Abstract
AE measurements are presented which were performed at pressure vessel components during different loadings: thermal shocking, hydrotest, cyclic loading. The tests were executed with the IzfP AE system. With this it is possible to locate the AE sources and to identify two source mechanisms: crack growth and crack flank friction. The AE results are discussed and compared with the results of calculations about the residual stress in a cladded vessel wall: • — AE signals originating from crack growth processes are detected very sensitively. • — During thermal shock a lot of crack border friction occurs in consequence of compressive stresses on the crack flanks. • — However, during the hydrotests no crack border friction appears, because the crack flanks are mainly under tensile stresses.
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