By G. C. Sih (auth.), S. P. Shah (eds.)
Portland cement concrete is a comparatively brittle fabric. accordingly, mechanical habit of concrete, conventionally bolstered concrete, prestressed concrete, and fiber bolstered concrete is severely inspired by means of crack propagation. it truly is, therefore, no longer incredible that makes an attempt are being made to use the options of fracture mechanics to quantify the resistance to cracking in cementious composites. the sphere of fracture mechanics originated within the 1920's with A. A. Griffith's paintings on fracture of brittle fabrics equivalent to glass. Its most vital functions, even though, were for controlling brittle fracture and fatigue failure of steel buildings akin to strain vessels, airplanes, ships and pipe strains. substantial improvement has happened within the final two decades in editing Griffith's rules or in presenting new suggestions to account for the ductility usual of metals. due to those efforts, common checking out recommendations were to be had to procure fracture parameters for metals, and layout in response to those parameters are integrated in correct standards. Many makes an attempt were made, within the final 20 years or so, to use the fracture mechanics ideas to cement, mortar, con crete and bolstered concrete. thus far, those makes an attempt haven't resulted in a different set of fabric parameters that may quantify the resistance of those cementitious composites to fracture. No ordinary trying out equipment and a usually permitted theoretical research are validated for concrete as they're for metals.
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Extra resources for Application of Fracture Mechanics to Cementitious Composites
The zone within which the mechanical interlock and microcracking occur is referred to as the process zone for rock and ceramic materials [1,2J. In some glassy polymers this inelastic zone is called crazing [3,4,5J. Another example in which mechanical interlock may occur is at the cracking of the cancellous bone/PMMA interface, which may be a failure mechanism for artificial joints. Mechanical modeling using this failure mechanism has been initiated by Mak, et al. [6J, Mak and Keer [7J, Keer and Meade [8J, and Clech, et al.
The testing for each group of specimens was completed within a period of a maximum of five days. As mentioned earlier t great care was exercised in placing the specimens i~ the loading frame to minimize any out-of~plane bending. /minute) at the load line. TypicallYt loading was stopped five times during the test to take a replica of the specimen surface. EveD with the relative slow rate of loading t it was evident by watching the displacement transducer output that cracking continued for some time after loading was stopped.
Plastic-Fracturing Theory for Concrete. Journal of Engineering Mechanics, ASCE, vol. 105 (1979) 407-428. Energy of Concrete: Method of Concrete Research, vol. 10 (1980) of Concrete: Practical Performance Cement and Concrete Research, vol. 49 10. Bazant, Z. P. and R. H. Oh. Crack Rand Theory for Fracture of Concrete. Materieuax et Constructions, vol. 16 (19R2) 155177. 11. Wecharatana, M. and S. P. Shah. Prediction of Nonlinear Fracture Process Zone in Concrete. Journal of Engineering Mechanics, ASCE, vol.