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The influence of support conditions in the loading fixture on failure mechanisms in the push‐out test: A finite element study
Author(s) -
Harrigan T. P.,
Kareh J.,
Harris W. H.
Publication year - 1990
Publication title -
journal of orthopaedic research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1002/jor.1100080509
Subject(s) - slipping , fixture , finite element method , materials science , test fixture , stress (linguistics) , parametric statistics , structural engineering , ultimate tensile strength , boundary value problem , stress concentration , tensile testing , boundary (topology) , composite material , mechanics , engineering , mathematics , mechanical engineering , physics , mathematical analysis , philosophy , linguistics , statistics
The usefulness of the push‐out test as an indicator of interface strength was evaluated using finite element models of intact and partially failed cylindrical push‐out specimens loaded against a rigid annular support. The irregular stress distributions that were found in intact specimens depended more on interface conditions at the loading fixture than on a 35% increase in interface area. The maximum stress at the interface was a tensile stress. Critical energy release rates for interface failure were calculated for flawed specimens in which flaw size was either 10 or 100 μm, and for boundary conditions at the loading fixture that were either fixed or slipping in the radial direction. The critical energy release rates depended heavily on the support boundary conditions. Thus, the results of parametric push‐out tests can be reasonably compared only for specimens that are very similar in geometry and that are loaded in very carefully controlled fixtures.

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