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Compressive Surface Strengthening of Brittle Materials by a Residual Stress Distribution
Author(s) -
GREEN DAVID J.
Publication year - 1983
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1983.tb10567.x
Subject(s) - materials science , crack closure , stress intensity factor , residual stress , tempering , brittleness , composite material , residual , crack growth resistance curve , structural engineering , mechanics , fracture mechanics , mathematics , physics , engineering , algorithm
A theoretical approach is presented for predicting the strengthening of brittle materials subjected to a residual stress distribution represented by a polynomial series. In the approach, the stress intensity factor for a surface crack is derived incorporating the effect of crack closure. The crack‐closure distance is then calculated using an approximate approach which allows the strengthening due to the residual stresses to be estimated. Illustrating the approach using residual stresses typical of tempering, it was found the approach agreed well with previous work. The influence of partial crack closure was found to give higher values of the stress intensity factor than would be calculated if the crack were assumed to be open. This effect decreases the amount of strengthening predicted and gives a wide range of conditions for which subcritical crack‐growth processes can occur. For the example of tempering it was also found that these are conditions when weakening or spontaneous failure of the body can occur.