API-X80 강재 라인파이프의 대변형 비선형 해석 = Large Deformation Inelastic Analysis of API-X80 Steel Linepipes

국문 초록 (Abstract)

본 논문에서는 비선형 유한요소해석 기법을 이용하여 API-X80 강재 라인파이프의 대변형 비선형 거동을 모사하였다. 강재의 구성방정식을 작성하기 위해 GTN(Gurson-Tvergaard-Needleman) 모델을 사용하였다. 대변형 해석을 위해 범용 유한요소해석 프로그램인 ABAQUS과 연계해서 사용할 수 있는 사용자 서브루틴(User Subroutine)의 사용자 재료모델(UMAT)을 개발하였다. 유한요소해석 결과와 일축인장실험의 결과와의 비교를 통해 GTN 모델에서 사용되는 재료모델상수를 도출하였다. 도출된 모델상수를 이용해 API-X80 강재 라인파이프의 소성 좌굴변형해석을 실시하여 실험결과와 비교하였고 소성 좌굴변형에서 발생하는 거동 특성을 성공적으로 모사하였다.

다국어 초록 (Multilingual Abstract)

We simulated large deformation and inelastic behavior of API-X80 steel linepipes using nonlinear finite element method. Gurson-Tvergaard-Needleman(GTN) model is employed for the development of the constitutive model of the steel. The GTN model is implemented in the form of the user-supplied material subroutine(UMAT) for the commercial software of ABAQUS. To calibrate the model parameters, we simulated the behavior of the uniaxial tension test using ABAQUS equipped with the developed GTN model. Using the set of the model parameters, we were able to capture the characteristics of the plastic buckling of API-X80 steel linepipes.

참고문헌 (Reference)

1 정준모, "구조물용 강재의 파단기준에 대한 실험 및 이론 연구" 대한조선학회 45 (45): 157-167, 2008

2 Bordas, S., "Three- dimensional crack initiation, propagation, branching and junction in non-linear materials by an extended meshfree method without asymptotic enrichment" 75 (75): 943-960, 2008

3 Zi, G., "The extended finite element method for dynamic fractures" 12 (12): 9-23, 2005

4 Aravas, N., "On the numerical integration of a class of pressure-dependent plasticity models" 24 : 1395-1416, 1987

5 Rice, J.R., "On the ductile enlargement of voids in triaxial stress fields" 17 (17): 201-217, 1969

6 Zi, G., "New crack-tip elements for XFEM and applications to cohesive cracks" 57 (57): 2221-2240, 2003

7 Zi, G., "Extended meshfree methods without branch enrichment for cohesive cracks" 40 (40): 367-382, 2007

8 Belytschko, T., "Elastic crack growth in finite elements with minimal remeshing" 45 (45): 601-620, 1999

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

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

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

12 서동한, "API-X80/ X100 급 강판과 파이프의 미세조직과 기계적 물성" 12 (12): 20-27, 2007

13 조우연, "API-X80 라인파이프의 좌굴 안정성 평가" 211-216, 2007

14 Rabczuk, T., "A three- dimensional meshfree method for continuous multiple-crack initiation, propagation and junction in statics and dynamics" 40 (40): 473-495, 2007

15 Oh, C.K., "A phenomenological model of ductile fracture for API X65 steel" 49 : 1399-1412, 2007

16 Zi, G., "A method for growing multiple cracks without remeshing and its application to fatigue crack growth" 12 (12): 901-915, 2004

17 Rabczuk, T., "A meshfree method based on the local partition of unity for cohesive cracks" 39 (39): 743-760, 2007

18 Moes, N., "A finite element method for crack growth without remeshing" 46 (46): 131-150, 1999

19 McClitock, F.A., "A criterion for ductile fracture by growth of holes" 35 : 363-371, 1968

20 Acharyya, S., "A complete GTN model for prediction of ductile failure of pipe" 43 (43): 1897-1909, 2008