A Fracture toughness criterion for concrete
| Autor: | Y. S. Jenq, Surendra P. Shah |
|---|---|
| Rok vydání: | 1985 |
| Předmět: |
Materials science
business.industry Mechanical Engineering Fracture mechanics Structural engineering Crack growth resistance curve Nonlinear system Fracture toughness Mechanics of Materials Crack mouth Deflection (engineering) General Materials Science Composite material business Compact tension specimen Beam (structure) |
| Zdroj: | Engineering Fracture Mechanics. 21:1055-1069 |
| ISSN: | 0013-7944 |
| DOI: | 10.1016/0013-7944(85)90009-8 |
| Popis: | Many have attempted to calculate the fracture toughness of concrete in Mode I by testing notched beam specimens. It has been observed that when K I c is calculated from the measured values of the maximum load, the initial notch length and using the formulas developed from LEFM, its value is dependent on the dimensions of the beam. This size and geometry dependency can be attributed to slow crack growth and nonlinearity due to geometrical interlock effects. A method is suggested to calculate a size independent fracture toughness parameter. To calculate the value of K I c according to the proposed method, inelastic displacements are extracted from the total displacements and the slow crack growth is included by incorporating crack closing-pressure. Using this constant K I c criterion, the load vs crack mouth opening displacement and load vs deflection curves were accurately predicted for 40 beams of different sizes tested for this investigation as well as those reported by other investigators. |
| Databáze: | OpenAIRE |
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