DTIC ADA221970: Damage Tolerance Analysis for Manned pdf

DTIC ADA221970: Damage Tolerance Analysis for Manned

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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. The accuracy of the procedure was determined by predicing 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 tougness, 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 percent of the test lives for 67 percent of the combined thermomechanical load history tests performed

• Creator/s: Defense Technical Information Center
• Date: 9/1/1989
• Year: 1989
• Book Topics/Themes: DTIC Archive, Harmon, D M, MCDONNELL AIRCRAFT CO ST LOUIS MO, *FRACTURE(MECHANICS), *AIRFRAMES, *THERMAL FATIGUE, *HYPERSONIC VEHICLES, TEST AND EVALUATION, THERMAL PROPERTIES, THERMOMECHANICS, COMPUTER PROGRAMS, FIGHTER AIRCRAFT, METALS, TEMPERATURE, EXPERIMENTAL DATA, DAMAGE, MODELS, HIGH TEMPERATURE, LOADS(FORCES), DAMAGE ASSESSMENT, STRUCTURES, RATES, TEST METHODS, ACCURACY, ADVANCED WEAPONS, MANNED, HYPERSONIC CHARACTERISTICS, YIELD STRENGTH, FATIGUE(MECHANICS), CRACK PROPAGATION, PROFILES, HISTORY, TOLERANCE, AEROSPACE CRAFT

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