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What’s New in NASGRO®?

 

Capability Growth. NASGRO is always growing and improving. We have a large development team (about ten people at SwRI or NASA) and a large development and support budget (totaling about $2M per year). A new NASGRO production version is released about once each year. Our large user base (thousands of users worldwide) provides suggestions for new features and helps us to identify and resolve bugs. 

Recent Enhancements. Recent enhancements available in the current version 9.0 include:

  • New GUI options for selection of stress intensity factor models
  • New K solution for through crack growing toward a hole
  • New K solution for two collinear through cracks of unequal length
  • New K solution for through crack at edge of plate with one symmetric step change in thickness
  • New bivariant weight function K solution for offset semi-elliptical surface crack at offset hole
  • New K solutions for obliquely loaded tapered lugs with a through or corner crack on long ligament side of hole
  • Added compounding capability to 3- and 4-dof K solutions
  • New failure assessment diagram (FAD) capabilities for bivariant weight function models CC09, SC31, EC04
  • New NASFLA material selection/sorting feature
  • Improved iteration method for inverse calculations
  • New capability to create and import load block filesets for complex spectra
  • New implementation of ESA strip yield model
  • New option to set absolute or relative file paths
  • New material data sets in NASMAT
  • New NASGRO software architecture

A PDF flyer describing the current version can be downloaded here.

Previous Versions. Summaries of new features and enhancements in previous versions are available in the release notes for each version.

Future Development. Major new features planned for version 9.1 include:

  • New K solution for displacement-controlled surface crack
  • New K solution for displacement-controlled off-center through crack in a plate
  • Addition of bending restraint options to K solution for through crack in L-section
  • New K solutions for through cracks in C-section
  • 2D data table (DT and KT) models for one or two through cracks (two tips)
  • Bivariant monotonic shakedown capabilities
  • Polynomial input option for residual stress
  • Revisions to cycle counting options
  • GUI scroll bars and window resizing to accommodate different screen sizes and font sizes
  • New materials data in NASMAT and NASFLA

Plans for future versions include:

  • New NASGRO module for FAD assessment
  • Additional K solutions for lugs and structural sections
  • New weight function K solution for surface crack in round bar or hollow shaft
  • New K solution for curved off-center through crack in a plate
  • Superposition methods for time-dependent crack growth
  • Improved methods for elevated temperature effects on fatigue crack growth
  • Simple method for using Paris equation
  • Approximate (compounding) approach for multi-site damage
  • Additional K solutions for other unique geometries