By Folker H. Wittmann, Xiaozhi Hu (auth.), Z. P. Bažant (eds.)
From time to time the overseas magazine of Fracture has awarded issues regarded as of certain curiosity to its readers. The final precise subject evaluation was once offered through Drs W.G. Knauss and AJ. Rosakis as visitor Editors in 4 concerns, January-April 1990, less than the overall name of Non Linear Fracture. It contained sections on harm mechanisms, interfaces and creep, time depen dence, and continuum plasticity insofar as they have an effect on the mechanisms of the fracture method. carrying on with this coverage, that's in line with our acknowledged goals, the 2 September concerns care for the habit of concrete and cementious fabrics in the course of fracture initiation and propagation. we are hoping that the consequent cutting-edge evaluate will yield one other instructive and well timed product which readers will locate helpful. to aid us in proposing this topic, we've got prevailed upon a widely known foreign specialist in concrete habit, Dr. Z.P. Bazant, Walter P. Murphy Professor of Civil Engineering, of Northwes tern collage to behave as visitor Editor. On behalf of the editors and publishers, I desire to thank Professor BaZant and his invited authors for project this exact attempt. M.L. WILLIAMS Pittsburgh, Pennsylvania Editor-in-Chief September 1991 overseas magazine of Fracture fifty one: ix-xv, 1991. Z.P. Bafant (ed.), present developments in Concrete Fracture Research.
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Laser speckle technique 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. K. P. S. ), ACI (1988) 83-109. A. P. 1. Bjelkhagen, Experimental Mechanics (1988) 388-394. J. S. M. Hawkins, in  (1989) 199-204. P. K. H. 4. A. Hillerborg, M. E. Petersson, Cement and Concrete Res 6 (1976) 773-782. P. Bazant, Journal of Engineering Mechanics, ASCE 110 (1984) 518-538. S. P. Shah, Journal of Engineering Mechanics, ASCE 111 (1985) 1227-1241. L. Karihaloo and P. Nallathambi, Final Report of Sub-committee A Notched Beam Test; Mode I Fracture Toughness of RILEM TC89-FMT (1988).
3 and 4 . Figure 3 shows the crack growth of one single crack, in case the stress fields are adjusted by the function k(a) or not. The crack growth in the fictitious plane for various loading rates is given in Fig. 4. From these results it emerges that for low loading rates the limiting velocity for a single crack is the Rayleigh wave, as it should be, but that the terminal crack velocity decreases with increasing loading rate. When the finite geometry of the fictitious fracture plane is considered, the same feature is observed for the rate dependency (Fig.
1. Weerheijm, Properties of Concrete Under Dynamic Loading 3. Fracture Model for Brittle Materials, PML 1990-9, Rijswijk (1990). LN. Sneddon, in Mechanics of Fracture 1. c. ), Noordhoff, Leyden (1973). P. Chen, in Proceedings Symposium on Cement-Based Composites: Strain Rate Effects on Fracture, Materials Research Society Symposium Proceedings 64 (1986) 63-77. R. P. Shah, A fracture mechanics model to predict the rate sensitivity of mode I fracture of concrete, Northwestern University, Evanston, November 1986.