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11 03, 2020

3D Visual Image Correlation

Non-contact strain measurement Digital Image Correlation (DIC) technology provides three-dimensional measurements of shape, global displacement and relative displacement (strain) on the surface an object using an optical method. Generally, DIC systems involve two or more imaging sensors (cameras) to provide sufficient information to for the software to triangulate and track objects in three dimensions. With the help of a randomized speckle pattern applied to the object’s surface, DIC systems can resolve displacements into continuous stress and strain measurements within the area of focus. Some of the main advantages of DIC systems include: Suitable for small- and large-scale objects Capable [...]

22 02, 2020

Effectiveness of Weld Buttering Repair of Externally Loaded Pressure Vessels With Corrosion Damage

Abstract General corrosion damage can significantly reduce the collapse resistance of externally loaded pressure vessels. This is a consequence of the loss of wall thickness and the associated development of high bending and membrane stresses in the corroded area. A common method used to recover wall thickness is weld buttering, whereby weld material is applied to the affected area. This method is convenient and cost-effective compared to other repair options; however, the extent to which weld-induced distortions and residual stresses counteract the reclamation of wall thickness has not been studied. In the current work, the influence of weld buttering [...]

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