Linear Elastic Fracture Mechanics

Lambda uses linear elastic fracture mechanics (LEFM) to predict the fatigue crack growth behavior of structures with a variety of damage and loading geometries. LEFM is routinely used to understand crack growth behavior under complex load history and residual stress distributions from processes such as LPB® and shot peening.

How does it work?

LEFM is based on the analysis of crack growth in linear elastic materials. It provides a tool for determining the life expectancy of structures and components. Based on linear elasticity theory, the stress intensity factor and the stress field near the crack tip can be calculated for a specific component. By comparing the total stress (calculated applied and measured residual) to the fracture toughness of the material, the onset of crack propagation can be determined. Lambda uses LEFM in combination with the residual stresses measured by our lab to determine the effect of residual stress on fatigue theoretically.  

LEFM Features:

  • Combines finite element applied stresses with measured residual stresses for life prediction
  • Allows for quick understanding and comparison of beneficial compressive residual stress fields
  • LEFM predictions are validated with component fatigue testing
Linear Elastic Frac Mech image

Linear Elastic Fracture Mechanics LEFM provides our customers with powerful solutions to mitigate many damage mechanisms.

Questions about how Lambda can use LEFM to extend the life of your parts?

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