非弾性有限要素解析による円筒－円筒交差部の崩壊特性の研究
スポンサーリンク
概要
- 論文の詳細を見る
It is known that the collapse strength of complex three-dimensional structures cannot be evaluated accurately with elastic analysis, and more accurate results require the use of inelastic analysis. A typical example is cylinder-to-cylinder intersection. In this study, the relationship of collapse loads and local primary membrane stresses of cylinder-to-cylinder intersections was examined. First, elastic analysis on the cylinder-to-cylinder intersections with various combinations of diameter and thickness under internal pressure was conducted. The local primary membrane stress (<I>PL</I>) obtained from the analysis was normalized by the general primary membrane stress (<I>Pm</I>) . The ratio of <I>PL</I>⁄<I>Pm</I> is defined as Stress Intensification Factor (<I>SIF</I>) which was directly influenced by the geometries. Secondly, limit load analysis was conducted on the same structures as elastic analysis and collapse pressure was obtained. The Collapse Strength Reduction Factor (<I>CSRF</I>) defined as the ratio of the run pipe collapse pressure to the cylinder-to-cylinder collapse pressure was proposed. The <I>CSRF</I> was also directly influenced by the geometries. Comparing the results of <I>SIF</I> with <I>CSRF</I>, it is clear that the evaluation by method is overly-conservative and the proposed concept of <I>CSRF</I> method provides more accurate evaluation for the cylinder-to-cylinder intersections. Furthermore, these analysis results can be extended to the reinforced intersections. <I>SIF</I> or <I>CSRF</I> values on the reinforced intersection were predicted from the basic data.
- 一般社団法人 日本高圧力技術協会の論文