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

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 stimulated via crack propagation. it truly is, hence, now not magnificent that makes an attempt are being made to use the recommendations 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 corresponding to glass. Its most vital functions, in spite of the fact that, were for controlling brittle fracture and fatigue failure of steel constructions corresponding to strain vessels, airplanes, ships and pipe­ strains. enormous improvement has happened within the final two decades in enhancing Griffith's principles or in providing new suggestions to account for the ductility usual of metals. because of those efforts, general trying out ideas were on hand to procure fracture parameters for metals, and layout in response to those parameters are integrated in proper standards. Many makes an attempt were made, within the final twenty years or so, to use the fracture mechanics recommendations to cement, mortar, con­ crete and strengthened concrete. thus far, those makes an attempt haven't resulted in a special set of fabric parameters which may quantify the resistance of those cementitious composites to fracture. No normal trying out equipment and a quite often authorised theoretical research are tested for concrete as they're for metals.

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B. Barker*** and B. M. Liaw* University of Washington *Department of Mechanical Engineering **Department of Civil Engineering Seattle, WA 98195 ***On leave from University of Maryland at the time of this study ABSTRACT Double displacement compliance and replica techniques were used to determine the macro and total crack lengths, respectively in nineteen crack-line wedge-loaded, double cantilever beam (CLWLDCB) mode I concrete specimens. netails of the fracture process zone, which lies between the macro and hairline crack tips, were determined through numerical experiments involving a finite element model of the CLWL-OCR concrete specimens.

These preliminary results showed that different failure mechanisms exist in a pull-out test. These mechanisms are governed by the geometry of the test. As shown in Figure 9 for short reaction distances cracking initiates at approximately 50% of the ultimate load. At this load cracking was observed through the microscope and the load-slip curve becomes non-linear. These results are similar to those reported ;n [34]. (The discrepancy between 33% in [34] and 5~ here ;s probably due to 3-D effects and differences in matrix properties).

20-140 power, clearly showed the extent of surface cracking. The replicating technique consistently followed surface cracks 1/2 to 1 inch (13-25mm) further in length than that determined by viewing the surface directly under lOx magnification. The test series consisted of four groups with four specimens per group. The group 2 specimens were tested twice. So that, in all, nineteen CLWL-OCB specimens were tested. Table 1 summarizes the major variable changes between the four groups~ Table 1 - CLWL-nCR Test Groups Group No.

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