Typical achievable measurement depths are ~25 mm in steels and ~60 mm in aluminium. The penetration of synchrotron X-ray beams varies from one material to another. The structure of interest should be at least 0.1 mm in all directions and weigh no more than 1 tonne. With synchrotron diffraction, any poly-crystalline material can be measured, but it works best in solids with very fine grains and with minimal texture. To perform this technique, we have access to central nuclear facilities, such as the STFC Rutherford Appleton Laboratory. With synchrotron diffraction, a 3-D map of the full residual stress tensor can be measured with a very high resolution (down to 50 µm), in many cases, non-destructively. We also draw from the expertise of globally renowned researchers from the Materials Engineering Group at the Open University to ensure highly reliable results even in the most complex structures.Īt StressMap, we perform XRD measurements according to residual stress standards and good practice guides. Our highly trained staff can perform measurements in-house or at the client’s site. We have extensive experience in conducting X-ray diffraction measurements for safety-critical applications (e.g. The structure of interest should be at least 0.5 mm thick with a 0.8 × 0.8 mm² surface – with our portable measurement system, we can measure structures of any size above that. With XRD, any poly-crystalline material can be measured, but it works best in solids with small grains and with minimal texture. Where deeper measurements are required, the technique can also be combined with the contour method. Depth profiles can be determined by removing thin layers of material from the surface and measuring the stresses at different depths. In general, the measurement depth is in the order of a few micrometres. ![]() The method is particularly suitable for determining the near-surface in-plane residual stress state. Residual stress measurement by x-ray diffraction (XRD) allows a multitude of points to be non-destructively measured on a solid surface. In addition, The Open University developed SSCANSS, a neutron diffraction experiment simulator that is used in three neutron diffraction facilities worldwide. We also draw from the expertise of globally renowned researchers from the Materials Engineering Group at The Open University, which had a leading role in the development of the neutron scattering instrument at ENGIN-X, ensuring highly reliable results even in the most challenging structures. StressMap staff have extensive experience in conducting neutron diffraction measurements for safety-critical applications (e.g. Where deeper measurements are required, we can also combine neutron diffraction with the contour method. Typical achievable measurement depths are ~40 mm in steels, ~20 mm in nickel, ~50 mm in aluminium. The penetration of neutron beams varies from one material to another. The structure of interest should be at least a few mm in size and weigh no more than 1 tonne. With neutron diffraction, any poly-crystalline material can be measured, but it works best in solids with small grains and with minimal texture. Residual stress measurement with neutron diffraction can provides a 3-D map of the full residual stress tensor with a good resolution, in many cases, non-destructively. Click here to see selected residual stress examples in our projects page. See some selected examples in our projects section. StressMap’s experience with the method over the past 13 years has resulted in significant improvements on the technique and a number of academic publications. We pride ourselves for being the UK centre of excellence for residual stress measurement using the contour method. ![]() The contour method enables residual stress measurements in most conductive materials of virtually any geometry and performs well with a range of part thicknesses from 2 up to 600 mm, while other sample dimensions can be even larger. Such versatility enables the identification of the weakest links in solid structures, the optimisation of material processing routes as well as conducting more accurate lifing and structural integrity assessment. In addition, multiple components of the residual stress tensor can be measured by performing additional contour cuts (see an example) or alternatively, by applying other residual stress measurement techniques (such as X-ray diffraction or incremental centre hole drilling) on the newly created cut surface. With a single residual stress measurement the method can map the stress component acting normal to a cut surface. With the contour method, a high-resolution 2-D map of the residual stress can be determined by conducting a cut at the plane of interest.
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