new for fatigue life prediction with ncode · • display types, methods or locations in ncode...

HBM Prenscia: Public

© 2016 HBM

New Capabilities for Fatigue Life Prediction with nCode

Jeff MentleyHBM Prenscia

2016 nCode User Group Meeting

© 2016 HBM October 5-6, 2016 www.ncode.com


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1. Composites2. Vibration3. Welds4. Additional Enhancements

Agenda




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Composites




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• 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

Composite Analysis in nCode DesignLife 12




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• 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)

Composite Static Failure Criteria




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• New example material in the standard materials database

nCode DesignLife 12 ‐ New Material Definition




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• Support for Digimat multi r‐ratio analysis based on Haigh curves (12.0)• Short fiber with vibration load provider (12.1)

Other Enhancements




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Vibration




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• 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

Multiple Simultaneous PSD Loading using Modal Superposition




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Load PSDs

Rainflow Counting

Fatigue Analysis

PSDL1

Frequency (Hz)

PSD L2

Frequency (Hz)

And CSDs

CSD L12

Frequency (Hz)

Cross Spectra and Phase

Response PSD

PSD A

Frequency (Hz)

Vibration Fatigue from multiple inputs

L2

L1ModalStresses

ModalCoordinates

yModalAnalysis y

Harmonic Analysis




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• 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)

Extending use of the vibration loads




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Welds




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

Automatic selection of weld type fillet/overlap




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• 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

Hot spot stress extrapolation for weld analysis from solid elements




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• Spotweld modeling with Pentas• Vibration load provider with spotwelds• Vibration load provider with seamwelds

• Shells using stress or force/moment

Other




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• 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 non‐symmetric 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

• 8 new gray iron material sets included in the standard library

Gray Iron EN




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• 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

New FEDisplay Capability




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• 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)

Custom Analysis engine




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• 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.

Speed and Capacity Improvements




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• 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 2.7.12 (13.0)

Additional Enhancements in nCode DesignLife 12




© 2016 HBM

www.hbmprenscia.com

Jeff Mentley

[email protected]

Email: [email protected]

Connect with us on:

linkedin.com/company/hbm‐ncode | youtube.com/hbmncode | @hbmncode | +nCode



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