Abstract
Energy-resolved neutron transmission imaging is used to reconstruct maps of residual strains in drilled and cold-expanded holes in 5-mm and 6.4-mm-thick aluminum plates. The possibility of measuring the positions of Bragg edges in the transmission spectrum in each 55 × 55 µm2 pixel is utilized in the reconstruction of the strain distribution within the entire imaged area of the sample, all from a single measurement. Although the reconstructed strain is averaged through the sample thickness, this technique reveals strain asymmetries within the sample and thus provides information complementary to other well-established non-destructive testing methods.
Highlights
Energy-resolved neutron imaging and its related applications have seen quite substantial progress over recent years due to the development of bright pulsed neutron beamline facilities [1,2,3,4] at neutron spallation sources, as well as recent development in fast neutron counting detectors operating in a time-of-flight mode at high counting rates [5,6]
We investigate the residual strain distribution around drilled and cold-expanded holes within 5-mm and 6.4-mm-thick aluminium plates; these are relevant for the aircraft industry, where the integrity of these holes is very important, as thousands of riveted joints
The measurements were performed at the ENGIN-X neutron beamline [28] at the ISIS spallation neutron source, Rutherford Appleton Laboratory, UK
Summary
Energy-resolved neutron imaging and its related applications have seen quite substantial progress over recent years due to the development of bright pulsed neutron beamline facilities [1,2,3,4] at neutron spallation sources, as well as recent development in fast neutron counting detectors operating in a time-of-flight mode at high counting rates [5,6]. SuchInlaminates during fatigue such treatment defines mechanical of the component and relevant typically addition, consist of thinreliability layers of metal (typically aluminium) bonded layers to several increase the and lifetime of these joints, interspersed are these holes with treated by a cold expansion but reinforcement by special laminates being investigated the in bare of glass fibers. Materials and Methods aluminium plates and plates reinforced with a ~4-mm-thick GLARE laminate consisting of 6 pairs of aluminium/glass fiber layers
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