An Efficient Method for Determining the 'A' and 'B' Design Allowables,
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
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Suggested statistical procedures for obtaining material A and B allowables from both complete and censored samples are outlined in this paper. The allowables represent a value determined from a specified probability of survival with a 95 confidence in the assertion. The survival probabilities are .99 for the A allowables and .90 for the B allowables. Both parametric and non-parametric statistical models are evaluated with respect to their desirability in obtaining the allowables. Exploratory data analysis procedures are introduced in order to determine acceptable distribution functions for representing the data in addition to recognizing outliers bad data or multi-modality. It is demonstrated from a variety of materials test data that allowable determinations require prior application of exploratory data analysis procedures in order to assure acceptable results.
- Laminates and Composite Materials
- Statistics and Probability