Structural Health Monitoring (SHM) of Residual and Applied Stresses Using a Non-Destructive Ultrasonic Technique
- Jacob Kleiman (Structural Integrity Technologies Inc.) | Yuri Kudryavtsev (Structural Integrity Technologies Inc.) | Hiroo Sugihara (Laser Measurement Corporation)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- non-destructive ultrasonic measurement of residual stresses, structural health monitoring, UltraMARS, residual stresses
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- 23 since 2007
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A novel non-destructive method for measurement of residual and applied stresses in many materials is discussed that is based on the acousto-elastic theory of interaction of ultrasound with materials. The measurement of residual stresses using the developed system can be conducted in surface, subsurface layers of materials and average through thickness. Using two different transducer designs, measurements of the RS in the same point through three distinct depth regions of a sample can be obtained, i.e. in surface layers (a few hundred gm in depth), in sub-surface layers (~2 mm in depth) and in bulk, average through thickness (from 2 to 200 mm). Examples of measurements of residuals stresses in marine structural elements and welded samples using the UltraMARS system will be presented and discussed.
Structural health monitoring (SHM) is an important component in prevention of fatigue failures in large structures in many industries like Aerospace, Marine, Civil Engineering, Oil and Gas, Mining to name a few. For fatigue loaded structures, damage means formation and propagation/growth of cracks that in, for instance, welded structures, in most cases, is associated with welding residual stresses. The detection and monitoring of crack propagation is used as a measure of structural health monitoring [O'Brien, E., 2002].
Residual stresses (RS) are playing a very important role in the SHM since they may change considerably the engineering properties of materials and structural components by affecting their fatigue life, distortion, dimensional stability, corrosion resistance, etc. Residual stress management (RSM) therefore becomes a very high priority in many fields of industry and in SHM [Kleiman, J. and Kudryavtsev, Y., 2012; O'Brien, E., 2002]. In RSM engineering approaches, the RS determination, RS analysis and RS beneficial redistribution are considered to achieve the optimum performance of welded structures.
A growing amount of research was conducted in the last decades on use of ultrasound to measure residual stresses in materials in structures. It was demonstrated, through numerous examples of measurements of stresses in bulk and surface layers, that the ultrasound methods can be used conveniently for nondestructively evaluating stresses in different materials, and are particularly suited for measuring stress profiles and repeatable measurements in the same points time over time [Bray, D.E., 2002; Kudryavtsev, Y. et al, 2000-1; Rollins, F. R. Jr. et al, CMJ J. L., 1963; Schneider, E., 2009; Uzun, F. and Bilge, A.N., 2011].
|File Size||1 MB||Number of Pages||6|