Details of Grant 

EPSRC Reference:	GR/T09781/01
Title:	New approaches to assess fracture under residual stress loading
Principal Investigator:	Sherry, Professor AH
Other Investigators:	Withers, Professor P Marrow, Professor J
Researcher Co-Investigators:
Project Partners:	British Energy Serco
Department:	Materials
Organisation:	University of Manchester, The
Scheme:	Standard Research (Pre-FEC)
Starts:	01 September 2005	Ends:	28 February 2009	Value (£):	206,100
EPSRC Research Topic Classifications:	Materials testing & eng.
EPSRC Industrial Sector Classifications:	Energy
Related Grants:
Panel History:
Summary on Grant Application Form
In many engineering situations, defects reside in regions of high residual stress. The available methods to assess situations dominated by residual stress are conservative, and can be unduly over-conservative in cases such as non stress-relieved welds in ductile metals. This is because they do not take into full account the redistribution of residual stress that accompanies crack propagation. This proposal describes a programme of work to develop and validate new experimental and theoretical approaches for the assessment of cracks in these circumstances. Three key areas are included:1. Experimental approaches including electronic speckle pattern interferometry, image correlation high-energy synchrotron diffraction to measure surface and sub-surface strains to quantify residual stresses and secondary stress intensity factors in preloaded fracture specimens.2. Analytical approaches including the use of an enhanced J-integral to correctly account for the influence of prior strain and material interfaces on crack driving forces3. Modelling methods including the development of the Beremin cleavage model to assess residual stress effects on fracture toughness within defect assessments.This work will establish improved experimental and analytical methods for the assessment of defects located in residual stress fields. The work will extend scientific fracture modelling approaches to include residual stress effects on the fracture..
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Organisation Website:	http://www.man.ac.uk