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Displacement discontinuity method applied to nondestructive testing related stress problems
Author(s) -
Zachary L. W.,
Skillings B. J.
Publication year - 1982
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/nme.1620180809
Subject(s) - discontinuity (linguistics) , boundary element method , nondestructive testing , displacement (psychology) , structural engineering , stress intensity factor , surface (topology) , finite element method , context (archaeology) , stress field , boundary (topology) , displacement field , stress (linguistics) , engineering , geometry , mathematics , mathematical analysis , geology , physics , psychology , linguistics , philosophy , quantum mechanics , psychotherapist , paleontology
A numerical stress analysis technique using the displacement discontinuity method (DDM) is used to evaluate surface breaking and near surface flaws. DDM is described briefly, with the main body of the work devoted to exploring the use of DDM in a nondestructive evaluation (NDE) program. DDM is a subset of boundary element method technique, and it requires that only the boundaries of the problem be described. Two smooth subsurface voids are investigated. Results for two‐dimensional circular and elliptical holes are presented. Comparisons with experimental and theoretical work are shown. The method of uneven element spacing is explored. The results are examined in the context of providing information for NDE inspection requirements and the definition of acceptable flaws. DDM is very well suited for examining the stress field around a surface crack. Surface cracks can be very dangerous and good NDE inspection techniques are required. A method of obtaining the stress intensity factors is developed and illustrated on angular surface breaking cracks. The results are compared with limited experimental and numerical results and interpreted in terms of NDE inspection requirements.