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Composite Laminate Modeling Composite Laminate Modeling White Paper for Femap and NX Nastran Users Venkata Bheemreddy, Ph.D., Senior Staff Mechanical Engineer Adrian Jensen, PE, Senior Staff Mechanical Engineer Predictive Engineering Femap 11.1.2 White Paper 2014 WHAT THIS WHITE PAPER COVERS This note is intended for new engineers interested in modeling composites and experienced engineers who would like to get acquainted with the Femap interface. This note is intended to accompany a technical seminar and will provide you a starting background on composites. The following topics are covered: o A little background on the mechanics of composites and how micromechanics can be leveraged to obtain composite material properties o 2D composite laminate modeling Defining a material model, layup, property card and material angles Symmetric vs. unsymmetric laminate and why this is important Results post processing o 3D composite laminate modeling Defining a material model, layup, property card and ply/stack orientation When is a 3D model preferred over a 2D model o Modeling a sandwich composite Methods of modeling a sandwich composite 3D vs. 2D sandwich composite models and their pros and cons o Failure modeling of a 2D composite laminate Defining a laminate failure model Post processing laminate and lamina failure indices Predictive Engineering Document, Feel Free to Share With Your Colleagues Page 2 of 66 Predictive Engineering Femap 11.1.2 White Paper 2014 TABLE OF CONTENTS 1. INTRODUCTION ............................................................................................................................................................ 6 1.1 TERMINOLOGY ..................................................................................................................................................................................................6 1.2 TYPES OF MATERIALS .........................................................................................................................................................................................7 1.2.1 Anisotropic Material ...........................................................................................................................................................................7 1.2.2 Orthotropic Material...........................................................................................................................................................................8 1.2.3 Isotropic Material ...............................................................................................................................................................................8 2. COMPOSITE MICROMECHANICS .................................................................................................................................. 9 2.1 RULE OF MIXTURES ...........................................................................................................................................................................................9 2.1.1 Application Example ...........................................................................................................................................................................9 3. LAMINATE MODELING IN FEMAP ................................................................................................................................11 3.1 IMPORTANT ENTITIES .......................................................................................................................................................................................12 3.2 DEFINING AN ORTHOTROPIC MATERIAL ...............................................................................................................................................................13 3.3 UNDERSTANDING THE LAYUP EDITOR ..................................................................................................................................................................14 3.4 PROPERTY CARD: 2D LAMINATE MODELING .........................................................................................................................................................16 3.5 ASSIGNING MATERIAL ANGLES ...........................................................................................................................................................................17 3.5.1 Defining a Material Angle on the Element .......................................................................................................................................18 3.5.2 Defining a Material Angle in the Property Card ...............................................................................................................................19 3.5.3 Advanced Application Example of Assigning Material Angle to a Complex Geometry ....................................................................20 3.6 PROPERTY CARD: 3D LAMINATE MODELING .........................................................................................................................................................24 3.7 MULTI-MATERIAL ANGLE EXAMPLE OF A 3D COMPOSITE MODEL ............................................................................................................................25 4. EXAMPLE 1: CREATING A 2D LAMINATE MODEL IN FEMAP ........................................................................................28 4.1 INTRODUCTION ...............................................................................................................................................................................................28 Predictive Engineering Document, Feel Free to Share With Your Colleagues Page 3 of 66 Predictive Engineering Femap 11.1.2 White Paper 2014 4.2 CREATING THE MATERIAL PROPERTY ...................................................................................................................................................................28 4.3 DEFINING THE LAYUP .......................................................................................................................................................................................29 4.4 DEFINING THE LAMINATE PROPERTY (PCOMP) ....................................................................................................................................................30 4.5 SPECIFYING MATERIAL ANGLES ..........................................................................................................................................................................31 4.6 ANALYSIS SETUP AND POST PROCESSING ..............................................................................................................................................................31 4.6.1 Analysis Set Manager Setup for Composites ....................................................................................................................................33 4.6.2 Post Processing the Results ..............................................................................................................................................................34 5. EXAMPLE 2: CREATING A 3D LAMINATE MODEL IN FEMAP ........................................................................................38 5.1 INTRODUCTION ...............................................................................................................................................................................................38 5.2 CREATING THE MATERIAL PROPERTY ...................................................................................................................................................................39 5.3 DEFINING THE LAYUP .......................................................................................................................................................................................39 5.4 DEFINING THE LAMINATE PROPERTY (PCOMPS) ..................................................................................................................................................39 5.5 SPECIFYING MATERIAL ANGLES ..........................................................................................................................................................................40 5.6 POST PROCESSING THE RESULTS .........................................................................................................................................................................40 6. EXAMPLE 3: MODELING A SANDWICH COMPOSITE ....................................................................................................42 6.1 INTRODUCTION ...............................................................................................................................................................................................42 6.2 CREATING THE MATERIAL PROPERTY ...................................................................................................................................................................42 6.3 DEFINING THE LAYUP .......................................................................................................................................................................................42 6.4 DEFINING THE PROPERTY CARDS ........................................................................................................................................................................42 6.5 POST PROCESSING THE RESULTS .........................................................................................................................................................................43
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