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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 8.2 include:

  • Improved finite width correction factors for pin-loaded holes
  • New K solutions for through and corner cracks in tapered lugs with oblique loading
  • New K solution for curved through crack at edge of plate
  • New K solutions for corner cracks at rectangular cutouts with rounded corners
  • New K solutions for through crack in structural L-section
  • Improved solution limits and transition criteria for many weight function models
  • Improved graphical user interface for K model display and selection
  • New Ramberg-Osgood stress-strain curve fitting tool
  • Implementation of ASME FFS/API-579 failure assessment diagram (FAD)
  • Additional metric unit options

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 9.0 include:

  • Enhanced tapered lug K solutions for crack on opposite side of hole
  • New K solution for through crack approaching hole
  • New K solution for two unequal collinear through cracks
  • New K solution for through crack in plate with step change in thickness
  • New bivariant K solution for surface crack at offset hole
  • FAD capabilities for bivariant K solutions
  • New materials data in NASMAT and NASFLA
  • Improved functionality for input of complex load histories

Plans for future versions include:

  • Additional K solutions for lugs and structural sections
  • New K solution for displacement-controlled surface crack
  • Bivariant shakedown capabilities
  • Simple method for using Paris equation
  • Superposition methods for time-dependent crack growth
  • Approximate (compounding) approach for multi-site damage
  • Additional K solutions for other unique geometries