I am getting an error: “IOPT = 1 Analysis stopped, parameter ratio value outside K-table domain.” What does that mean?
For some geometries (specifically Cylinders and Spheres), Signal FFS™ uses tabular solutions to determine the K values. These tabular solutions are only valid for certain ratios of a/t, a/c and t/D. The error message indicates that the analysis engine tried to look up a value outside of these boundaries. There are several different reasons that this could occur. 1. A Limiting Flaw Size Evaluation is being performed. In a Limiting Flaw Size Evaluation, Signal FFS™ solves for the failure conditions of a number of different crack size (a/c) ratios. These failure conditions are sometimes out of the bounds of the tabular solution. In this event, the particular data point is left off of the curve and the above error message appears. This message is a warning only. The points on the limiting flaw curve which are returned are all from inside the table boundaries. The message is left as an explanation for why the curve may be unexpectedly truncated. 2. An arbitrary stress distribution (Weight F
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