NDLI: Improving Prediction of Limit Bending Load for Wall-Thinned Pipes by Reconsidering the Effect of Biaxiality

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Mori, Kosuke Meshii, Toshiyuki
Copyright Year	2015
Abstract	In this paper, a failure criterion applicable to large-strain finite element analysis (FEA) results was studied to predict the limit bending load Mc of the groove shaped wall-thinned pipes, under combined internal pressure and bending load, that experienced cracking. In our previous studies, Meshii and Ito [1] considered cracking of pipes with groove shaped flaw (small axial length δz in Fig. 1) was due to the plastic instability at the wall-thinned section and proposed the Domain Collapse Criterion (DCC). The DCC predicted Mc of cracking for small δz by comparing the von Mises stress σMises with the true tensile strength σB. However, it was indicated that the predictability of Mc was not necessarily sufficient. Thus, in this work, attempts were made to improve the accuracy of Mc prediction with a perspective that multi-axial stress state might affect this plastic instability. As a result of examination of the various failure criteria based on multi-axial stress, it was confirmed that the limit bending load of the groove flawed pipe that experienced cracking could be predicted within 5 % accuracy by applying Hill’s plastic instability onset criterion [2] to the outer surface of the crack penetration section. The accuracy of the predicted limit bending load was improved from DCC’s error of 15% to 5%.
Sponsorship	Pressure Vessels and Piping Division
File Format	PDF
ISBN	9780791856987
DOI	10.1115/PVP2015-45067
Volume Number	Volume 5: High-Pressure Technology; Rudy Scavuzzo Student Paper Competition and 23rd Annual Student Paper Competition; ASME NDE Division
Conference Proceedings	ASME 2015 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2015-07-19
Publisher Place	Boston, Massachusetts, USA
Access Restriction	Subscribed
Subject Keyword	Collapse Cracking (materials) Fracture (process) Errors Finite element analysis Fracture (materials) Pipes Pressure Stress Failure Tensile strength
Content Type	Text
Resource Type	Article

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