The Evaluation of LBB Behavior and Crack Opening Displacement on Statically Indeterminate Piping System Subjected to Monotonic Load.

概要

論文の詳細を見る
The plastic collapse and LBB behavior of statically indeterminate piping system were investigated in this study, compared with statically determinate piping system. Special attention was paid to evaluate the crack opening displacement after a crack penetrated wall thickness. The main results obtained were as follows: (1) The reduction of ultimate strength caused by a crack was relatively small in the statically indeterminate piping system. The main reason is considered that a sufficient redistribution of the bending moment occurs in this system. From this study, it was also known that the statically indeterminate piping system has more safety margin for LBB behavior than the statically determinate piping system. (2) A method to evaluate the crack opening displacement after crack penetration in pipe with a nonpenetrating crack was proposed. From this method, it was known that the crack opening displacement could be evaluated by using the plastic rotation angle. (3) The acceptable defect size considering the deformation of a pipe was estimated by comparing the plastic moment at the defective part and the gross yielding moment at the nondefective section.
一般社団法人日本高圧力技術協会の論文