Nastran in a Nutshell - CAEfatigue Limited · 2019-05-04 · NASTRAN Analysis Capabilities SOL 400...
Transcript of Nastran in a Nutshell - CAEfatigue Limited · 2019-05-04 · NASTRAN Analysis Capabilities SOL 400...
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MSC.Software Confidential
MSC.Nastran in a Nutshell
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Orientation
• What is my job? – Stress – Dynamics – Loads – Designer – Structural Analyst – Fatigue & Fracture
Product Development Specialist!
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Orientation: What is my job?
• For your given part/product you decide:
Does this product do what it is supposed to do?
– Will it break? – Will it flex too much? – Will it hold together? – Can I make it lighter/
stronger/ better?
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Where does simulation fit in?
• Performance Simulation: How will this part perform? – Will it break? (stress) – Will it flex too much? (deflections) – Will it hold together? (loads) – Can I make it lighter/stronger/better? (optimization)
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Simulation Cans and Can’ts
• Can'ts – What are the stress levels" – Answer “Will it break, yes or no?”"
– How much your part moves"
– Answer “Is this too much (y/n)?”"
– What sort of loads are carried"
– Answer “Will it hold together (y/n)?”"
– How to make it lighter/stronger"
– Answer “Is this the best?”"
Tools cannot make judgments"
• Cans
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What do I need simulation to do?
• Fast, accurate analysis of expected performance • Reliable information upon which to answer the
question:
“Did I make this product perform?”
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Execution: How do I…
• What do I need to do simulation?
Input (raw materials):"– Geometry"– Properties"– Materials"– Loads"– Boundary Conditions"
Output (finished product):"– Displacements"– Stresses"– Strains"– Forces"– Reactions"
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Basic Theory of FEA
• I can’t easily figure out how a complex piece of structure will behave under loading…
– But I CAN figure out how a simple piece of structure will behave…
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Basic Theory of FEA
– Therefore if I put enough of these simple pieces together, I can figure out how a complex piece of structure will behave!!!
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Typical path through FEA
Pre-/Post-
Solver
CAD"
Results"
Input Deck"
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How an Analyst sees FEA (Past)
Solver
CAD"
Pre-/Post-"
Results"
Input Deck"
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NASTRAN Analysis Capabilities
Linear Statics (SOL 101) 0D 1D 2D 3D elements Plane Stress Plane Strain Axisymmetric Composites Substructures Force Pressure Temperature Displacement Force Stress Strain
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NASTRAN Analysis Capabilities
Normal Modes (SOL 103) Natural Frequency Calculation Response Spectra Analysis
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NASTRAN Analysis Capabilities
Linear Buckling (SOL 105) Linear Instabilities Euler Buckling Lateral Buckling Bifurcation
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NASTRAN Analysis Capabilities
Complex Eigenvalue (SOL 107/110) Unsymmetric Matrices Rotor Dynamics Acoustic Analysis Stability
1
2
3
C2K2
K1
m2
m1
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NASTRAN Analysis Capabilities Frequency Response (SOL 108/111) compute structural response to steady-state oscillatory excitation.
rotating machinery unbalanced tires helicopter blades Shaker table simulation
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NASTRAN Analysis Capabilities
Frequency Response (SOL 108/111) Random Analysis Launch Environment Earthquake Loading
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NASTRAN Analysis Capabilities
Transient Response (SOL 109/112) Compute a response to a time-varying input {P(t)}
Acceleration Vs Time
• Car suspension going over a speed bump
• Aircraft landing event
• Drop test
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NASTRAN Analysis Capabilities
Cyclic Symmetry Static (SOL 114) Normal Modes (SOL 115) Buckling (SOL 116) Frequency Response (SOL 118) Cyclic
27x
Symmetry
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NASTRAN Analysis Capabilities
Nonlinear Static (SOL 106) Transient (SOL 129) Implicit (SOL 600)
F
u Displacement
Load
Nonlinear Behavior
Linear Behavior
u
F
σ
ε Strain
Nonlinear Behavior
Linear Behavior Stress
Yield Pt.
