The flexibility of a two-dimensional piping system that is subjected to out-of-plane deformation

✍ Scribed by E. Smith

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 478 KB
• Volume: 38
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(91)90012-p

✦ Synopsis

In the context of the stability of a circumferential through-wall crack in a Type 304 stainless steel piping system that is subjected to accident loading conditions, the paper analyses a simple model that simulates the out-of-plane deformation of a two-dimensional model piping system. The instability criterion is expressed in terms of the material tearing modulus T,, and the applied tearing modulus TApi., the latter being correlated with an effective pipe length parameter L EFF ) which is a measure of the system's elastic flexibility. It is shown that out-of-plane deformation can be associated with higher L,,, values than in-plane deformation, and this has an adverse effect on crack stability. The higher values of L,,, are due to a pipe's higher torsional flexibility, as compared with its bending flexibility.