Advanced science.  Applied technology.


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 9.1 include:

  • Expanded K solution for through crack at edge of plate with symmetric step change in thickness
  • New K solution for displacement-controlled surface crack
  • New K solution for displacement-controlled off-center through crack
  • New K solutions for through cracks in C-section
  • Bending restraint option added to K solution for through crack in L-section
  • Bending restraint option added to K solution for curved through crack at plate edge
  • 2-D data table (DT and KT) models for one or two through cracks (two tips)
  • Revised and expanded cycle counting options
  • Bivariant monotonic shakedown capabilities
  • Polynomial input option for residual stress
  • Residual stress capabilities added to SC04 & SC06 surface cracks in cylinders
  • Several new and revised material property sets in NASFLA
  • New GUI functionality for window and font resizing

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 9.2 include:

  • New NASFAD module for Failure Assessment Diagram calculations
  • New weight function K solutions for surface crack in solid or hollow cylinder
  • New K solution for corner cracks at a row of identical holes
  • New K solution for crack at angled corner
  • Bending restraint option for several edge through crack solutions
  • Partial restraint options for structural section solutions

Plans for future versions include:

  • Additional K solutions for curved through cracks
  • Superposition methods for time-dependent crack growth
  • K solutions for cracks at countersunk holes
  • K solutions for lugs and pin-loaded holes with interference or clearance fit
  • Approximate (compounding) method for multi-site damage
  • Additional K solutions for other unique geometries


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