PLASTIC
F F
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NASTRAN Analysis Capabilities
Aeroelastics Static (SOL 144) Flutter (SOL 145) Dynamic(SOL 146)
y Spanwise Distance"
Lift"Rigid Wing"
Flexible Wing"
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NASTRAN Analysis Capabilities
Heat Transfer Conduction, Convection, Radiation, Advection Static (SOL 153) Transient (SOL 159)
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NASTRAN Analysis Capabilities Optimization (SOL 200)
tinit toptim
Shapeinit Shapeopt
• Sizing and shape optimization • Automated model updates
• Design variables : – Material properties (E, nu, rho, etc…) – Element properties (I, J, Area, t, etc…) – Connectivity properties (orientation,
mass, etc…) – Grid locations (shape optimization)
• Design constraints and responses : – Stress limit – Frequency – Displacement
• Objective : – Minimize weight – Maximize payload – Minimize Error Function (test/
analysis)
October 7, 2012 This document is the property of MSC.Software : it can not be copied or given to a 3rd party without MSC.Software written agreement .
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Topology optimization
After smoothing
Optimization progression
• Engine mount example
73K Grids 63K Solids 14 Subcases
Objective: Min Compliance Constraint: Fraction Mass Manufacturing: Casting Constraint
October 7, 2012 This document is the property of MSC.Software : it can not be copied or given to a 3rd party without MSC.Software written agreement .
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Topometry optimization Optimized Thickness Distribution
Topography optimization
Conventional Design Topography Design
• Free sizing optimization
• Re-resizing on each element individually and produce a design material distribution over a design region
October 7, 2012 This document is the property of MSC.Software : it can not be copied or given to a 3rd party without MSC.Software written agreement .
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NASTRAN Analysis Capabilities SOL 400
Large RB Kinematics
SOL 129 NL Trans
SOL 400 Implicit
NonLinear
Marc Components
SOL 153 Static Heat
SOL 106 NL Statics
SOL 159 Trans Heat
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What is SOL 400
• Pre-stress, transient event, steady-state residual • Multiple, independent loadcases in 1 run
– Use general 3-D contact capability • Solid-to-solid, surface-to-surface, edge-to-edge
– Go beyond small-strain element limitations • Large strain elements / materials (shells, solids) • CQUADR / CTRIAR nonlinear capabilities
• Advanced Integrated Nonlinear
• MD Architecture enabled • Utilize "native" Nastran
elements • No translation required
• Combine static & transient in one analysis
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What could you do if you…
• Model bolted / riveted joints instead of assuming them?
• Make assemblies with dis-similar meshes? • Could use these assemblies (all) linear analysis?
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Contact in Linear & Nonlinear Solutions
• MD Architecture enabled • Marc contact “service”
– General multi-body 2D & 3D contact
– Deformable & rigid bodies – Touching & Glued contact – Contact with friction
• Glued Contact for Dissimilar meshes
– Faster model building – Reduced “synchronization” effort – Frees meshing specialists to work
on difficult problems
• Full contact (statics)
• Glued contact (all linear solns)
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NASTRAN Analysis Capabilities SOL 700
• SOL700 • Glued and touching contact
• Material plasticity, strain rate dependency, etc
• Transient dynamic solution
07/10/2012
e.g. Heavy falling object
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Bulk Data
Case Control Exec FMS
NASTRAN
GRID ID CP X1 X2 X3 CD
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Input (raw materials):"– Geometry"– Properties"– Materials"– Loads"– Boundary Conditions"
Output (finished product):"– Displacements"– Stresses"– Strains"– Forces"– Reactions"
Thank You !
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Bulk Data
Case Control Exec FMS
NASTRAN
GRID ID CP X1 X2 X3 CD