2[1]Feddersen C E. Evaluation and prediction of the residual strength of centre cracked tension panels. ASTM STP 486,1971. 50 ~ 78.
3Sullivan A M, Freed C N, Stoop J. Comparison of R curves determined from different specimen types[J]. ASTM STP, 1973, 527: 85-104.
4Schwalbe K H, Setz W. R curve and fracture toughness of thin sheet materials[J]. Journal of Testing and Evaluation, 1981, 9(4) : 13.
5Hellmann D, Sehwalbe K H. Geometry and size effects on JR and Delta-R curves under plane stress conditions[M]. Germany: GKSS-Forschungszentrum Geesthacht, 1985.
6Putatunda S K, Rigsbee J M, Corten H T. Effect of size on elastic-plastic fracture toughness parameters[J]. Journal of Testing and Evaluation, 1985, 13(3): 181-190.
7Fett T, Munz D, Geraghty R D, et al. Influence of speci- men geometry and relative crack size on the R curve[J]. Engineering Fracture Mechanics, 2000, 66(4): 375-386.
8Schwalbe K H, Newman Jr J C, Shannon Jr J L. Fracture mechanics testing on specimens with low constraint stan dardisation activities within ISO and ASTM[J]. Engineer ing Fracture Mechanics, 2005, 72(4): 557-576.