Residual stress influences on structural reliability

Structural integrity is affected by residual stresses in a number of ways, some of which are well known to be beneficial in terms of enhancing fatigue performance of engineering components and structures, e.g. surface peening. Knowledge of some of the other more detrimental consequences of residual stresses is more confined within the metallurgical and materials science community and their occurrence during manufacture or service can cause consternation. The purposes of this paper are thus twofold; firstly to introduce several examples of failures which demonstrate more interesting or unusual problems associated with residual stresses and, secondly, to briefly outline the origins of residual stresses and to consider powerful modern ways of measuring residual stress data in real components.

► Review of interesting residual stress-induced cracking problems.
► Synchrotron diffraction residual stress measurement on shot peened turbine blade root.
► Industrial examples of strain age embrittlement and liquid metal assisted cracking.
► Consideration of buckling and distortion arising from residual stresses.