MSC Nastran

N is for NonLinear as in SOL400

Shekhar Kanetkar, PhD

AGENDA

What is SOL400 ?

Types of Nonlinearities

Contact

Defining Contact

Moving Rigid Bodies

Friction in Contact

S2S Contact

CASI Solver

Live Demo

AGENDA

What is SOL400 ?

Types of Nonlinearities

Contact

Defining Contact

Moving Rigid Bodies

Friction in Contact

S2S Contact

CASI Solver

Live Demo

What is SOL400 ?

Segment-Segment

Contact (No More

Gaps)

Shell Off-sets

Large

Displacement

MPCs

Faster Solvers Welcome to

SOL 400

Town

Adv. Thermal

Larger than

5% Strain

SOL 129

Town

SOL 106

Town

SOL 106

Nonlinear Statics

SOL 129

Nonlinear Transient

SOL 400

Improvements

3D Contact

Advanced Elements and

Materials

Large rotation RBEs

SUBCASE STEP

HHT Integration Method

Friendly Restart

Rotor Dynamics

Nonlinear Transient

Thermal Load

Temperature Dependent

Composites

Thermal Structural

Coupled

Marc

Advanced Nonlinear

Existing

Nonlinear

New

Capabilities Advanced

Nonlinear + =

What is SOL400 ?

AGENDA

What is SOL400 ?

Types of Nonlinearities

Contact

Defining Contact

Moving Rigid Bodies

Friction in Contact

S2S Contact

CASI Solver

Live Demo

Types of Nonlinearities

Geometric Nonlinearity

Material Nonlinearity

Boundary Condition Nonlinearity - Contact

Geometric Non-Linearity

Large Disp. and Rotations

Large Strain Analyses

Buckling of Structures

Post-buckling behavior Axially Loading Critical Mode

Material Non-Linearity

Plastic: Small and large strain

Hyper-elastic (for Elastomers)

Creep

Visco-elastic

Temperature dependant Properties

Boundary Condition Non-Linearity

Contact - Touching Bodies

- Glued Bodies

AGENDA

What is SOL400 ?

Types of Nonlinearities

Contact

Defining Contact

Moving Rigid Bodies

Friction in Contact

S2S Contact

CASI Solver

Live Demo

Define Contact - The Old Way

USER must align nodes

USER must align CS

USER must define coincident nodes correctly NO NEED

First define the contact bodies

Define Contact - The Better Way

What the Nastran entries look like

List of elements

Define Contact - The Better Way

Contact Table

Define Contact - The Better Way

T T G

AGENDA

What is SOL400 ?

Types of Nonlinearities

Contact

Defining Contact

Moving Rigid Bodies

Friction in Contact

S2S Contact

CASI Solver

Live Demo

Contact - Moving Rigid Bodies

Node 9999

Contact - Moving Rigid Bodies

Node 10000

Node 10001

Ball Bearings (Rigid Bodies) to Freely Move/Rotate

Use Force/Moment Control

Contact - Moving Rigid Bodies

How to Rotate Upper Body ?

Create a Rigid Surface

Glue to Top Mesh (Body)

Two Control Nodes

Apply Disp or Force to those Nodes

Contact - Moving Rigid Bodies

O ye

O ye Hello

You Applied Rotation in

Translation Box

O ye Whats up with that ?

O ye

Its a trick !!!

Node has 3 DOF only

So Use 2 Nodes

1,2,3 DOFs on second Node are

really 4,5,6 DOF on that Rigid Body

AGENDA

What is SOL400 ?

Types of Nonlinearities

Contact

Defining Contact

Moving Rigid Bodies

Friction in Contact

S2S Contact

CASI Solver

Live Demo

Friction in Contact - Setup

Friction in Contact - Setup

Friction in Contact - Setup

Friction in Contact - Setup

In Contact Body ?

OR

So which Friction coeff is used ?

In Contact Table ?

Friction in Contact - Setup

Here is the Rule

1. Contact Table Overrides Contact Body Friction Coeff.

2. If Not Specified in Contact Table

Average of Body 1 and Body 2 for a Pair of Deformable Bodies

Rigid Body Friction Coeff. Is Used for Pair of Rigid Deformable

AGENDA

What is SOL400 ?

Types of Nonlinearities

Contact

Defining Contact

Moving Rigid Bodies

Friction in Contact

S2S Contact

CASI Solver

Live Demo

29

Node to Segment Segment to Segment

Contact S2S

Improved Accuracy

Master-Slave Order Not Important

Contact S2S Set up

AGENDA

What is SOL400 ?

Types of Nonlinearities

Contact

Defining Contact

Moving Rigid Bodies

Friction in Contact

S2S Contact

CASI Solver

Live Demo

Solver Tips Direct vs CASI

CASI Solver

Solid Elements

Not for Shells/Beams/MPCS

Live Demo

Complete Setup of Contact Bodies

MSC Nastran (N for Nonlinear - SOL 400)

Need to Model 3D or Multi-Body Contact

Shells Face to Face, Edge to Edge, Edge to Face Contact

Beam to Beam, Beam to Shell, Beam to Solid Contact

Peeling Glue or Permanent Glue (in Contact)

Strain Level > 10-15%

Elastic-Plastic or Hyper-Elastic Material Properties are Temperature Dependent

Need to Model 3D Solid Composites

Analysis Chaining

Thermal Structural Coupled

Solid Shell (Gradient thorugh Thickness)

Summary