Establishment of Unified Correlation of In-Plane and Out-of-Plane Constraints with Ductile Fracture Toughness of Steel
In this paper,the finite element method (FEM) based on GTN damage model was used to obtain ductile fracture toughness and investigate the establishment method of unified correlation of in-plane and out-of-plane constraints with ductile fracture toughness of steels.The unified constraint parameter Ap at different equivalent plastic strain (εp) isolines has been calculated and analyzed for SEN(B) specimens with a wide range of in-plane and out-of-plane constraints.The results show that the average Ap along the specimen thickness (Apave) can well characterize a wide range of in-plane and out-of-plane constraints.The suitable εp isolines range for establishing the unified correlation between Apave and ductile fracture toughness of the steel has been obtained.For the specimens with lower constraint,the higher εp values should be used.The results also show that the correlation line of JC/Jref-Apave 1/2 is independent of the selections of the suitable εp isolines and the reference specimen.This may bring convenience for the establishment and application of the JC/Jref -Apave 1/2correlation lines.Using ductile fracture toughness data of a small number of specimens with different constraints (such as three specimens with different a/W) together with FEM calculations of the parameter Ap,the correlation line of JC/Jref-Apave 1/2 can be established.The correlation line may be used in structural integrity assessments incorporating both in-plane and out-of-plane constraints.
In-plane constraint out-of-plane constraint unified correlation ductile fracture toughness equivalent plastic strain finite element method
B.R.Yan G.Z.Wang F.Z.Xuan S.T.Tu
Key Laboratory of Pressure Systems and Safety,Ministry of Education,East China University of Science and Technology,Shanghai 200237,China
国际会议
2016 International Symposium on Structural Integrity，ISSI—2016(2016国际结构完整性研讨会)
天津
英文
22-27
2016-05-26（万方平台首次上网日期，不代表论文的发表时间）