Abstract
Multiple site damage (MSD) often occurs during the service of the nuclear pipeline. The typical structure is multiple cracks on circumferential internal surface of the pipeline. In order to evaluate the reliability of the nuclear pipeline and discuss the damage tolerance of the pipeline with multiple cracks, a compounding method for calculating stress intensity factor (SIF) of pipelines with MSD structure is proposed. Compared with the finite element results, the compounding method is accurate and reliable. The SIF of double cracks and triple cracks are studied by using crack spacing as single factor variable. The result shows that the SIF of MSD cracks can be influenced by the crack spacing of the adjacent crack.
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