Abstract
The newly derived dynamic-crack-branching criterion with its modifications is verified by the dynamicphotoelastic results of dynamic crack branchings in thinpolycarbonate, single-edged crack-tension specimens. Successful crack branching was observed in four specimens and unsuccessful branching in another. Crack branching consistently occurred when the necessary conditions ofK I =K I b =3.3 MPa\(\sqrt m\) and the sufficiency condition ofr o =r c =0.75 mm were satisfied simultaneously. In the unsuccessful branching test, the necessary condition was not satisfied sinceK I was always less thanK I b .
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References
Rossmanith, H.P., “Crack Branching of Brittle Materials, Part I,” Univ. of Maryland Rep. (1977–1980).
Dally, J.W., “Dynamic Photoelastic Studies of Fracture,”Experimental Mechanics,19, (10),349–367 (1979).
Ramulu, M. andKobayashi, A.S., “Dynamic Crack Curving—A Photoelastic Evaluation,”Experimental Mechanics,23 (1),1–9 (1983).
Ramulu, M., Kobayashi, A.S. and Kang, B.S.J., “Dynamic Crack Branching—A Photoelastic Evaluation,” Fracture Mechanics (in press) (15th), ASTM STP (1983).
Streit, R. andFinnie, I., “An Experimental Investigation of Crack-path Directional Stability,Experimental Mechanics,20, (1),17–23 (Jan.1980).
Ramulu, M., Kobayashi, A.S. andKang, B.S.J., “Dynamic Crack Curving and Branching in Line-Pipe,”J. Pres. Ves. Tech., ASME, 104, 317–322 (Nov.1983).
Kim, K.S., private communication (July 15, 1983).
Almond, E.A., Petch, N.J., Wraith, A.E. andWright, E.S., “The Fracture of Pressurized Laminated Cylinders,”J. Iron and Steel Inst., 207, 1319–1323 (Oct.1969).
Congleton, J., “Practical Applications of Crack-Branching Measurements,”Dynamic Crack Propagation, ed. G.C. Sih, Noordhoff Int. Pub., Leyden, 427–438 (1973).
Shannon, R.W.E. and Wells, A.S., “A Study of Ductile Crack Propagation in Gas Pressurized Pipeline,” Proc. Int. Symp. on Pipeline, Newcastle upon tyne, Paper No. 17 (March 1974).
Ramulu, M. and Kobayashi, A.S., “Dynamic Crack Curving and Crack Branching,” Material Behavior Under High Stress and Ultra-High Loading Rates, Sagamore Mat. Res. Conf. 19, Syracuse Univ. (1983, in press).
Freund, L.B., “Dynamic Crack Propagation,” Mechanics of Fracture, ed. F. Erdogan, ASME,19,105–134 (1976).
Kobayashi, A.S. andRamulu, M., “Dynamic Stress-intensity Factor for Unsymmetric Dynamic Isochromatics,”Experimental Mechanics 21, (1),41–48 (Jan.1981).
Sanford, R.J. andDally, J.W., “A General Method for Determining Mixed Mode Stress Intensity Factors from Isochromatic Fringe Patterns, Eng. Fract. Mech., 11, 621–633 (1979).
Sun, Y.J., Ramulu, M., Kobayashi, A.S. andKang, B.S.J., “Further Studies on Dynamic Crack Curving,” Developments in Theoretical and Applied Mechanics, ed.T.J. Chung andG.R. Karr, The Univ. of Alabama, Huntsville,11,203–218 (1982).
Kalthoff, J.F., “On the Propagation of Bifurcated Cracks,” Dynamic Crack Propagation, ed. G.C. Sih, Noordhoff Int. Pub., 449–458 (1973).
Ramulu, M. andKobayashi, A.S., “Strain Energy Density Fracture Criterion in Elasto-Dynamic Mixed Mode Crack Propagation,”Eng. Fract. Mech.,18,1087–1098 (1983).
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Ramulu, M., Kobayashi, A.S., Kang, B.S.J. et al. Further studies on dynamic crack branching. Experimental Mechanics 23, 431–437 (1983). https://doi.org/10.1007/BF02330060
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DOI: https://doi.org/10.1007/BF02330060