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KEY TERMS:
NASGRO®
FLAGRO
life assessment
crack growth
fracture
mechanics
damage tolerance
structural integrity
analysis
materials
database
consortium
software
stress intensity
factor
boundary element
method
fracture control
critical crack size
NASA

NASBEM

The NASBEM (NASA Boundary Element Method) module, a two-dimensional boundary element program, calculates stress intensity factors for any two-dimensional geometry and loading, including multiaxial/mixed-mode configurations.

NASBEM can be used to generate tables of stress intensity factors and corresponding crack lengths for use by the NASFLA module in performing life assessments.

NASBEM also calculates stress fields for any collection of points in a two-dimensional uncracked object being modeled, including its boundary.

NASBEM consists of three parts:

  • User-friendly data input interface

  • BEM computational engine containing the stress intensity factor calculation code

  • Post-processing stress analysis code with options for graphical output

The data input interface and stress analysis code were developed at the NASA Johnson Space Center.

The BEM computational engine was provided by researchers at The University of Texas as part of the FADD code (Fracture Analysis by Distributed Dislocations).
 

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Southwest Research Institute® (SwRI®) is an independent, nonprofit, applied engineering and physical sciences research and development organization with 10 technical divisions using multidisciplinary approaches to problem solving. The Institute occupies 1,200 acres and provides nearly two million square feet of laboratories, test facilities, workshops, and offices for more than 2,800 employees who perform contract work for industry and government clients.