Accession Number:

AD1045203

Title:

Innovative Approaches to Flaw-Tolerant Design and Certification of Airframe Components. Report on NACA Data- Task 6

Descriptive Note:

SBIR Report,01 Nov 2015,01 Nov 2017

Corporate Author:

ENGINEERING SOFTWARE RESEARCH AND DEVELOPMENT INC SAINT LOUIS MO ST LOUIS United States

Personal Author(s):

Report Date:

2017-10-16

Pagination or Media Count:

64.0

Abstract:

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.

Subject Categories:

  • Statistics and Probability
  • Operations Research
  • Aircraft
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE