CMH-17 screening tool
A-basis & B-basis estimator
Enter individual composite test results manually to estimate preliminary one-sided lower basis values.
CMH-17 screening tool
A-basis & B-basis estimator
Estimate one-sided lower basis values from a single set of composite test results.
Preliminary estimate — not a certified allowable
1. Input test data
%
Use results from the same material system, test condition, specimen configuration and direction.
2. Output
Enter at least three valid test values, then calculate the preliminary basis values.
Tensile strength MPa
Normal-distribution screening
B-basis · 90% coverage
—
95% confidence lower bound
A-basis · 99% coverage
—
95% confidence lower bound
Samples
—
Mean
—
Std. deviation
—
COV
—
How to use this calculator
1Prepare one population
Use repeat results from one defined composite material, lay-up, test method and environmental condition. Do not mix batches in this first single-point version.
2Paste the measurements
Enter each measured value in the chosen unit, one per line or as a comma-separated list.
3Review before use
The tool gives normal-distribution screening estimates. Check distribution fit, outliers, batch effects and CMH-17 requirements before using any value for design or qualification.