Rotorcraft Propulsion System

The Challenge

Determine the rate of crack growth and the crack growth trajectory for a flaw located in the root of a gear tooth. Will the crack separate the tooth or continue through the rim causing a catastrophic failure?

The Solution

The crack modeling tools in the BEASY Fracture Workbench allowed engineers to quickly insert and grow cracks in this complicated rotorcraft propulsion system component. Life estimates for safe operation of the gearing system were made using BEASY calculated SIF values and the integrated NASGRO crack growth equation. Comparisons to experimental data were made to validate the computer modeling results.

The Value

The crack growth behavior under a complex rotorcraft load spectrum was quickly assessed and the time to reach a critical flaw size determined. Using this data operational considerations with regard to safe flight usage could be made.

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