13th International Conference on Fracture June 16–21, 2013, Beijing, China -6- ( ) / ( / ) 1.67290.03291 / V a W a W η η λ Δ = = − − (20) 3 Conclusions 1> Based on the FEA, the function λ(a/W) is got. 2> Connecting FEA and function λ(a/W), the plastic factor formulation of front face compact tension is obtained. 3> Using the plastic factor of front face compact tension specimen, the J resistance curve would be perfectly solved by the normalization data reduction technology in ASTM E1820-11. Based on the plastic hinge theory of bending specimen and the plastic factor of load line compact tension, the unified plastic factor calculation is investigated in future. From the unified plastic factor, considering the normalization data reduction in ASTM E1820-11, the J resistance curve would be perfectly solved. Acknowledgements The financial support of the National Nature Science Foundation of China, Grant NO.11072205, is gratefully acknowledged. We are also grateful for the valuable assistance of Key Laboratory of Strength and Vibration, the SWJTU Laboratory. References [1] MERKLE J G, CORTEN H T. A J integral analysis for the compact specimen considering axial force as well as bending effects[J]. Journal of Pressure Vessel Technology, 1974, Vol. 96. [2] EWING D J F, RICHARDS C E. The yield-point loads of singly-notched pin-loaded tensile trips[J]. Journal of the Mechanics and Physics of Solids, 1974, 22(1): 27-36. [3] Turner C E. in Post-Yield Fracture Mechanics, LATZKO D G H (ed.), Applied Science Publishers, London, 1979: 23-211. [4] WU S X, MAI Y W, COTTERELL B. Plastic η-factor (ηp) of fracture specimens with deep and shallow cracks[J]. International Journal of Fracture, 1990, Vol. 45: 1-18 [5] DAVIES C M, KOURMPETIS M, DOWD N P O et al. Experimental evaluation of the J or C* parameter for a range of crack geometries[J]. Journal of ASTM International, 2006, 3(4): 1-20. [6] KIRK M T, DOIDDS R H. J and CTOD estimation equations for shallow cracks in single edge notch bend specimens[J]. Journal of Testing and Evaluation, 1993, Vol. 21: 228-238. [7] NEVALAINEN M, DODDS R H. Numerical investigation of 3-D constraint effects on brittle fracture in SE(B) and C(T) specimens[J]. International Journal of Fracture, 1990, 74(2): 131-161. [8] KIM Y J, KIM J S, CHO S M. 3-D constrain on J testing and crack tip constraint in M(T), SE(B) and C(T) specimens: numerical study[J]. Engineering Fracture Mechanics, 2004, 71(9-10): 1203-1218. [9] DONATO G H B, RUGGIERI C. Estimation procedure for J and CTOD fracture parameters using three-point bend specimens[C]. Proceedings of the 6th International Pipeline Conference, 2006, Calgary, Canada, Paper Number: IPC2006-10165. [10] KIM Y J, SCHWALBE K H. On experimental J estimation equations based on CMOD for SE(B) specimen[J]. Journal of Testing and Evaluation, 2001, 29(1): 67-71. [11] RICE J R. A path independent integral and the approximate analysis of strain concentration by notches and cracks[J]. Journal of Applied Mechanics, 1968, Vol. 35: 379-386.
RkJQdWJsaXNoZXIy MjM0NDE=