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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

NASFLA

The extensive capabilities of NASFLA, the central life assessment code of NASGRO®, distinguish it from many other fracture mechanics codes. The NASFLA module can be used to perform many different types of fracture mechanics assessments, such as:

  • Computing stress intensity factors for a given crack geometry and loading and display them in tabular or graphical form. More than 78 different geometries are available.

  • Calculating fatigue crack growth rate using the geometry, initial crack size, and loading spectrum, and ultimately determining the number of load blocks or cycles that cause the crack to become unstable. The NASGRO® crack growth equation, the walker equation and tabular data are used for this.

  • Computing the critical initial crack size that will grow to failure when a specified load history is applied.

  • Computing the critical final crack size for which the applied stress intensity factor under a given load is equal to the material fracture toughness.

  • Performing a sustained crack growth analysis to calculate crack growth rate and determine the time that a constant load can be sustained before a glass or glass-like material fails.

NASFLA contains a variety of options for defining fatigue load histories.
 

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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.