maximum strain level below which damage compatible with the sizes established by non-destructive inspection (NDI), special visual inspection, the damage threat assessment, or the minimum sizes imposed does not grow in 106 cycles (108 cycles for rotating hardware) at a load ratio appropriate to the application
NOTE 1 Strain level is the maximum absolute value of strain in a load cycle.
NOTE 2 The damage tolerance threshold strain is a function of the material type and lay-up and is determined from test data in the design environment to the applicable or worst type and orientation of strain and flaw for a particular design and flaw size (e.g. the size determined by the VDT).
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