Application of Fracture Mechanics to Cementitious Composites by G. C. Sih (auth.), S. P. Shah (eds.)

By G. C. Sih (auth.), S. P. Shah (eds.)

Portland cement concrete is a comparatively brittle fabric. therefore, mechanical habit of concrete, conventionally strengthened concrete, prestressed concrete, and fiber strengthened concrete is severely stimulated through crack propagation. it really is, hence, now not mind-blowing that makes an attempt are being made to use the techniques of fracture mechanics to quantify the resistance to cracking in cementious composites. the sector of fracture mechanics originated within the 1920's with A. A. Griffith's paintings on fracture of brittle fabrics akin to glass. Its most important functions, even though, were for controlling brittle fracture and fatigue failure of metal buildings resembling strain vessels, airplanes, ships and pipe­ traces. significant improvement has happened within the final 20 years in editing Griffith's principles or in providing new strategies to account for the ductility average of metals. because of those efforts, commonplace checking out strategies were to be had to procure fracture parameters for metals, and layout in line with those parameters are integrated in suitable requirements. Many makes an attempt were made, within the final twenty years or so, to use the fracture mechanics suggestions to cement, mortar, con­ crete and bolstered concrete. to date, those makes an attempt haven't resulted in a special set of fabric parameters that can quantify the resistance of those cementitious composites to fracture. No typical trying out tools and a regularly authorised theoretical research are demonstrated for concrete as they're for metals.

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Another group of specimens were 50% larger with a thickness of 3 in. 5 in. 35. A miniature 5,000 lb. _ The two crack line displacements, VI and V2' were monitored with clip gages. The three transducer outputs were recorded on a digital data acquisition system for later plotting and ana 1ys is. Great care was exercised in the construction of the loading frame and during the experiments toel iminate any out-of-plane bending, which would introduce errors in crack-line displacement measurements, of the sepcimen.

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