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Caefem Solution

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CAEFEM Finite element analysis

CAEFEM Finite element analysis

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  • Transcript

    • 1. Concurrent Analysis Corporation
    • 2. Company Profile
      • Established in 1991.
      • CAEFEM was introduced in 1992.
      • Interfaced with FEMAP in 1992.
      • Started developing CAEFEM New Modeler in 2005.
      • Distributed through indirect dealer channel
        • (Packaged as “Sprint II” by CDA Group and “Power Solver” by Aegis Software).
      • Large and established customer base.
    • 3. Overview
      • CAEFEM is a finite element analysis software developed from scratch on Windows platform.
      • Developed in C/C++ languages
      • Offers a complete solution
        • Import of CAD geometry
        • Geometry based loads and boundary conditions
        • Automatic mesh generation
        • High speed analyses of huge models
        • Supports both linear and nonlinear analyses
        • Powerful post processing
    • 4. Object oriented design
      • State of the art event driven object oriented architecture
      • Well documented code.
      • Highly Modular.
      • Developed in C++
      • Highly reliable product.
    • 5. Huge model support
      • Handles models with millions of nodes.
      • 64 bit file addressing to handle huge databases (greater than 2 GB file sizes)
      • Support for 3 GB of addressable memory on 32 bit version.
      • Highly efficient in management of available resources.
    • 6. CAEFEM Modeler
      • User Interface
        • Fully modeless and event driven operation.
          • ability to handle many commands at the same time.
        • Resource file driven
        • Native Windows look and feel (using Qt)
        • Multiple views support for multiple models simultaneously
        • Full, Multi-level undo and redo
        • Dockable tools bars and windows
        • Command tree structure
    • 7. CAEFEM Modeler
      • User Interface
        • Multiple layers with on/off and color trigger.
        • Dynamic highlight and tracking during selection operations
        • Tracking occurs in multiple windows simultaneously
        • Units of measurement displayed in dialog boxes
        • Single dialog box to manipulate individual views and also for post-processing
        • Dynamic working planes for construction. Can be modified in the middle of a command
    • 8. CAEFEM Modeler
      • Graphics
        • OpenGL graphics
        • 3-D dynamic, pan, zoom and rotation in model views
        • 2-D dynamic pan, zoom in graph view
        • Shaded, hidden line and wire-frame display
        • Display of beams and shells with cross sections
        • Support for native Windows printing with customizable image positioning
        • Support for creating image snapshots in jpg, bmp and png formats.
    • 9. CAEFEM Modeler
      • Local languages support
        • Very easy for language localization.
          • Language dependent data is read from external resource files.
        • Both GUI and output files from analysis run share these resource files.
        • Currently CAEFEM analysis is available in Japanese language.
    • 10. CAEFEM Modeler
      • Interfaces
        • Interfaces to major CAD formats like Parasolid and ACIS
        • Interfaces to FEMAP, Nastran bulk data, GLView Post processor and TMG from MAYA heat transfer analysis .
        • API for partners to access CAEFEM database
        • Interfaces to any other products can be developed easily due to object oriented design.
    • 11. CAEFEM Modeler
      • Units of measurement
        • User can import files with different units of measurement.
        • Ability to convert the current system of units to any other system of units for both the model and results of simulation on the fly.
        • User can select combination of any of the supported units.
        • Stefan-Boltzmann constant and acceleration due to gravity are automatically assigned based on the units.
    • 12. CAEFEM Modeler
      • Mesh generation
        • Automatic mesh generation of tetrahedron, shell elements etc., from the CAD geometry.
        • Supports for both parts and assemblies
        • Controls to automatically suppress small features
        • Supports for both linear and parabolic elements
        • Ability to assign different properties to different parts of the model
        • Support for creation and modification of finite element entities with no geometry association
    • 13. CAEFEM Modeler
      • Miscellaneous
        • A comprehensive list of properties and materials
        • Extensive material library
        • User extensible material library support
        • User definable coordinate systems
        • Geometry based loads and constraints
        • Time and temperature dependencies based on user definable functions.
