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Elastic plastic fracture mechanics methodology for surface cracksThe Elastic Plastic Fracture Mechanics (EPFM) Methodology has evolved significantly in the last several years. Nevertheless, some of these concepts need to be extended further before the whole methodology can be safely applied to structural parts. Specifically, there is a need to include the effect of constraint in the characterization of material resistance to crack growth and also to extend these methods to the case of 3D defects. As a consequence, this project was started as a 36 month research program with the general objective of developing an EPFM methodology to assess the structural reliability of pressure vessels and other parts of interest to NASA containing defects. This report covers a computer modelling algorithm used to simulate the growth of a semi-elliptical surface crack; the presentation of a finite element investigation that compared the theoretical (HRR) stress field to that produced by elastic and elastic-plastic models; and experimental efforts to characterize three dimensional aspects of fracture present in 'two dimensional', or planar configuration specimens.
Document ID
19940006257
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Ernst, Hugo A.
(Georgia Inst. of Tech. Atlanta, GA, United States)
Boatwright, D. W.
(Georgia Inst. of Tech. Atlanta, GA, United States)
Curtin, W. J.
(Georgia Inst. of Tech. Atlanta, GA, United States)
Lambert, D. M.
(Georgia Inst. of Tech. Atlanta, GA, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1993
Subject Category
Structural Mechanics
Report/Patent Number
NASA-CR-194129
NAS 1.26:194129
Accession Number
94N10712
Funding Number(s)
CONTRACT_GRANT: NAG8-243
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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