Residual stress relaxation and its effect on elastic-plastic fracture stability
This experiment will study how residual stresses influence the initiation and propagation of elastic-plastic fractures. Specifically, we want to determine how the partial relaxation of a residual stress field during elastic-plastic fracture affects the fracture process. Using SALSA, we will produce 3D maps of the elastic strain transverse to a crack in aluminium alloy specimens as they are fractured in the presence of residual stress, and take digital image correlation measurements of total strain at the surface of the specimens. These measurements will indicate how the stress field changes under conditions of stable crack extension and will allow us to validate a generalised analytical model of residual stress relaxation. This work will help to enable more accurate methods of structural integrity assessment, benefitting both the safety and the economics of high-dependability engineering structures including nuclear pressure systems and aerospace components.
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COULES Harry; ABBURI VENKATA Kiranmayi; HORNE Graeme and PIRLING Thilo. (2016). Residual stress relaxation and its effect on elastic-plastic fracture stability. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-02-185
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