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(a) Experimental set-up for collecting maps of the strains in the crack-opening (εyy) and crack growth directions (εzz) using energy dispersive detectors for a compact tension (CT) sample; (b) crack-tip stress field determined at the centre of a 12 mm thick CT test piece by synchrotron X-ray diffraction at KI,max (13.2 MPa√ m) for an ultrafine grained (<1 μm) AA5091 Al alloy [22]. A 25×25 μm gauge cross-section was used. (Online version in colour.)