        • Piecewise linear and expressions of functions
    • 14. CAEFEM Modeler
      • Post processing
        • Deformed plots
        • Filled color contour plots
        • Vector plots
        • Single and multi step animation with contours
        • Sections and multiple cutting planes
        • Iso surfaces
        • Bending moment and shear force diagrams
        • Graphs with multiple curves
        • Query of nodal and elemental results
    • 15. CAEFEM Modeler
      • Customization
        • User preference file stores colors, graphics preferences and units
        • User defined material libraries
        • Extensive scripting support using the “tcl” programming language
    • 16. CAEFEM Analyses Types
      • Linear static
      • Natural frequency and Mode shapes
      • Linear buckling
      • Linear transient dynamic
      • Steady state harmonic response
      • Response Spectrum
      • Nonlinear static and transient dynamic
      • Steady state and Transient heat transfer (Linear and nonlinear)
    • 17. CAEFEM Element Library
      • Rod and Cable
      • Bar and Beam
      • Tube
      • Gap and Contact
      • Spring and DOF Spring
      • Mass (nodal), Damping
      • Rigid
      • Stiffness & Mass Matrix
      • Membrane
      • Plane stress
      • Plane strain
      • Plate (Thin and Thick)
      • Laminate
      • Axisymmetric
      • Solid, Tetra and Wedge
      Both Linear and Parabolic element types. Non-structural mass for appropriate elements Multiple topologies such as triangle, quad, tetra, wedge and brick
    • 18. CAEFEM Element Library
      • Truss elements
        • Two node elements supports only tension/compression .
        • Three translational degrees of freedom per node
      • Rod elements
        • It is a truss element with torsional degrees freedom
      • Cable elements
        • Three translational degrees of freedom per node
        • Tension only members
        • Requires a nonlinear analysis
    • 19. CAEFEM Element Library
      • Spring damper elements
        • Axial or rotational springs
        • Axial or rotational dampers
      • DOF Spring damper elements
        • Similar to Spring damper element
        • Stiffness does not depend on the nodal locations
    • 20. CAEFEM Element Library
      • Beam and bar elements
        • Both translational and rotational degrees of freedom
        • Handles tension, compression, bending and torsion
        • Supports shear correction
        • Supports nodal offsets
        • Translational and rotational releases to simulate hinge conditions
        • Unsymmetric cross sections.
        • Tapered cross sections.
        • User specified stress recovery locations
    • 21. CAEFEM Element Library
      • Tube elements
        • Similar to bar elements with circular cross section
      • Plane stress elements
        • Two translational degrees of freedom per node
        • 3 to 6 node triangles and 4 to 8 node quadrilaterals
        • Supports full, reduced and selective reduced integration
        • Supports extra shape functions (bubble functions)
        • Nodal stresses/strains are obtained by the method of least squares from the values at integration points.
    • 22. CAEFEM Element Library
      • Plane strain elements
        • Similar to plane stress elements except strains are limited to the plane of the model.
        • 3 to 6 node triangles and 4 to 8 node quadrilaterals
        • Supports full, reduced integration and bubble functions
      • Axisymmetric elements
        • Useful to model body of revolution
        • Two translational degrees of freedom per node
        • 3 to 6 node triangles and 4 to 8 node quadrilaterals
        • Supports full, reduced integration and bubble functions
    • 23. CAEFEM Element Library
      • Laminate shell elements
        • Supports up to 90 layers (can be extended very easily)
        • 3 to 6 node triangles and 4 to 8 node quadrilaterals
        • Linear elements are based on shell theory, which consists of membrane and bending parts.
        • Parabolic elements are based on Continuum theory
        • Considers shear deformation
        • User specified reference surface
        • Supports both symmetric and non symmetric laminates
    • 24. CAEFEM Element Library
      • Laminate shell elements (contd.)
        • Failure theories : Hill, Hoffman, Tsai-Wu and Max. strain and Interlayer shear failure
        • Calculates stresses and strains at top, bottom and middle surface of each layer.
        • Calculates inter laminar shear stresses
      • Shell elements
        • 3 to 6 node triangles and 4 to 8 node quadrilaterals
        • Linear elements are based on shell theory, which consists of membrane and bending parts.
        • Parabolic elements are based on Continuum theory
    • 25. CAEFEM Element Library
      • Shell elements (contd.,)
        • Supports both thin and thick (shear deformation) elements.
