Download e-book for kindle: 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.)

ISBN-10: 9400951213

ISBN-13: 9789400951211

ISBN-10: 9401087644

ISBN-13: 9789401087643

Portland cement concrete is a comparatively brittle fabric. for that reason, mechanical habit of concrete, conventionally strengthened concrete, prestressed concrete, and fiber bolstered concrete is severely encouraged by means of crack propagation. it really is, therefore, no longer brilliant that makes an attempt are being made to use the suggestions 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 reminiscent of glass. Its most vital purposes, despite the fact that, were for controlling brittle fracture and fatigue failure of steel constructions comparable to strain vessels, airplanes, ships and pipe­ traces. massive improvement has happened within the final 20 years in editing Griffith's rules or in presenting new suggestions to account for the ductility commonplace of metals. because of those efforts, typical trying out concepts were on hand to acquire fracture parameters for metals, and layout in keeping with those parameters are incorporated in correct 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. to this point, those makes an attempt haven't resulted in a different set of fabric parameters which may quantify the resistance of those cementitious composites to fracture. No typical trying out tools and a more often than not permitted theoretical research are proven for concrete as they're for metals.

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Example text

It is believed those discrepancies are due primarily to friction effects from the rollers applying the loads to the loading wedge, and investigations are underway to determine the magnitude of those effects. Through a numerical experiment, shear effects behind the advancing crack tip, calculated in accordance with models developed by several researchers, were found to have a negligible effect on the relationships for predicted values in Figure 19. CONCLUSIONS A fracture process zone with the variable crack opening resistance and prescribed CTOn ' s, has been used slJccessfully to predict stable crack growth in CLWL-OCR concrete specimens which were loaded under mode I and mixed modes I and II.

0 Wedge Load vs COD Curves. 0 39 1800 , . . - - - - - - - - - - - - - - - - - - - - . SMALL SPECIMENS o o ISOO t::. 8 TOTAL CRACK LENGTH, Q\/W Figure 10. 7 TOTAL CRACK LENGTH • °t /W Wedge Load vs Total Crack Length (aiW) Figure 11. 283 : ~ ~..! ",.. "", w-"" T Sllp Cage '" ~ '" 1- '" N N o/ Figure 12. 875" o.. 875" -I CLWL-DCB Specimen with Diagonal Compression Loading 41 specimens have had concrete strengths of about 3,500 psi. A typical crack propagation result is shown in Figure 13. The crack grew in what appeared to be the principal stress direction.

Extraneous displacements were detected by a small loading and unloading cycle where the out-ofplane bending appears as a hysteresis in the 2V1 -2V 2 plot. The crack length and extent of microcracking was measured by a replicating technique involving use of an acetylcellulose film. The technique, which is commonly used in electron microscopy and fractography, was first applied by Kobayashi and Fourney [16J for microcrack detection in rock. For our test series, one surface of the fracture specimen was polished with a carborundum stone while the concrete was still green and replicas of the polished surface were taken at specified load intervals.

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

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