Intro1_M07_create_FEA_model

Intro1_M07_create_FEA_model - Create Finite Element Model...

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Unformatted text preview: Create Finite Element Model Chapter 7 February 7, 2006 Inventory #002268 7-2 INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS - Part 1 Part 1 Part 1 Training Manual Chapter 7 – Creating the Finite Element Model A. Overview • The purpose of this chapter is to discuss the meshing element attributes, various means to create a mesh in ANSYS, and finally how to import one’s finite element model directly into ANSYS. Recall, ANSYS does not use the solid model in the solution of the model, rather it needs to use finite elements. February 7, 2006 Inventory #002268 7-3 INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS - Part 1 Part 1 Part 1 Training Manual • Meshing is the process used to “fill” the solid model with nodes and elements, i.e, to create the FEA model. – Remember, you need nodes and elements for the finite element solution, not just the solid model. The solid model does NOT participate in the finite element solution. Solid model FEA model meshing Chapter 7 – Creating the Finite Element Model …Overview February 7, 2006 Inventory #002268 7-4 INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS - Part 1 Part 1 Part 1 Training Manual • There are three steps to meshing: – Define element attributes – Specify mesh controls – Generate the mesh • Element attributes are characteristics of the finite element model that you must establish prior to meshing. They can include: – Element types – Real constants – Material properties – Section properties Chapter 7 – Creating the Finite Element Model B. Element Attributes February 7, 2006 Inventory #002268 7-5 INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS - Part 1 Part 1 Part 1 Training Manual Element Type • The element type is an important choice that determines the following element characteristics: – Degree of Freedom (DOF) set. A thermal element type, for example, has one dof: TEMP , whereas a structural element type may have up to six dof: UX, UY, UZ, ROTX, ROTY, ROTZ . – Element shape -- brick, tetrahedron, quadrilateral, triangle, etc. – Dimensionality -- 2-D (X-Y plane only), or 3-D. – Assumed displacement shape -- linear vs. quadratic. • ANSYS has a “library” of over 170 element types from which you can choose. Details on how to choose the “correct” element type will be presented later. For now, let’s see how to define an element type. Chapter 7 – Creating the Finite Element Model …Element Attributes February 7, 2006 Inventory #002268 7-6 INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS - Part 1 Part 1 Part 1 Training Manual Element category • ANSYS offers many different categories of elements. Some of the commonly used ones are: – Line elements – Shells – 2-D solids – 3-D solids Chapter 7 – Creating the Finite Element Model …Element Attributes February 7, 2006 Inventory #002268 7-7 INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS INTRODUCTION TO ANSYS...
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Intro1_M07_create_FEA_model - Create Finite Element Model...

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