        • Linear elements has 6 degrees of freedom per node
        • Parabolic elements has 5 degrees of freedom per node
        • Supports Honeycomb properties
        • Handles warped quadrilateral elements
        • Stress and strain results in any user coordinate sys.
        • Stress resultants in the element/global coordinate sys.
    • 26. CAEFEM Element Library
      • Solid elements
        • 4 to 10 node tetra elements
        • 6 to 15 node wedge elements
        • 8 to 27 brick elements
        • Full, reduced and selective reduced integrations
        • Extra shape functions (Bubble functions)
    • 27. CAEFEM Element Library
      • Gap elements
        • Supports compression along the gap
        • Coulomb friction along a direction normal to gap
        • Implemented using Penalty method
        • CAEFEM automatically estimates the penalty stiffness
      • Contact elements
        • Supports contact between any types of geometry.
          • Surface to surface contact elements
          • Curve to surface and point to surface
        • Bonded contact between incompatible meshes
        • Element is defined using contact segments
    • 28. CAEFEM Element Library
      • Contact elements (Contd.,)
        • Each segment can be defined using curves, surfaces, or faces of elements
        • Based on penalty method
        • CAEFEM automatically estimates penalty stiffness.
      • Rigid elements
        • Implemented using multi-point constraints
      • Mass elements
        • Nodal mass elements
        • Supports mass and inertia values
        • Supports nodal offsets
    • 29. Loads and Boundary Conditions
      • Body Loads
      • Nodal Loads
        • Force/Moment
        • Displacement
        • Acceleration
        • Temperature
        • Heat Generation
        • Heat Flux
      • Elemental Loads
        • Beam Distributed
        • Pressure
        • Temperature
        • Heat Generation
        • Heat Flux
        • Convection
        • Radiation
      All can be attached to XY-Functions for Time or Temperature Dependence
    • 30. Solution of Equations
      • All analyses support the following solvers
        • Skyline solver
        • Sparse solver
        • Preconditioned Conjugate gradient solver
          • Handles millions of degrees of freedom
      • All solvers support automatic renumbering of nodes to reduce the matrix size
    • 31. Linear Static Analysis
      • Multi load and constraint cases.
        • Hundreds of loads and constraint sets
        • User can select any combinations of load and constraint sets.
      • Isotropic and orthotropic properties
      • Thermal stress calculation
    • 32. Frequency & Buckling Analyses
      • Default eigen value method based on model size.
      • Jacobi, Subspace, Lanczos and Inverse Iterations
      • Calculates modes in the range of interest.
      • Rigid body modes calculation
      • User specified frequency shift
      • Mode participation factors
    • 33. Frequency & Buckling Analyses
      • Sturm sequence check
      • Orthogonality check
      • Lumped, special lumped and consistent mass matrices
      • Stress stiffening
      • Reaction forces, element results
    • 34. Linear Transient Dynamic Analysis
      • Direct time integration.
        • New mark beta method
        • Rayleigh damping
        • Structural damping
        • Spring/Damper element
    • 35. Linear Transient Dynamic Analysis
      • Mode superposition method.
        • Automatic calculation of normal modes.
        • Ability to select all mode extraction options.
        • Rayleigh damping
        • Structural damping
        • Modal damping
          • Damping factor vs mode number
          • Damping factor vs frequency
          • Structural damping vs frequency
          • Quality factor vs frequency
    • 36. Linear Transient Dynamic Analysis
      • Constant initial conditions.
      • Initial conditions can be selected from a load set.
      • Lumped, special lumped and consistent mass matrices
    • 37. Harmonic (frequency) Response
      • Mode superposition method
        • Automatic calculation of normal modes.
        • Ability to select all mode extraction options.
      • Frequency dependent magnitude and phase
      • Rayleigh, Structural and Modal dampings
      • Frequency dependent damping factor, structural damping, quality factor and mode number.
    • 38. Harmonic (frequency) Response
      • Response at user selectable frequencies
      • Manual spacing
        • start end increment
      • Automatic spacing
        • Number of frequencies per mode
        • Frequency band spread (+/-) %
      • Using a function
        • X values specify the required frequencies
    • 39. Response Spectrum
      • Single point excitation
      • Displacement, velocity, acceleration and force spectrums. Also considers rocking spectrum.
