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4 Correlation with Test Data ANSYS nCode DesignLife includes tools to help combine and correlate test data with simulation results. A wide range of data processing functions enable manipulation, editing and display of measured data. Virtual strain gauges can be positioned on the finite element model, and a stress or strain time series can be extracted, providing a direct correlation to help validate material models. This time series data can also be used for crack growth analysis, employing linear elastic fracture mechanics to predict how a crack will grow after initiation. 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 -0.8 -0.9 -1 Sensitives Sensitives P6 - Geometry Mass P7 - Equivalent Stress Maximum Output Parameters P8 - Life P1 - Ball Diameter P2 - Neck Radius P3 - Shank Length P4 - Fillet Radius P5 - Side Wall Thickness 6 5.5 5 4.5 4 3.5 3 2.5 2 1.5 1 P8 - Life (x10 o ) Response Chart for P8 - Life P2 - Neck Radius 40.5 41 41.5 42 42.5 43 43.5 44 44.5 45 45.5 46 46.5 47 47.5 48 P8 - Life A sensitivity chart demonstrates how input parameters influence output parameters. Using this tool, a user can focus on parameters with the greatest improvement on fatigue life and least impact on product weight. Fatigue life as a function of geometry The optimized hitch has double the fatigue life of the original part.