study on fracture toughness and fatigue crack growth rate of x80 pipeline steel
DESCRIPTION
Study on fracture toughness and fatigue crack growth rate of X80 pipeline steel. Reporter: Luo Li Advisor: Xu Chen. 4. Introduction. 目录. References. COD gage. 4. The plan. 总体概况. Introduction. 目录. References. Introduction. COD gage. 4. The plan. 调研方法. Introduction. 调研方法. - PowerPoint PPT PresentationTRANSCRIPT
4
Study on fracture toughness and fatigue crack growth rate of X80 pipeline steel
Reporter: Luo Li
Advisor: Xu Chen
4
Introduction
References
COD gage
目录
4
The plan
Introduction
References
COD gage
目录
总体概况
The plan
4
Introduction
调研方法
Introduction
调研方法
Introduction
X65
X70
X80X100
X120
Introduction
References
MicrostructuralMicrostructural
Crack closureCrack closurePre-strainPre-strain
CriterionCriterionLBBLBB
FADFAD
[1] S.Y. Shin, B. Hwang, S. Kin, S. Lee. Fracture toughness analysis in transition
temperature region of API X70 pipeline steels[J]. Materials Science and
Engineering : A , 2006,429(15):196~204
[2] S.Y. Shin, B. Hwang, S. Kin, S. Lee. Correlation of microstructure and charpy
impact properties in API X70 and X80 line-pipe steels[J]. Materials Science and
Engineering : A , 2007,458:281~289
[3] 赵亚娟 . 针状铁素体型管线钢的显微组织分析 [J]. 南钢科技与管理 , 2007,
(4):7~9
GBF PF
MA
P
References
MicrostructuralMicrostructural
Crack closureCrack closurePre-strainPre-strain
CriterionCriterionLBBLBB
FADFAD
References
References
[1] Cosham, A., Palmer, A., and Hopkins, P., 2003, “An experimental Study of the Effect of Pre-strain on the Fracture Toughness of Line Pipe Steel,” in Proceedings of the 10th International Conference on Pressure Vessel Technology (ICPVT-10), Vienna, Austria, p. 357
[2] Cosham, A., 2001, “A Model of Pre-Strain Effects on Fracture Toughness,” ASME J. Offshore Mech. Arct. Eng., 123, pp. 182–190.
[3] Cosham, A., Hagiwara, N., Fukuda, N., and Masuda, T., 2002, “A Model to Predict the Effect of Pre-strain on the Fracture Toughness of Line Pipe Steel,” in Proceedings of the 4th International Pipeline Conference (IPC 2002), Calgary, Alberta, Canada, ASME, IPC02–27324, B, pp. 1965–1978.
Pre-strain Negative effect
MicrostructuralMicrostructural
Crack closureCrack closurePre-strainPre-strain
CriterionCriterionLBBLBB
FADFAD
References
References
[1] K. Shinobu, H. Naoto, M. Tomoki. Evaluation of Leak-Before-Break (LBB) Behavior For axially Notched X65 and X80 Line Pipes[J]. Journal of Offshore Mechanics and Arctic Engineering, NOVEMBER 2004, 126:350~357
[2] K. Shinobu, H. Naoto, M. Tomoki. Experimental Evaluation of Leak-Before-Break (LBB) Behavior for High-Grade Line Pipes With an Axial Through-Wall Flaw. 21st International Conference on Offshore Mechanics and Arctic Engineering. OMAE2002-28204 pp. 173-180
MicrostructuralMicrostructural
Crack closureCrack closurePre-strainPre-strain
CriterionCriterionLBBLBB
FADFAD
References
References
[1] M.Hadj Melian, Z. zari, G. pluvinage. Gouge assessment for pipes and
associated transferability problem[J]. Engineering Failure Analysis,
2010,17(5):1117~1126
[2] S. Cicero, V. Madrazo. Assessment of notched structural components
using Failure Assessment Diagrams and the Theory of Critical Distances[J].
Engineering Fracture Mechanics, 2011,78(16):2809~2825
FAD: Failure Assessment Diagram
MicrostructuralMicrostructural
Crack closureCrack closurePre-strainPre-strain
CriterionCriterionLBBLBB
FADFAD
References
References
[1] GB/T 21143-2007 Metallic materials-Unified method of test for
determination of quasistatic fracture toughness
[2] GB/T 6398-2000 Metallic materials-fatigue crack growth rate tests
[3] ASTM MNL27 28-027096-30 Elastic-Plastic fracture : Laboratory
test procedures
[1] Y.P. Kim, C.M. Kim. Near- threshold Fatigue Crack Growth
Behavior and Crack Closure of Natural Gas Pipeline Steels[J].
Procedia Engineering, 2011,10:813~820
The crack closure phenomenon of the X80 steel in the
low ΔK region is roughness-induced.
建议总结 Proposals
References
COD gage
COD gage
Calibration Setting mm
Calculatedmm
Deviation%
0.1 0.1042 4.2
0.2 0.2056 2.8
0.4 0.4072 1.8
0.6 0.6102 1.7
0.8 0.8116 1.45
1.0 1.0115 1.15
1.2 1.2120 1
1.4 1.4080 0.57
1.5 1.5112 0.75
Scale=2.43
COD gageThe plan
Date Detail
2012.8-2012.11 Read papers. Design COD gage.
2012.11-2013.1 Fracture toughness tests
2013.1-2013.2 Fatigue growth rate tests
2013.3-2013.6 Post-processing and fatigue tests
2013.7-2014.1 Undetermined
2014.2-2014.5 Finish the paper
The plan
Uniaxial tensile Test
Experimental No.
T-H1 T-Z1
Temperature ℃
room temperature
room temperature
Strain rate s-1 0.001 0.001
Under displacement control
The plan
Fracture ToughnessTest Under displacement control at room temperature
Pre-crack TestLoad ratioR
Crack growthΔa(mm)
The max load Fmax (N)
Loading rate mm/min
The loadF (N)
0.1 1.5~3 Calculated 0.3 Calculated
Experimental No. ContentF-H1 F-Z1 Characteristic valueF-H2 F-H3F-Z2 F-Z3 Single sample method
F-H4~11F-Z4~11 Multi-sample method
The plan
1. Introduction
2. References
3. COD gage
4. The plan