The J-integral as a fracture criterion for fiber reinforced concrete

✍ Scribed by Sidney Mindess; Frederick V. Lawrence; Clyde E. Kesler

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 612 KB
• Volume: 7
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(77)90057-6

✦ Synopsis

The J-integral, a one-parameter average measure of the elastic-plastic field near a crack tip, was investigated as a fracture criterion for fiber-reinforced concrete. