Numerical Simulation of Ductile Fracture Process Including Shear-Lip Fracture

Abstract:

Thickness effect is studied experimentally. At free surface of the specimen, shear lip fracture pattern appears, though dimple fracture pattern is observed inside of the specimen. The area of shear-lip fracture changes due to the change of the specimen thickness. In this study, experimental study is conducted by changing specimen thicknesses. Fracture surfaces are precisely observed using SEM, and dimple patterns on them are observed. At the free surface, very narrow no-void area is observed. It is also found that many voids are nucleated in shear-lip fracture area. FEM simulation is carried out using Gurson’s constitutive equation. It is found that shear-lip type fracture is simulated near free surface area by this method. The results show similar tendency with the experimental observation.

• Periodical: Key Engineering Materials (Volumes 345-346)
• Pages: 839-844
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.345-346.839
• Online since: August 2007
• Authors: Masanori Kikuchi
• Keywords: 3 Point Bending Specimen, Dimple Fracture, Finite Element Analysis Method, Shear-Lip Fracture, Stress Triaxiality, Void

References

[1] Rice, J.R. (1968); Transactions. ASME, J. Applied Mechanics, vol. 90, Series E, pp.379-386.

[2] C. Betegon, C. Rodriguezand F.J. Belzunce: Fatigue Fract. Engng Mater. Struct, 20(1997), 633-644.

[3] Ruggieri C. and Dodds Jr. (1996) , Int. J. Fracture 79, pp.309-340.

[4] Xia L. and Shih C. F. (1996): J. Mech. Phys. Solids 44, pp.603-639.

[5] O'Dowd N. P and Shih C. F. (1991), J. Mech. Phys. Solids 39, pp.989-1015.

[6] Sorem.W. A, Dodds R.H. and Rolfe S.T.: Int. J. Fracture, 47(1991), 105.

[7] JSME Standard S 001-1992 (1992), Japan Society of Mechanical Engineer.

[8] Koers R. W. J., Kroom A. H. M. and Bakker A. (1995): ASTM STP 1224.

[9] C. Betegon et al.: Fatigue Fract. Engng Mater. Struct, 20(1997), 633-644.

[10] Gurson, A.L. (1977); Trans. ASME, J. Engineering and Materials and Technology, 99, pp.2-15.

[11] Tvergaard. V. (1982): Int. J. Fracture 18, pp.237-252.

[12] Kikuchi, M , Miyamoto, H. , Otoyo, H and Kuroda, M (1991); JSME International Journal Series I, Vol. 34 , No. 1, pp.90-97.

[13] Broek, D. (1973); Eng. Frac. Mech., vol. 5. pp.55-56.