Abstract
The mixed-mode, elastodynamic state of stress in the neighborhood of a constant-velocity crack tip is used to generate numerically unsymmetric isochromatics. Unsymmetry associated with the third-order terms of a mixed-mode stress field, with and without the Mode II singular stress term, is also investigated. In extractingK I from an unsymmetric isochromatic pattern, errors in the Mode I fracture parameters due to the assumed presence ofK II in aK I stress field were found to be significant when data are taken more than 4 mm from the crack tip.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Smith, D.G. andSmith, C.W., “Photoelastic Determination of Mixed Mode Stress Intensity Factors,”Eng. Frac. Mech.,4,357–366 (1972).
Gdoutos, E.E. andTheocaris, P.S., “A Photoelastic Determination of Mixed-Mode Stress-Intensity Factors,”Experimental Mechanics,18 (3),87–96 (March1978).
Dally, J.W. andSanford, R.J., “Classifications of Stress Intensity Factors from Isochromatic Fringe Patterns,”Experimental Mechanics,18 (12),441–448 (Dec.1978).
Rossmanith, H.P., “Analysis of Mixed-Mode Isochromatic Crack-Tip Fringe Patterns,”Acta Mech.,34,1–38 (1979).
Bradley, W.B. andKobayashi, A.S., “Fracture Dynamics—A Photoelastic Investigation,”Eng. Frac. Mech.,3,317–332 (1971).
Dally, J.W., “Dynamic Photoelastic Studies of Fracture,”Experimental Mechanics,19 (10),349–367 (Oct.1979).
Rossmanith, H.P. and Irwin, G.R., “Analysis of Dynamic Isochromatic Crack-Tip Stress Patterns,” Univ. of Maryland Rep. (1979).
Rossmanith, H.P. andShukla, A., “Dynamic Photoelastic Investigation of Interaction of Stress Waves with Running Cracks,”Experimental Menial Mechanics,21 (11),415–422 (Nov.1981).
Kobayashi, A.S. andRamulu, M., “Dynamic Stress Intensity Factors for Unsymmetric Dynamic Isochromatics,”Experimental Mechanics,21 (1),41–48 (Jan.1981).
Kobayashi, A.S. and Ramulu, M., “Dynamic Mixed-Mode Fracture,” Proc. US-Greece Symp. on Mixed-Mode Crack Propagation, ed. G.C. Sih and P.S. Theocaris, Sijthoff & Noordhoff, 163–172 (1981).
Ramulu, M. andKobayashi, A.S., “Dynamic Crack Curving — A Photoelastic Evaluation,”Experimental Mechanics,23 (1),1–9 (Jan.1983).
Ramulu, M., Kobayashi, A.S. and Kang, B.S.-J., “Dynamic Crack Branching—A Photoelastic Evaluation,” Frac. Mech. (15), ASTM STP, to be published (1983).
Rossmanith, H.P., “Crack Propagation and Branching,” Proc. Symp. on Absorbed Spec. Energy/Strain Energy Density, ed. G.C. Sih, E. Czoboly, and F. Fillemot, Budapest, Hungary, 283–294 (1981).
Rossmanith, H.P., “How Mixed is Dynamic Mixed-Mode Crack Propagation?-A Dynamic Photoelastic Study,”J. Mech. Phys. Sol.,31,251–260 (1983).
Nishioka, T. andAtluri, S.N., “Path Independent Integrals, Energy Release Rates, and General Solutions of Near-Tip Fields in Mixed Mode Dynamic Fracture Mechanics,”Eng. Frac. Mech.,17,1–22 (1983).
Sanford, R.J. andDally, J.W., “A General Method for Determining Mixed Mode Stress Intensity Factors from Isochromatic Fringe Patterns,”Eng. Frac. Mech.,11,621–633 (1979).
Chona, R., Irwin, G.R. andShukla, A., “Two and Three Parameter Representations of Crack-tip Stress Fields,”J. Strain Anal.,17,79–86 (1982).
Hawang, J.S., Kobayashi, A.S., Dadkhah, M.S., Kang, B.S.-J. and Ramulu, M., “Dynamic Crack Curving and Branching Under Biaxial Loading,” 1985 SEM Spring Conf. on Exper. Mech., Las Vegas, NV.
Ramulu, M., Kobayashi, A.S., Kang, B.S.-J., andBarker, D.B., “Further Studies on Dynamic Crack Branching,”Experimental Mechanics,23 (4),431–437 (Dec.1983).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Ramulu, M., Kobayashi, A.S. & Barker, D.B. Analysis of dynamic mixed-mode isochromatics. Experimental Mechanics 25, 344–353 (1985). https://doi.org/10.1007/BF02321332
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02321332