      • Base excitation
      • Absolute sum, double sum, grouping, naval research lab and SRSS mode combinations.
      • Supports linear or logarithmic frequency functions
    • 40. Response Spectrum
      • Mode superposition method
        • Automatic calculation of normal modes.
        • Ability to select all mode extraction options.
      • Rayleigh, Structural and Modal dampings
      • Frequency dependent damping factor, structural damping, quality factor and mode number.
    • 41. Damping
      • Viscous damping
        • Spring damper element (for direct integration)
      • Structural damping
        • Rayleigh damping
          • Damping = α M + β K
        • Overall structural damping ( g )
          • Damping = ( g / W3 ) K
            • W3 = Equivalent viscous damping conversion
    • 42. Modal Damping
      • Frequency dependent modal damping
        • Damping factor ζ
        • Structural damping ( 2 * ζ )
        • Quality factor ( 0.5 / ζ )
      • Mode number dependent damping factor
    • 43. Nonlinear Structural Analysis
      • Large Deflections
        • Updated, Total Lagrangian and
          • Co-Rotational formulations
      • Material Nonlinearity
        • von Mises isotropic and kinematic hardenings
        • Bilinear and user specified stress/strain curve
        • Mooney Rivlin hyper-elastic model
        • Drucker Prager and Mohr-Coulomb soil models
      • Contact
        • Gap elements (including friction)
        • Surface to surface contact elements
    • 44. Nonlinear Structural Analysis
      • Regular and modified Newton Raphson
      • Line search for faster convergence
      • Convergence checks on displacements, energy and forces
      • Loads and constraints in any user specified coordinate system
      • Deformation dependent pressure load
    • 45. Automatic time stepping
      • Available for Nonlinear static analysis
      • Starts with a user specified time step
      • Automatically adjusts time step based on the convergence
      • Many options are available to speed up the convergence
    • 46. Large Deflections of Beams
      • Example:
      • A straight cantilever modeled by 5 beam elements with a tip moment
      • It deforms into a complete circle in just 4 time steps
    • 47. Restart of an analysis
      • Restart of the analysis from any previous time or time step.
      • CAEFEM automatically prompts you for a restart if solution exists at the current time.
      • Select ending and incremental times and choose any other required options.
      • If solution at a requested restart time does not exist, CAEFEM automatically interpolates the data.
    • 48. Heat Transfer Analysis
      • Linear and nonlinear (Materially nonlinear or radiation)
      • Automatic detection of nonlinearities
      • Steady state and transient
      • Time and temperature dependent loads and boundary conditions
    • 49. Heat Transfer Analysis
      • Heat flow, heat generation, convection and radiation loads
      • Steady state solution as one of the initial conditions for transient analysis
      • Lumped and consistent heat capacity
    • 50. Heat Transfer Analysis
      • Phase change effects
      • Regular and modified Newton Raphson
      • Line search for faster convergence
      • Euler backward scheme for transient heat transfer
      • Convergence checks on temperature and heat flow
    • 51. Thermal Stress Analysis
      • Automatic transfer of results to structural analyses to find thermal stresses
      • Ability to select temperatures from:
        • Any load set
        • Existing thermal results step
        • Corresponding thermal results step
        • Corresponding thermal results time
        • From a TMG (MAYA heat transfer) results file
    • 52. Bonded Contact Analysis
      • Bonded contact between incompatible meshes
      • Supports all analyses types
        • Linear Statics
        • Frequency and Buckling
        • Linear transient dynamics
        • Steady state harmonic response
        • Response Spectrum
        • Nonlinear statics and dynamics
        • Steady state and transient heat transfer
      Cantilever with incompatible tetrahedral meshes Close up view
    • 53. Results
      • Displacements and Reaction Forces
      • Velocities and Accelerations
      • Temperatures and Heat Flow
      • Stresses and Strains at Nodes and at Element Integration Points
      • Elastic and Plastic Strains at Element Nodes and Integration Points
      • Eigen Values and Mode Shapes
    • 54. CAEFEM Quality Assurance
      • Efficient quality assurance process in place. Verified with many NAEFMS benchmark problems.
      • Completely automatic verification process. It checks many types of results data like displacements, stresses, strains, reactions, at nodes, integration points etc.,
      • Over 1000 internal verification problems.
