Accession Number : ADA207215


Title :   Advanced Durability Analysis. Volume 2. Analytical Predictions, Test Results and Analytical Correlations


Descriptive Note : Final rept. Oct 1984-Feb 1989


Corporate Author : GENERAL DYNAMICS FORT WORTH TX FORT WORTH DIV


Personal Author(s) : Manning, S D ; Yang, J N


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a207215.pdf


Report Date : 27 Feb 1989


Pagination or Media Count : 289


Abstract : Advanced durability analysis design tools have been developed for metallic aircraft structures. These tools can be used to evaluate durability design requirements for functional impairments due to (1) excessive cracking and (2) fuel leakage ligament breakage. The methodology accounts for the initial fatigue quality variation of structural details, the crack growth accumulation for a population of structural details under specified design conditions and structural properties. Step by step procedures are provided. This volume is limited to the analytical methods, technical aspects, concepts and philosophy for the durability analysis of metallic aircraft structures. The methodology reflects a probabilistic approach, a fracture mechanics philosophy and both deterministic and stochastic crack growth methods. It can be used to predict the probability of crack exceedance at any service time and/or the cumulative distribution of the time to reach any crack size. The methodology applies to the small crack size range associated with excessive cracking (e.g., 0.05') and to large through-the-thickness cracks (e.g., 0.5' - 0.75') associated with fuel leakage/ligament breakage. Keywords: Durability, Fatigue, Equivalent initial flaw size, Initial fatigue quality, Crack initiation, Stochastic crack growth.


Descriptors :   *AIRCRAFT , *CRACKING(FRACTURING) , *CRACKS , *CRACK PROPAGATION , *DEFECTS(MATERIALS) , *AIRFRAMES , TEST AND EVALUATION , METALS , METHODOLOGY , THICKNESS , STOCHASTIC PROCESSES , SIZES(DIMENSIONS) , DISTRIBUTION , STRUCTURAL PROPERTIES , PROBABILITY , POPULATION , FRACTURE(MECHANICS) , TIME , VARIATIONS , FUELS , CORRELATION , QUALITY , MATHEMATICAL PREDICTION , FATIGUE , ACCUMULATION , PHILOSOPHY , DETERMINATION , LIGAMENTS


Subject Categories : Aircraft
      Test Facilities, Equipment and Methods
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE