Abstract
An experimental study of the near tip deformation fields for a Single Edge-Cracked specimen (SEC) has been completed. The surface deformation fields for a thin SEC plexiglas specimen have been obtained in the region 0.15 <- r/t <- 0.60, where r is radial distance from the crack tip and t is the specimen thickness, by using a novel computer vision method. The results of the study indicate that the value of the J-Integral obtained from the measured surface deformation, and under the assumption of plane stress linearly elastic behavior, is essentially path independent over a region that is considered to be within the crack tip three-dimensional zone by researchers who have performed tests on other materials.
However, the near-tip, in-plane displacement field does show a deviation from the traditional linear elastic crack tip singularity over the same region, suggesting the need for further studies to address this inconsistency.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
J.R.Rice, Journal of Applied Mechanics 35 (1968) 379–386.
J.R. Rice, Fracture, An Advanced Treatise, H. Liebowitz (ed.), Academic Press, Vol. 2 (1968) 192–311.
J.W.Hutchinson, Journal of the Mechanics and Physics of Solids 16 (1968) 13–31.
J.R.Rice and G.F.Rosengren, Journal of the Mechanics and Physics of Solids 16 (1968) 1–12.
A.J.Rosakis and L.B.Freund, Journal of Engineering Materials and Technology 104 (1982) 115–120.
A.J.Rosakis, C.C.Ma and L.B.Freund, Journal of Applied Mechanics 105 (1983) 777–782.
A.T. Zehnder, A.J. Rosakis and R. Narasimhan, ‘Measurement of the J-Integral with Caustics: and Experimental and Numerical Investigation’, GALCIT SM Report 86–8, California Institute of Technology (1986).
R. Narasimhan and A.J. Rosakis, ‘Three Dimensional Effects Near a Crack Tip in a Ductile Three Point Bend Specimen-Part I: A Numerical Investigation’, GALCIT SM Report 88–6, California Institute of Technology (1988).
A.T. Zehnder and A.J. Rosakis, ‘Three Dimensional Effects Near a Crack Tip in a Ductile Three Point Bend Specimen-Part II: An Experimental Investigation Using Interferometry and Caustics’, GALCIT SM Report 88–7, California Institute of Technology (1988).
C.F.Shih, B.Moran and T.Nakamura, International Journal of Fracture 30 (1986) 79–102.
S. Krishnaswamy, A.J. Rosakis and G. Ravichandran, ‘On the Extent of Dominance of Asymptotic Elastodynamic Crack-Tip Fields; Part II: Numerical Investigation of Three-Dimensional and Transient Effects’, GALCIT SM Report 88–22, California Institute of Technology (1988).
R.V.Mahajan and D.Ravi-Chandar, Experimental Mechanics 29 (1989) 6–11.
E.G. Coker and L.N.G. Filon, A Treatise on Photoelasticity, Cambridge University Press (1931).
A.J.Rosakis and K.Ravi-Chandar, International Journal of Solids and Structures 22 (1986) 121–138.
I.D. Parsons, J.F. Hall and A.J. Rosakis, ‘A Finite Element Investigation of the Elastostatic State Near a Three-Dimensional Edge Crack’, GALCIT SM Report 86–29, California Institute of Technology (1986).
R.H.DoddsJr., International Journal of Fracture 33 (1987) R7-R15.
R.H.DoddsJr., W.C.Carpenter and W.A.Sorem, Engineering Fracture Mechanics 29 (1988) 275–285.
M.A.Sutton, M.Cheng, W.H.PetersIII, Y.J.Chao and S.R.McNeill, Image and Vision Computing 4 (1986) 143–150.
H.A.Bruck, S.R.McNeill, M.A.Sutton and W.H.PetersIII, Experimental Mechanics 29(3) (1989) 261–268.
H.A. Bruck, S.R. McNeill, S.S. Russell and M.A. Sutton, in Nondestructive Testing of Aerospace Requirements G.L. Workman (ed.), Gordon and Breach (1989) 99–111.
G.Wahba, Numerische Mathematik 24 (1975) 383–393.
P.Craven and G.Wahba, Numerische Mathematik 31 (1979) 377–405.
H.R. Busby and C.R. Dohrman, in Proceedings of the VI International Congress on Experimental mechanics, Vol. II (1988) 843–849.
D.A. Chambless, J.C. Suhling, W.F. Swinson and J.L. Turner, in Proceedings of the 1986 Spring Conference on Experimental Mechanics, New Orleans, LA (1986) 991–999.
M.A.Sutton, J.L.Turner, H.A.Bruck and T.L.Chae, Experimental Mechanics 31(2) (1991) 168–178.
M.A. Sutton, T.L. Chae, J.L. Turner and H.A. Bruck in MiCon 90: Advances in Video Technology for Microstructural Control, ASTM STP 1094 (1991) 109–132.
M.A.Sutton, S.R.McNeill, J.Jang and M.Babai, Optical Engineering 27(10) (1988) 870–877.
H.A. Bruck, ‘Analysis of 3-D Effects Near the Crack Tip on Rice's 2-D J-Integral Using Digital Image Correlation and Smoothing Techniques,’ M.S. Thesis, Department of Mechanical Engineering, University of South Carolina (1989).
W.F. Brown, Jr. and J.E. Srawley, Plane Strain Crack Toughness Testing of High Strength Metallic Materials, ASTM STP 410 (1966).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Sutton, M.A., Turner, J.L., Chao, Y.J. et al. Experimental investigations of three-dimensional effects near a crack tip using computer vision. Int J Fract 53, 201–228 (1992). https://doi.org/10.1007/BF00017337
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00017337