      • Statistics for solution time and results comparison with other solvers.
      • Batch process to compare the results of these verification problems
    • 55. Disk space management
      • Reduce the amount of information to be written to ASCII output file by selecting Print Options.
      • For multi time step analysis, save information for only those time steps of importance. (in Print Options)
      • Use Start/end/inc format to specify a list of time steps.
    • 56. Case Study (MGM Lion Statue)
      • Analysis of a bronze lion at
      • the entrance to the MGM Grand Hotel
      • Largest bronze statue in the United States
      • 14 meters tall ( 21 meters tall including the pedestal) and 40 000 Kg weight
      • Digitally scanned a small scaled model
      • Converted to STL file and imported into FEMAP for mesh generation
      • Analyzed using CAEFEM
    • 57. Case Study (Daytona Fabcar)
      • The Daytona Prototype built by FABCAR, demonstrated flawless performance during its maiden win in the Nextel Grand Prix of Miami in March 2003.
      • Designed in Solid Edge and analyzed suspension and roll bar using CAEFEM by Fin-el, LLC.
    • 58. Case Study (Cicero Dental Crown)
      • Cicero Dental Systems, Hoorn, Netherlands use CAEFEM to perform the stress analysis of ceramic dental crowns subjected to chewing forces.
    • 59. Bonded Contact Analysis
      • Bonded contact analysis of a pipe attached to a block
      Solid Model Finite Element Model Close up view
    • 60. Solution of a large problem
      • Pentium 4, 2.54GHz , 2GB RAM
      • Nodes: 1,002,288 nodes
      • Elements: 631,327 elements
      • Linear Static Analysis
      • Degrees of freedom: 2,976,792
      • Solution time: 8 minutes
    • 61.
      • Pentium 4, 2.54GHz, 2.0 GB RAM
      • 32 bit version
      • Nodes: 2,734,075
      • Elements: 1,623,284
      • Linear Static Analysis
      • Degrees of freedom: 8,080,935
      • Solution time: 69 minutes
      • Steady state heat transfer analysis
      • Degrees of freedom: 2,734,075
      • Solution time: 23 minutes
      Solution of a large problem
    • 62. Solution of a large problem Section plot
    • 63. Large Frequency Analysis
      • Pentium 4, 2.54GHz, 2GB RAM
      • 32 bit version
      • Nodes: 1,594,735
      • Elements: 939,587
      • Natural frequency and Mode shapes
      • Degrees of freedom: 4,781,745
      • Number of Modes: 8
      • Solution time : 62 minutes
    • 64. Large Thermal Analysis Five million nodes
      • Pentium 4, 2.54GHz, 2.0 GB RAM
      • 32 bit version
      • Nodes: 4,903,028
      • Elements: 3,285,538
      • Steady state heat transfer analysis
      • Solution time: 118 minutes
    • 65. Huge static analysis Thirteen million nodes
      • Intel Xeon CPU 5130 @ 2.0 G Hz, 8.0 GB RAM
      • 64 bit version
      • Nodes: 13, 294, 565
      • Elements: 9, 428, 996
      • DOF: 39, 785, 163
      • Solution time: 3 Hrs 42 Min
      Stress vector plot
    • 66. Huge frequency analysis Two thousand modes
      • Natural frequency analysis of a simply supported plate
      • Intel Xeon CPU 5130 @ 2.0 G Hz, 8.0 GB RAM
      • 64 bit version
      • Number of modes: 2000
      • Error in 2000 th frequency: 5.5 %
      • Solution time: 1 Hr 33 Min
      20 th Mode shape
    • 67. User comments
      • CAEFEM is much faster than the competition.
      • CAEFEM is flexible and very easy to use.
      • CAEFEM handles analyses of huge models very efficiently.
      • CAEFEM is bullet proof.
    • 68. Some of the Future Developments
      • Linux and UNIX versions
      • Solid modeling support
      • Improved support for surface to surface contact elements.
      • Enhanced nonlinear material models.
      • Support for transparency in 3D plots
      • Support for Python and Visual Basic scripting
      • Support for distributed analysis execution with support for parallel computer architectures.
      • Web centric interface for remote monitoring of analysis runs.

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