In general, these models are empirical or phenomenological and contain parameters that must be determined using constant, and in some cases variable, amplitude fatigue data for the material system in question.
In response to queries about the constitutive model used and sources of data for the material constants of the model, such statements as "… I don't know much about this area so I asked my buddy down the hall to give me some numbers" are music to the ears of litigators investigating disasters that involved computational efforts.
The test data for the material showing no fatigue limit on a log log (not a semi-log) paper results in a straight line plot, but for the materials showing fatigue limit the data plot is an asymptote to the fatigue limit for any of the probabilities of failure.
The evaluated data for these materials in the existing nuclear data libraries — ENDF/B-VII.1, JEFF-3.1, JENDL-4.0, CENDL-3.1, ROSFOND, IRDFF 1.0 — are reviewed, discrepancies are identified, and some integral properties are given.
The numerical data for the five materials observed in the present study are listed in Table 1.
An overview of this process, together with characterization data for the resulting materials, is presented.
The finite element models of tooth cement core veneer structures are complex and require accurate data for the different materials in order to be correct, data which are not readily available at present.
Because our QC plan specified that Hg results for reference materials that exceeded ±10% of the nominal Hg mean concentration (adjusted for the moisture content) would be used to normalize the data from samples obtained during the same measurement session, raw data for the reference materials (primarily Albacore Tuna, NBS RM 50) do not reflect the accuracy for the samples.
