Innovative Approaches to Flaw-Tolerant Design and Certification of Airframe Components. Report on NACA Data- Task 6
SBIR Report,01 Nov 2015,01 Nov 2017
ENGINEERING SOFTWARE RESEARCH AND DEVELOPMENT INC SAINT LOUIS MO ST LOUIS United States
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This report presents the results of the work performed with unflawed notched NACA specimens used in connection with Contract No. N68335-10-C-0428 Option 1, Task 1.3. One of the unique aspects of the analytical approach developed in this work is the use of a family of damage accumulation models for ranking in-service damage based on fatigue criticality. The proposed stress-based damage accumulation models, using the integral average of a function of stress over a solution-dependent volume, were tested against available experimental data available in the literature for notched fatigue specimens. This report provides step by step procedures to obtain the reference S-N curve from unnotched specimens of 24S-T3, 75S-T6 and SAE 4130, the calibration procedure to obtain the Beta-HSV curves for each material, and the prediction of fatigue life based on the calibration curve, including the measure of the difference between model prediction and the experimental results.
- Statistics and Probability
- Operations Research