Me. Fitzpatrick et L. Edwards, FATIGUE-CRACK RESIDUAL-STRESS FIELD-INTERACTIONS AND THEIR IMPLICATIONS FOR DAMAGE-TOLERANT DESIGN, Journal of materials engineering and performance, 7(2), 1998, pp. 190-198
Residual stress fields are now widely accepted to have significant inf
luence on fatigue crack growth. Tensile stresses have detrimental effe
cts on fatigue lives, whereas compressive residual stresses can be ben
eficial, Control of fatigue lives via residual stress is now establish
ed in many industrial applications, using techniques such as shot peen
ing or cold expansion. However, knowledge of the processes that occur
when a fatigue crack grows through a pre-existing stress field is far
from complete, Although the residual stress field will clearly have an
effect on crack growth, the crack will equally have an effect on the
residual stress field, The determination of this effect is not trivial
, and direct measurement may be the designer's best safeguard. This ar
ticle outlines the complementary effects that a growing fatigue creek
and a residual stress field have on each other, Two types of residual
stress field are considered: mechanically induced and thermally induce
d, The results are discussed in terms of the implications that residua
l stress interactions have for damage-tolerant-based design.