New Capabilities for Fatigue Life Prediction with ncode

Transcription

1 New Capabilities for Fatigue Life Prediction with ncode Jeff Mentley HBM Prenscia

2 Agenda 3 1. Composites 2. Vibration 3. Welds 4. Additional Enhancements

3 Composites

4 Composite Analysis in ncode DesignLife 12 5 Different to existing Short Fibre analysis Simple safety factor approach based on industry standard static failure criteria (Tsai Wu etc) Applies to unidirectional long fibre and woven composites 13 different failure criteria supported Custom method available Two new glyphs New worked example

5 Composite Static Failure Criteria 6 Currently there is no single agreed static failure criteria for composite materials The Composite Analysis Engine is a sophisticated tool that can analyse a number of different composite static failure criteria, the possible options are: Maximum stress Maximum strain Norris Hoffman Tsai Hill Tsai Wu Franklin Marin Hashin Hashin Rotem Christensen Custom Norris McKinnon (12.1) Hasin Sun (12.1) Modified Nu (12.1)

6 ncode DesignLife 12 New Material Definition 7 New example material in the standard materials database

7 Other Enhancements 9 Support for Digimat multi r ratio analysis based on Haigh curves (12.0) Short fiber with vibration load provider (12.1)

8 Vibration

9 Multiple Simultaneous PSD Loading using Modal Superposition 11 Multiple FRF results can be calculated either from A single modal stress result and multiple modal participation results Multiple modal stress results ( changes in boundary conditions ) More efficient analysis and reduced file sizes

10 Vibration Fatigue from multiple inputs Load PSDs Modal Analysis Harmonic Analysis 12 L 1 PSD L1 Modal Stresses Modal Coordinates Frequency (Hz) L 2 Response PSD PSD L2 Frequency (Hz) PSD A And CSDs Cross Spectra and Phase Frequency (Hz) Rainflow Counting CSD L12 Fatigue Analysis Frequency (Hz)

11 Extending use of the vibration loads 13 Seamwelds for shell elements Stress (12.1) Force/moments (13.0) Spotwelds (13.0) P2P ACM Short fibre composite solver for shell elements (12.1) StrainLife (13.0)

12 Welds

13 Automatic selection of weld type fillet/overlap 15 New seam weld of CombinedFilletOverlap Assessment of angle between weld and sheet Automatic selection between fillet, overlap and combined User control over selection angles

14 Hot spot stress extrapolation for weld analysis from solid elements 16 BSE, IIW, Eurocode require specific structural stress recovery methods Extrapolation of stress on the surface of a solid model Extrapolation distances based on distance or ratio of plate thickness Two or three point extrapolation

15 Other 17 Spotweld modeling with Pentas Vibration load provider with spotwelds Vibration load provider with seamwelds Shells using stress or force/moment

16 Additional Enhancements

17 Gray Iron EN 19 Cast irons are composite materials consisting of a steel matrix and graphite particles. These particles make gray iron stiffer in compression than in tension leading to nonsymmetric cyclic stress strain behavior. To accommodate this the Downing Gray Iron model has been added to the DesignLife EN analysis engine as a standard feature 8new gray iron material sets included in the standard library

18 New FEDisplay Capability 20 Display Types, Methods or Locations in ncode DesignLife results Weld type Fillet, Overlap, etc Calculation method Critical plane, etc Spotweld Location Sheet1, Sheet2, Nugget Shell layer Top, Bottom, Section No. Seamweld location Toe, Root, Throat

19 Custom Analysis engine 21 New Custom Analysis engine in ncode DesignLife Base Opens the system even further for custom stress & strain combination methods and fatigue analysis algorithms. Standard or extractor cycle counter (or none)

20 Speed and Capacity Improvements 22 FE file reading speed efficiencies Save metadata on first open to XML file (.dlmd) Faster access to FE file information when setting up an analysis Fast Dang Van Algorithm Optimised algorithm For most stress states give the same results as the original method With HardeningParameter set to minimum (1e 5) With default hardening parameter setting both methods the optimised method is marginally faster. With the minimum hardening parameter setting the optimised method is >100 time faster.

21 Additional Enhancements in ncode DesignLife Altair OptiStruct H3D File format Altair improvements in H3D file allow more analyses to be supported Material mapping pre run validation New Worked Examples Multiaxial Fatigue Analysis using the Multiaxial EN Analysis Engine Composite Static Failure Analysis using the Composite Analysis Engine ncode DesignLife Custom Analysis Using Auto elimination to Increase Fatigue Analysis Speed Python (13.0)

22 Questions? 24

23 Jeff Mentley Connect with us on: linkedin.com/company/hbm ncode +ncode