Accession Number:

ADA222136

Title:

Damage Tolerance Analysis for Manned Hypervelocity Vehicles. Volume 2. Software User's Manual

Descriptive Note:

Final rept. Sep 1986-Sep 1989

Corporate Author:

MCDONNELL AIRCRAFT CO ST LOUIS MO

Personal Author(s):

Report Date:

1989-09-01

Pagination or Media Count:

154.0

Abstract:

The objective of this program was to provide a fracture mechanics based life prediction procedure for hypersonic airframe structures subjected to combined mechanical loadings and thermal profiles. Existing routines were used along with element test data to develop this procedure. Accuracy of the procedure was determined by predicting the crack growth under thermomechanical load histories typical of advanced fighters and aerospace vehicles, and then comparing those predictions with test results. Limitations in the ability of this procedure to predict the test results were used to formulate recommendations for further modeling efforts and research. A fracture mechanics based life prediction procedure was developed for hypersonic airframes subjected to thermomechanical load profiles. The analysis that was developed models crack growth behavior in metals, accounts for the effects of temperature on yield strength and fracture toughness, and includes the effects of sustained loads at elevated temperature on crack growth rate. The analysis was incorporated into a computer routine named DAMAGE. Predictions made with the DAMAGE routine were within 20 of the test lives for 67 of the combined thermomechanical load history tests performed. Keywords Fatigue life Fracture mechanics Service life expectancy Mathematical prediction Thermalmechanical fatigue.

Subject Categories:

  • Research and Experimental Aircraft
  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE