MSC.Dytran Product Details

Product Description

MSC.Dytran is a general purpose, explicit finite element analysis program for simulating the nonlinear dynamic response of structures and mechanical components. As an added benefit, MSC.Dytran can also be used to effectively simulate more complex nonlinear analysis problems, such as material flow and coupled fluid-structure interaction. The simulation of this latter class of problems is available as an option to the basic MSC.Dytran structural analysis package.

The technology in MSC.Dytran is based on proven numerical algorithms that have been rigorously tested and verified in many industrial applications. The explicit FEA technology for solving nonlinear structural analysis problems is based primarily on algorithms originally developed at the Lawrence Livermore Laboratory and subsequently enhanced by MSC. This technology has traditionally been used to solve structural analysis problems involving large displacements, nonlinear stress/strain behavior, and contact.

In contrast, the material flow and coupled fluid-structure interaction technology in MSC.Dytran was developed entirely at MSC, and is based on an Eulerian formulation. The foundation for this technology came from MSC's 1990 acquisition of Pisces International and the PISCES software program, originally developed to solve complex fluid-structure interaction problems in the nuclear and defense industries.

Key Features

MSC.Dytran employs classic explicit finite element technology to solve dynamic structural analysis problems. The program includes all of the necessary element types and material models to solve a wide variety of practical engineering problems, including problems involving 3-D contact and sliding effects. Typical applications in this category of problems are structural crashworthiness analysis, component drop test simulation, tri-hub burst containment analysis, and sheet metal stamping.

Element Library

truss element (CROD) beam elements (CBEAM, CBAR) Belytschko-Schwer formulation Hughes-Liu formulation extensive cross section library seat belt element spot weld element quadrilateral shell elements (CQUAD4) Belytschko-Tsay formulation Hughes-Liu formulation Key-Hoff formulation membrane formulation

triangular shell elements (CTRIA3) C0 formulation membrane formulation solid elements (CHEXA, CPENTA, CTETRA) spring/damper elements (CELAS, CDAMP) linear nonlinear corotational user defined concentrated grid point masses (CONM2)

Material Models

Failure Models

maximum effective plastic strain maximum effective stress spalling (tension failure) user defined failure

layered composites failure Tsai-Hill theory Tsai-Wu theory Modified Tsai-Wu theory Maximum Stress theory Chang-Chang theory Hashin theory

Equations of State

• constant bulk modulus
• general polynomial
• ideal gas

Contact

• master-slave contact
  • surface to surface
  • grid points to surface
• single surface contact
• adaptive (eroding) contact
• Coulomb friction
• shell thickness offset and gaps

Rigid Bodies

• analytically defined rigid ellipsoids
• arbitrarily shaped rigid bodies
  • defined via rigid surfaces
  • defined via a rigid material

Constraints

• single point constraints (SPC)
• rigid grid point connections (RBE2)
• rigidly tied surfaces
• rigid wall
• breakable connection between grid points
• kinematic connection between shell and solid element grid points
• mechanical joints to connect rigid bodies

Loading

• concentrated forces and moments
• follower forces and moments
• pressure loads
• gravity loading
• centrifugal force loads
• enforced velocity
• initial conditions
• uniform pressure airbag
• prestress condition from MSC.NASTRAN

User Defined Subroutines

• material failure
• pressure loading
• spring/damper behavior
• velocity constraints
• customized grid point and element output

Occupant Modeling

• fully integrated ATB occupant model
• coupling to MADYMO occupant model

System Requirements

• The Operating System level is as-built. Systems are generally presumed to run on later versions unless specifically stated otherwise. In some instances, later versions are also cited if they warrant special mention.

Vendor Model	Operating System
Compaq (Digital) Alpha	Digital UNIX 4.0
Hewlett-Packard 9000 (7xx, K-Class)	HP-UX 10.20, 11.00
IBM RISC 6000	AIX 4.1.4
Intel	Windows NT 4.0 (SP3)
SGI R4X00/R5000	IRIX 6.2
SGI R10000	IRIX64 6.4, 6.5
Sun SPARC	Solaris 2.5.1