r5.06.03 Shock and friction modeling in transient analysis by modal recombination

Summary:

This document describes the physical laws of contact with friction between structures and the modeling that is made of them in the transient analysis algorithm by modal recombination DYNA_VIBRA (TYPE_CALCUL =” TRAN “and BASE_CALCUL =” GENE”) with COMPORTEMENT =” DIS_CHOC “. For the various nonlinear contact connections that can be used, the calculation of the quantities defining the contact conditions is detailed.

The usage patterns used are described in [R5.06.04].

Table of Contents

• 1. Introduction
• 2. Contact relationships between two structures
  • 2.1. Unilateral contact relationship
  • 2.2. Coulomb’s law of friction
• 3. Modeling of touch/friction by penalization
  • 3.1. Normal contact force model
  • 3.2. Tangential contact force model
• 4. Types of modelled contact connections
  • 4.1. Connections between a node and an undeformable obstacle
  • 4.2. Connections between two nodes of two deformable structures
• 5. Use of localized nonlinear shock and friction forces in modal recombination
• 6. Clarification on the use of frictional shock nonlinearities
  • 6.1. Definition of the shock bond type
  • 6.2. Definition of the local coordinate system for contact conditions
  • 6.3. Define link nodes
  • 6.4. Definition of the characteristic dimensions of sections
  • 6.5. Define contact parameters
  • 6.6. Use of unidirectional shock