An Experimental and Finite Element Study of the Ductile Tearing Characteristics of High-Toughness Gas Pipeline Steel

• DOI: 10.4028/www.scientific.net/amm.3-4.259
• Publication Date: 2009-03-16T10:57:14Z
• Authors: S.S. Ayvar; S.H. Hashemi; I.C. Howard; J.R. Yates
• Keywords: Tearing; Experimental data; Bar (unit); Gas Pipeline

This paper reports recent results from a set of experimental and computational studies ductile flat fracture in modern gas pipeline steel. Experimental data plain notched cylindrical tensile bars standard C(T) specimens together with damage mechanics theories have been used to capture the characteristics steel grade X100. The modelling was via finite element analysis using Gurson-Tvergaard modified model (GTN) development. assumption effective material isotropy sufficiently accurate allow transfer predict, 2D model, crack growth behaviour specimen. spite considerable ovalisation at end their deformation. However, it not possible obtain similar accuracy 3D C(T)test, even after large number attempts adjust values GTN parameters. This, anisotropic shape change bars, suggests very strongly that is so conventional models are good enough for full engineering description behaviour. Suitable averaging (of shape) bar data, companion associated provide relatively fast way transferring tests. There discussion potential ways which incorporate effects into those purposes where increase time (due microstructurally-sized elements needed behaviour) acceptable order include through-thickness effects.