Course Introduction to virtual engineering Óbuda University John von Neumann Faculty of Informatics Institute of Intelligent Engineering Systems Lecture.

Course Introduction to virtual engineering

Óbuda UniversityJohn von Neumann Faculty of Informatics

Institute of Intelligent Engineering Systems

Lecture and laboratory 6.

Finite element mesh and load definition

László Horváth university professor

http://nik.uni-obuda.hu/lhorvath/








Contents

László Horváth ÓU-JNFI-IIES http://nik.uni-obuda.hu/lhorvath/

Completing part models for finite element analysis

Finite elements and placing loads for analysis

Lecture

Creating and studying finite element mesh on a spatial surface (VE6.2)

Laboratory

Definition and optimization of a solid part and its meshing. (VE6.3)

Concept of associative, parametric, and adaptive mesh

Concept of finite element analysis

Introduction by studying typical FEA tasks (VE6.1)

Concept of finite element analysis


Approximation oflocation dependent parameters

as design variablesacting on the design performance

on a finite number of finite elements A numerical method

Edge

Node

Calculation of parameters on nodes in a mesh

Finite Element Modeling (FEM)creates extended part and assembly model

for Finite Element Analysis (FEA)

Completing part models for finite element analysis (preprocessing)


Simplified regions

Preparation of geometric

Convert model fromoutside source

New geometric model

New entities

modelHálógenerálásMesh generation

Controlled by engineer

Automatic correction

Automatic

Refining mesh

Definition of loads andboundary conditions

Checking for consistency and correctness

Optimizing mesh

Preparation of FEM

Selection of materialproperties



One-dimensional

Mesh Elements

Planar

Shell

Solid



Several frequently applied loadsConcentrated and distributed force.

Torque.

Contact pressure.

Acceleration (gravity, translation, rotation).

Temperature on surface.

Concentrated or distributed heat source.

Magnetic.

Boundary conditionsMechanical restraints restrict movements in specified directions and result reaction forces.

Definition of degrees of freedom. Non-restrained nodes have six degrees of freedom.

Placing loads and restraints

Making simulation of real operating conditions possible.

On mesh (at nodes).

On geometry of the part (along lines and on surfaces).

Mathematical expressions.

Automatic contact recognition.

Concept of associative, parametric, and adaptive mesh


Two-way associative connection between shape model and mesh for automatic change of the mesh in case of changed geometry.

Mesh is characterized by parameters mainly for the definition of its dimensions.

Adaptive mesh definition is an automatic modification of mesh density, element order, and element shape.

Density can vary according to the load on each region.

Definition of a mechanical part to be analyzed


Slides 8-13 show main steps of the part definition.

If you can not understand the definition process, please refer to

relevant slide shows for the previous lectures or to the lecturer.

Laboratory task VE6.2 includes definition of this part.











Definition of load and restraint in Finite Element Model (FEM)


Laboratory task VE6.2 includes definition of the subsequent FEM

and FEA model.

Visualization of mesh in Finite Element Model (FEM)


Finite Element Analysis (FEM)


Introduction by studying typical FEA tasks


Laboratory task VE6.1

Source: www.catia.com

Introduction by studying typical FEA tasks



Source: www.catia.com

Definition and optimization of a solid part and its meshing



Creating a solid part model for the purpose of finite element analysis.

Selecting static analysis and definition of global mesh parameters then meshing the part by octree tetrahedron elements.

Definition of material and load.

Studying effect of mesh improving automatisms at the modification of mesh.

Course Introduction to virtual engineering Óbuda University John von Neumann Faculty of Informatics Institute of Intelligent Engineering Systems Lecture.

Documents

iies http

finite element mesh

meshing lszl horvth

contents lszl horvth

adaptive mesh definition

laboratory definition

definition of material

definition of degrees