furthermore, in the analysis of a system, engineers often make numerous modeling simplifications and analysis assumptions depending on the trade-off between cost, accuracy, precision or other engineering analysis objectives. Thus, reusability or interoperability of engineering analysis models is difficult and often impractical due to the wealth of knowledge involved in the creation of such models and the lack of formal methods to codify and explicitly represent this critical modeling knowledge. Most institutions and organizations have started documenting these simplifications and assumptions, making them understandable for the other engineers within the organization. However, this does not allow a seamless exchange of data or interoperability with other analysis models of similar or dissimilar nature. This plays a very important role in today’s market, which is moving away from the traditional make-to-stock production model to a build-to-demand model. We address these issues in this paper by adopting and extending the computer science concept of meta-object, and applying it in novel ways to the domain of FEA and the representation of finite element modeling knowledge. We present a taxonomy for engineering models that aids in the definition of the various object analysis classes. A simple beam analysis example, followed by a more realistic injection-molded part example. The latter example involves injection-mold filling simulation, thermal cooling, and part ejection analyses which are subclasses for a generic manufacturing analysis meta-object class. Prototype implementations of automated support for this meta-object approach to finite element modeling is in progress.

Contact Stresses in Dovetail Attachments: Finite Element Modeling

1999 ◽  
Author(s):  
G. B. Sinclair ◽  
N. G. Comier ◽  
J. H. Griffin ◽  
G. Meda
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Element Modeling ◽  
Stress Analysis ◽  
High Stress ◽  
Contact Stresses ◽  
Computational Effort ◽  
Element Analysis ◽  
Element Modeling ◽  
Stress Gradients

The stress analysis of dovetail attachments presents some challenges. These challenges stem from the high stress gradients near the edges of contact and from the nonlinearities attending conforming contact with friction. To meet these challenges with a finite element analysis, refined grids are needed with mesh sizes near the edges of contact of the order of one percent of the local radii of curvature there. A submodeling procedure is described which can provide grids of sufficient resolution in return for moderate computational effort. This procedure furnishes peak stresses near contact edges which are converging on a sequence of three submodel grids, and which typically do converge to within about five percent.

The Tip/Tilp Mirror Modal Analysis Based on Flexible Connection of Equivalent Spring

2014 ◽  
Vol 697 ◽  
pp. 226-229
Author(s):  
Cai Ling Wang ◽  
Hong Wei Wang
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Modal Analysis ◽  
Detection System ◽  
Mirror System ◽  
Test Results ◽  
Element Analysis ◽  
Element Modeling ◽  
The Finite Element Analysis ◽  
Resonance Detection

According to flexible connectivity of space stabilization system,This paper proposes the finite element analysis method using multiple equivalent spring connecting unit to replace the original flexible connections. And the elastic coefficient’s correspondence between the equivalent spring and the original spring were deduced. Using the equivalent spring method, the tip/tilt mirror system for finite element modeling is completed, After completion of the modal analysis, first-order resonant frequency is calculated. At last, the tip/tilt mirror system is tested in non-contact laser resonance detection system, And test results and modal analysis results were compared, and results show that the finite element modeling method of using equivalent spring connecting is effective. Provide constructive reference for subsequent tip/tilt mirror design, has a very important reference for similar projects.

Intelligent Automatic Mesh Generation for Multichip Modules

1993 ◽  
Author(s):  
Anagha G. Jog ◽  
Ian R. Grosse ◽  
Daniel D. Corkill
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Mesh Generation ◽  
A Priori ◽  
Three Dimensional ◽  
Element Model ◽  
Design Tool ◽  
Element Analysis ◽  
Modeling And Analysis ◽  
Element Modeling

Abstract Currently, the pre-processing stage of finite element analysis is a major stumbling block towards automation of the entire finite element modeling and analysis (FEMA) process. The lack of complete automation of FEMA greatly limits its impact as a design tool. This paper presents a blackboard-based, object-oriented modeling system for intelligent a-priori automatic three dimensional mesh generation. The modeling system enables the user to define the physical system at a natural domain-specific high level of abstraction and automatically derives lower-level finite element model representations. Knowledge sources interact with the blackboard to make modeling idealizations and select optimal meshing strategies. An example application in the domain of finite element modeling of multi-chip module microelectronic devices is presented.

Finite-Element Modeling of Residual Stress in SiC Diaphragms

1998 ◽  
Vol 518 ◽  
Author(s):  
Russell G. DeAnna ◽  
Christian A. Zorman ◽  
Mehran Mehregany
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Finite Element Modeling ◽  
Film Growth ◽  
Chemical Vapor ◽  
Etching Process ◽  
Si Substrate ◽  
Element Analysis ◽  
Element Modeling ◽  
Pressure Chemical

AbstractFinite-element modeling of the residual stress due to expansion-coefficient mismatch between a 3C-SiC film and Si substrate is presented. The change in residual stress after bulk etching of the silicon substrate to create a suspended diaphragm is also presented. 1, 2, or 3 μm-thick 3C-SiC films are grown at 1600 K on a 100 mm diameter, 500 μm-thick, (100) Si substrate using atmospheric pressure chemical vapor deposition (APCVD) in a cold-wall, vertical-geometry, RF-induction-heated reactor. An axisymmetric, finite-element analysis (FEA) of the cooling and etching process is presented using the ANSYS54 finite-element package. The etching process is modeled by removing the Si elements in the etched region after cooling from film-growth to room temperature. The results show that residual stress in the diaphragm decreases from 3 to 8 percent after etching.

Contact Analysis for Joint Interfaces of Machine Tools Based on a 3-D Anisotropic Asperity Model

2011 ◽  
Vol 189-193 ◽  
pp. 114-120 ◽  
Author(s):  
Hai Tao Liu ◽  
Wan Hua Zhao ◽  
Jun Zhang
Keyword(s):  
Finite Element ◽  
Contact Pressure ◽  
Contact Stiffness ◽  
Contact Analysis ◽  
Joint Interface ◽  
Average Height ◽  
Exponential Relationship ◽  
Normal Contact ◽  
Normal Deformation ◽  
Normal Contact Pressure

In this paper, a 3-D contact model for anisotropic rough surfaces based on 3-D statistically measurements is established and finite element contact analysis is conducted. The average height of the asperity (h), the average summit distances between two neighboring peaks of asperities (Sx and Sy) are selected as the characterized parameters of the rough surface. Finite element simulation results show that the normal contact pressure has an exponential relation with the normal deformation and an exact linear relationship between the normal deformation and the real contact pressure of the surfaces is obtained. At last, the normal contact stiffness of the joint interface is obtained empirically with the exponential relationship assumption.

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