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Modeling and Analysis of Part Connections with PERMAS

View presentation about self loosening of bolts
For the computation of complex assemblies part connection modelling plays an important role. The comfortable handling and a good physical representation are conflicting goals, to be addressed by the features available in PERMAS. Comfortable functions that are configurable by parameters are offered.
Benefits and particular strengths
Increase in productivity in FE modeling through adequate methods for part connections. The following advantages and strengths should be emphasized:
  • The right method for every part connection (we will be happy to show you the advantages: info@intes.de),
  • Incompatible coupling for mesh-independent modeling of complex components,
  • High-performance contact analysis for accurate results even with very large models,
  • The right method for screw pretensioning for every level of detail,
  • Press fits as a linear method with many advantages,
  • high accuracy for thread contact, which allows calculation of screw loosening,
  • Modeling of spot weld joints.
Part Coupling
incompatible_outer_race
Incompatible coupling outer race of ball
bearing to free mesh of another part
Component couplings via incompatible couplings enable efficient modelling. This coupling method for surfaces and edges has a long tradition in PERMAS. Due to its high accuracy and many options, this method can be used anywhere.
  • The most important points about the incompatible coupling:
    • Raising productivity in finite element modelling,
    • mesh-independent modelling,
    • faster exchange of parts by keeping other already meshed parts unchanged,
    • more flexible modelling by partoriented meshing,
    • improved mesh quality by accurate mesh transitions,
    • suitable for large rotations by considering the distances,
    • global or local directions can be coupled.
Contact
wire_mesh
Wire mesh
wire_npstress
Stresses during large displacement
Contact analysis with PERMAS
Static deformations are calculated under various loads with linear and nonlinear material behavior:
  • Contact analysis:
    • many contacts possible (>>30,000),
    • unrivaled short run times,
    • most advanced solver technology,
    • friction can be taken into account with transitions between sticking and sliding,
    • bolt conditions can be applied in one step,
    • specification of a realistic loading history,
    • contact results: contact pressure, contact status, contact forces, saturation, etc.
Bolts
pretension_variants
Different bolt pretension methods
bolts_friction_force
Frictional forces at bolts during driving
For the modeling of bolts, especially the preload, the appropriate methods are available in PERMAS for every level of detail.
The procedures range from modeling with beams, with exact prestension forces, to detailed thread modeling in order to carry out evaluations directly on the screw.
Advanced methods simplify input via parameters and lead to efficient modeling with high accuracy.
In addition to the non-linear methods, there are even linear formulations for the prestress in order to take them into account in purely linear calculations.
Bolt loosening
rim_model
Rim with bolts
bolts_friction_force
Frictional forces at bolts during driving
The simulation of bolt loosening is very demanding. The diverse requirements, high accuracy, parameterized input, simple modelling, different levels of detail and short computing times can be solved excellently by PERMAS. We are happy to share further details: info@intes.de
Model set-up
Shear loading of bolt.
Rotation of bolt head
Self-loosening of bolt head.
Contact pressure
Contact pressure under the bolt head and in the thread.
Pressfit
pressfit
Results pressfit
There is a separate definition for pressfit which takes special requirements into account. Further information follows. If you need further information directly, we look forward to hearing from you: info@intes.de
Welding
weld joint
Weld joint region
The simulation of welt joints is simple and accurate in PERMAS. We are happy to share further details: info@intes.de
Questions? Ask us!

INTES Ingenieurgesellschaft für technische Software mbH
Management:  Rolf Fischer
Breitwiesenstr. 28
70565 Stuttgart
Germany
Commercial register:  Stuttgart HRB 10 978
VAT registration number: DE 147803245
Tel.: +49 711 78499-0
✉info@intes.de

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