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Recent developments in analysis of crack propagation and fracture of practical materialsPresent U.S. Air Force and proposed U.S. civil airworthiness regulations are based on considerations of 'damage tolerance' in aircraft structures. Airworthiness is assured by demonstrating that damage that escapes one in a sequence of periodic inspections will not grow to critical size before the next inspection. The evaluations conducted employ fracture mechanics analyses. Problems arise because the features of fracture mechanics applications related to aircraft structures are more complex than the cases of fracture mechanics which have been mainly investigated. NASA has, therefore, conducted a variety of research tasks to extend the capabilities of fracture mechanics to deal with some of these complexities. The current stage of development of these capabilities is described. Attention is given to the limitations of linear elastic fracture mechanics, a two-parameter fracture criterion, aspects of fatigue crack propagation, and crack propagation and fracture in built-up structures.
Document ID
19790033526
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Hardrath, H. F.
(NASA Langley Research Center Hampton, VA, United States)
Newman, J. C., Jr.
(NASA Langley Research Center Hampton, VA, United States)
Elber, W.
(NASA Langley Research Center Hampton, VA, United States)
Poe, C. C., Jr.
(NASA Langley Research Center Materials Div., Hampton, Va., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1978
Subject Category
Metallic Materials
Meeting Information
Meeting: Fracture mechanics; Tenth Symposium on Naval Structural Mechanics
Location: Washington, DC
Start Date: September 11, 1978
End Date: September 13, 1978
Accession Number
79A17539
Distribution Limits
Public
Copyright
Other

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