Methodology and Tools for Virtual Prototyping: Finite ... Confidential Methodology and Tools for Virtual…

  • Published on
    10-Jun-2018

  • View
    212

  • Download
    0

Transcript

  • MSC Confidential

    Methodology and Tools for Virtual Prototyping:

    Finite Element Analysis (Structural, Thermal,

    Mechanical, Coupled)

    Nastran/Marc

    Daniele Catelani

    Senior Project Manager MSC Software

  • MSC Confidential

    6/16/2015 2

    FEM Structure representation

    Real behavior of structures is

    extremely complex

    Mathematical Representation has

    to take into account:

    Geometry

    Structure charachteristic

    Material

    Constraints

    Load

    Analysis to perform

    Output to get

    ...

    Some representation is needed to

    allow study

    ?

  • MSC Confidential

    FINITE ELEMENTS

    A finite element model of a component or system is a

    mathematical representation of it using small, but finite

    sized, simply shaped, connected entities ( i.e. line, surface,

    solid) called finite elements.

    Component (Geometric Model) Tetrahedral Mesh of Geometry

  • MSC Confidential

    FINITE ELEMENTS

    Finite elements come in different shapes and forms

    Linear and parabolic elements

    Bar Tri

    Tet HexWedge

    Quad

  • MSC Confidential

    6/16/2015 5

    Displacement method

    Every subdomain is represented by stiffness matrix, depending on

    element type and characteristic

    For each element the following equation is evaluated

    { P }e = [ k ]e { u }e{ P }e = applied external forces

    [ k ]e = element stiffness matrix, in which the term kij represents force on the j dof when i dof disp = 1.0 ( kij= kji )

    { u }e = disp vector of element nodes

    STRUCURE { P }e = [ k ]e { u }e { P } = [ k ] { u }

    FEM introduction

    ASSEMBLY

  • MSC Confidential

    6/16/2015 6

    FEM introductionHow to choose the structural element

    Depending on geometry

    Geometrical dimension ratio

    1D Lateral Dimensions are negligible wrt Longitudinal

    2D two dimensions are greater

    3D No dimension is greatest

    Undeformed configuration

    }

    Modello realizzato con elementi tridimensionali

    Solu

    tio

    n 1

    Solu

    tio

    n 2

    Analysis goal influences element choice

    1D element; properties have to simulate right behavior

    Lumped mass for wheels

    Lumped mass for representing inertia distribution

    Simplified model

  • MSC Confidential

    6/16/2015 7

    FEM introduction

    element library MSC Nastran

  • MSC Confidential

    6/16/2015 8

    FEM introductionMaterial

    Elastic or non elastic

    Plastic deformation = residual deformation

    Temperature effects

    Deformation ratio effect

    Hardening effect

    e

    s T2T1

    e2

    e3

    Superficie di

    snervamento

    iniziale

    Superficie di snervamento

    dopo la deformazione plastica

    O

    Lincremento di carico

    aumenta le dimensioni

    della superficie di

    snervamento

    e1

    e2

    e3

    O

    e1

    O

    Superficie di

    snervamento

    iniziale

    Superficie di snervamento

    dopo la deformazione plastica

    Lincremento di carico sposta la

    superficie di snervamento senza

    aumentarne le dimensioni

    INCRUDIMENTO ISOTROPOINCRUDIMENTO CINEMATICO

    e

    s

    e

    t (time)

    e0

    t1

    Creep Recovery

  • MSC Confidential

    6/16/2015 9

    Elasto-Plastic : (MATEP)

    Temperature dependence : (MATORT), (MATTEMP)

    Failure : (MATF)

    ( Hill, Tsai-Hu, Hoffmann, Puck, Hashin, Hashin Tape and Fabric,...)

    Progressive failure analysis

    Gasket : Nonlinear elastic and elasto-plastic (MATG)

    Cohesive : (MCOHE)

    Orthotropic Nonlinear Elasticity

    (MATORT/MATSORT)

    Anisotropic Plasticity (MATEP with aniso option

    Hill and Barlats models)

    FEM introductionMaterial library MSC Nastran

  • MSC Confidential

    6/16/2015 10

    Pressure dependent plasticity (MATEP - Mohr-Coulomb and Drucker-Prager)

    Shape memory (MATSMA)

    Other: (MATEP ,MATVE,MATVP)

    Creep (MATVP - Maxwell and Kevin models)

    Elastomers (MATHE - Mooney, Ogden, Arruda-Boyce

    and Gent models)

    SOL 400 Nonlinear Material Implementation Marc material models in the standard Nastran elements (Cont.)

  • MSC Confidential

    6/16/2015 11

    Tipi di carichi Schede di input MD NASTRAN Forze applicate direttamente ai nodi Momenti applicati direttamente ai nodi

    FORCE, FORCE1, FORCE2 MOMENT, MOMENT1, MOMENT2

    Carichi sugli elementi 1D Carichi di pressione e trazione su elementi 2D e 3D

    PLOAD1 PLOAD, PLOAD2, PLOAD4, PLOADX

    Carichi di accelerazione traslazionale (Gravit,..) Carichi derivanti da diversi campi di accelerazione Carichi dovuti a force centripete e/o accelerazioni angolari

    GRAV ACCEL, ACCEL1 RFORCE

    Carichi termici TEMP, TEMPD, TEMPP1, TEMPRB (+ Coefficiente di espansione termica)

    Deformazioni assiali su elementi 1D DEFORM

    Spostamenti imposti ai nodi (cedimenti vincolari..) SPC, SPCD

    Combinazione lineare dei carichi LOAD

    FEM introductionLoads /Constraints/Contacts

    Touching Contact Permanent- Glue Contact

  • MSC Confidential

    6/16/2015 12

    FEM introductionThermal Case with Permanent Glued

  • MSC Confidential

    6/16/2015 13

    Linear Static

    Modal

    Buckling

    Frequency response

    Transient response

    FEM analysis

    MODAL ANALYSIS

    Detailed FEM

  • MSC Confidential

    6/16/2015 14

    FEM analysis

    Damped modes

    Random

    Response Shock Spectrum

    Aeroelasticity (Static, Flutter, Transient)

    Nonlinear Static

    Nonlinear transient

    Strucural optimization (Properties, Material, Shape, Topology, Topometry, Topography)

    Superelements

  • MSC Confidential

    WORKFLOW IN Patran

    The Main Menu

    2 - Import Geometry

    1 - Select Analysis Code

    2 - or Build

    Geometry3 Create

    Analysis Model

    5 - Evaluate and Publish

    Analysis Results

    4 - Perform the

    Analysis

  • MSC Confidential

    6/16/2015 16

    ../../../disco3/msc50/presentazioni/may23/THALESALENIASPACE_LANUTI/Pres_MSC_EFAM_2013.05.20_01_Video.ppt../../../disco3/msc50/presentazioni/may23/THALESALENIASPACE_LANUTI/Pres_MSC_EFAM_2013.05.20_01_Video.ppt

  • MSC Confidential

    6/16/2015 17

    ../../../disco3/msc50/presentazioni/may23/AVIO/presentazione_MSC_mod.pptx../../../disco3/msc50/presentazioni/may23/AVIO/presentazione_MSC_mod.pptx

  • MSC Confidential

    6/16/2015 18

    ../../../disco3/Evento_Roma_2006/2Days_sessions/30Nov/Technical_session/uniroma/UniRoma.ppt../../../disco3/Evento_Roma_2006/2Days_sessions/30Nov/Technical_session/uniroma/UniRoma.ppt

  • MSC Confidential

    6/16/2015 19

    ../../../disco3/UC_Napoli_2014/presentazioni/DAY1/Avio/AVIO_Presentazione_Separazione.pptx../../../disco3/UC_Napoli_2014/presentazioni/DAY1/Avio/AVIO_Presentazione_Separazione.pptx

  • MSC Confidential

    6/16/2015 20

    ../../../disco3/UC_Napoli_2014/presentazioni/DAY1/ThalesAleniaSpace/A new approach in clampband design.pptx../../../disco3/UC_Napoli_2014/presentazioni/DAY1/ThalesAleniaSpace/A new approach in clampband design.pptx

  • MSC Confidential

    6/16/2015 21

    ../../../disco3/UC_Napoli_2014/presentazioni/DAY2/OMPM/CCR MOUNTING RING THERMAL ANALYSIS WITH SOL400_10_1_2014.pptx../../../disco3/UC_Napoli_2014/presentazioni/DAY2/OMPM/CCR MOUNTING RING THERMAL ANALYSIS WITH SOL400_10_1_2014.pptx