Hoe kan 3D solid modelling u helpen bij uw stabiliteitsberekeningen? Wanneer zet u beter 3D solids in i.p.v. 2D schaalelementen? Bieden 3D solids een oplossing voor piekspanningen? Bent u benieuwd naar de antwoorden op bovenstaande vragen? Bekijk dan zeker deze presentatie. Deze presentatie werd gegeven tijdens onze infodag met als doel om de deelnemer een overzicht te geven m.b.t. Solid Modelling in onze rekensoftware RFEM voor de berekening van constructies in staal. Praktische voorbeelden werden gedemonstreerd a.h.v. RFEM5 rekensoftware door RFEM Benelux en Dlubal Duitsland.

1. Solids in Dlubal Software
Advanced Options, Examples
and Tipps

2.  Introduction
 Theoretical Background
 Aspects of Modeling
 Examples
 Import from CAD files
Content

3.  Why do we need solids?
Introduction
 Thickness of Material cannot be neglected
 Sometimes we get volumetric models
Convert them to beams and surfaces is
complicated or not possible
 Simulation of Contact
 Subsoil-Simulations
 Models filled with Gas Media
 and more …

4.  Solid Element in RFEM
Theoretical Background
 6 or 3 degrees of freedom
 Derived from a quadratic isoparametric element
 Reduced element with increased numerical
efficiency
 For best results try to have hexahedron shape

5.  Gas Element
Theoretical Background
 For insulated glass analysis
 Follows the gas law
pV =const
with constant temperature
 Requires non-linear analysis
 E.g. used in RF-GLASS

6.  Contact Element
Theoretical Background
 For simulation of contact
 Contact properties for perpendicular
and parallel direction
 Requires non-linear analysis
 E.g. for modeling of connections

7.  Material Models
Theoretical Background
 Six different material models *
 Elastic and Plastic
 Plastic Material Models for solids:
- Isotropic Nonlinear Elastic 2D/3D
- Isotropic Plastic 2D/3D
- Orthotropic Plastic 3D
* Requires RF-MAT NL for plastic material models
If contact elements are involved currently only elastic

8.  Best Practises in Modeling
Aspects of Modeling Solids
 Wire frame -> Surfaces -> Solids
 Extrude from surfaces
 Copy/Rotate with automatic
generation of solids
 Import from Step, Iges, Acis
using RF-LINK

9.  Pipe in pipe
Example 1
 Solid of type contact
 Contact properties

10.  Tension rod connector
Example 2
 Modeling of solids
 Bolt model with compression
only surfaces
 Mesh in layers

11.  Casted Node
Example 3
 Solid material
 High stresses
 Spatial geometry
 Solid made from components

12.  Importing from CAD file
Example 4
 Creating solids
 Free loads
 Stress analysis

13.  Model made from Solids and
Surfaces
Example 5
 Alternative bolt model
 Modeling of welds

14.  Advanced model of bolted
connection
Example 6
 Contact layer
 Bolts and plates as solids

15. Software for Structural Analysis and Design