What's New in NASGRO

Capability Growth 

Recent Enhancements

Recent enhancements in the current version 11.1 include:

  • New K solution for a Through Crack in the Web of a T-Section
  • New K solution for a Surface Crack at the Fillet of an L-Section
  • New K solution for a Corner Crack at an L-Section
  • New K solution for an Edge Crack Growing Towards a Hole
  • Expansion of K solution for one curved through crack as one hole in a row of holes
  • Addition of newer weight function (WF) K solutions to the Elastic-Plastic Fracture Mechanics (EPFM) Module
  • Capability to Use API 579 & ASME Paris Equations (1-D and 2-D)
  • Access to material database from the critical crack size module) NASCCS)
  • Expanded availability of K solutions in the NASGLS module
  • Improved crack transition features

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 11.2 include:

  • Superposition methods for time-dependent crack growth
  • Advanced methods for thermomechanical fatigue crack growth
  • Expansion of countersunk hole K solution to include corner crack at faying surface
  • Addition of optional constraint conditions for corner crack K solution in L-section
  • Addition of out-of-plane bending to 2-D WF K solution for a corner crack at a hole
  • Addition of pin load (bearing stress) to through crack and corner crack at offset hole with broken ligament K solutions
  • New K solution for an embedded crack in a round bar

Plans for future versions include:

  • Improve NASGRO installation process
  • Add through-wall crack transition K-solutions for surface cracks in a cylinder and a sphere
  • Add failure assessment diagram (FAD) capability for univariant WF solutions for curved through-thickness cracks
  • Approximate (compounding) method for multi-site damage
  • Ability to call NASGRO directly from another user program
  • More improvements to EPFM module and documentation
  • Additional K solutions for other unique geometries


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