Numerical Evaluation of Compressive Strain Capacity for API X100 Line Pipe

다국어 초록 (Multilingual Abstract)

In the strain-based design, pipeline steels are required to satisfy not only the stress capacity but also the strain capacity. Thus,considerable efforts have been made to meet the various requirements of the pipe-material properties that might undergo largedeformation during the installation stage in various hostile environments. An adequate compressive strain capacity can helpeffectively avoid local buckling. Hence, highly deformable steel becomes crucial in achieving the required strain capacity. This studyproposes a nonlinear finite element procedure based on the commercial software ABAQUS combined with the User-definedMaterial Module (UMAT), which is created using Fortran language. The Gurson–Tvergaard–Needleman (GTN) model isimplemented in UMAT to fully consider the nonlinear behavior of an API X100 pipe subjected to compressive loading. Thenumerical simulation results of the full-scale bending test were compared with the experimental results to verify the nonlinear finiteelement procedure equipped with the GTN model. The simulation results are in good agreement with the experimental results. Theparametric studies reveal the effects of geometric imperfections and material properties on the compressive strain limit.

참고문헌 (Reference)

1 Taylor, N., "Submarine pipeline bucklingimperfection studies" 4 (4): 95-323, 1986

2 Kan, W. C., "Strain-based pipelines: design consideration overview" 2008

3 Liu, B., "Strain-based design criteria of pipelines" 22 (22): 884-888, 2009

4 Tsuru, E., "Strain capacity of line pipe with yield point elongation" 2005

5 Liessem, A., "Strain based design-What the contribution of a pipe manufacturer can be" 2007

6 Aravas, N., "On the numerical integration of a class of pressuredependent plasticity models" 24 (24): 1395-1416, 1987

7 Revie, R. W., "Oil and gas pipelines integrity and safety handbook" Wiley 2015

8 Gresnigt, A. M., "Local buckling of UOE and seamless steel pipes" 2001

9 Dorey, A. B., "Initial imperfection models for segments of line pipe" 128 (128): 322-329, 2006

10 Tvergaard, V., "Influence of voids on shear band instabilities under plane strain conditions" 17 (17): 389-407, 1981

11 ASCE, "Guideline for the design of buried steel pipe" 2001

12 Taylor, N., "Experimental and theoretical studies in subsea pipeline buckling" 9 (9): 211-257, 1996

13 Shitamoto, H., "Evaluation of strain limit of compressive buckling by FE analysis" 2007

14 Suzuki, N., "Effects of geometric imperfection on bending capacity of X80 linepipe" 2006

15 Michael, T. C., "Effect of ovality and variable wall thickness on collapse loads in pipe bends subjected to in-plane bending closing moment" 79 : 138-148, 2012

16 Nourpanah, N., "Development of a reference strain approach for assessment of fracture response of reeled pipelines" 77 (77): 2337-2353, 2010

17 Suzuki, N., "Correlative hardening parameters to strain capacity of high strength linepipes" 2008

18 Gurson, A. L., "Continuum theory of ductile rupture by void nucleation and growth: Part-1 Yield criteria and flow rules for porous ductile media" ASME 99 (99): 2-15, 1977

19 Igi, S., "Compressive and tensile strain limit and integrity of X80 high strain pipelines" 2009

20 Suzuki, N., "Compressive Strain Limits of X80 High-Strain Line Pipes" 2007

21 Suzuki, N., "Compressive Strain Limits of High-Strength Linepipes" 2008

22 Franklin, A. G., "Comparison between a quantitative microscope and chemical methods for assessment of non-metallic inclusions" 207 : 181-186, 1969

23 Zimmerman, T., "Buckling resistance of large diameter spiral welded linepipe" 2004

24 Aguirre, F., "Bending of steel tubes with Luders bands" 20 (20): 1199-1225, 2004

25 Tvergaard, V., "Analysis of the cup-cone fracture in a round tensile bar" 32 (32): 157-169, 1984

26 Guarracino, F., "Analysis of testing methods of pipelines for limit state design" 30 (30): 297-304, 2008

27 Veerappan, A. R., "Analysis for flexibility in the ovality and thinning limits of pipe bends" 3 (3): 31-41, 2008

28 Hibbitt, Karlson & Sorensen Inc., "ABAQUS Version 6.4 User's manual" 2005

29 Nourpanah, N., "A design equation for evaluation of strain concentration factor in concrete coated X65 pipelines" 22 (22): 758-769, 2009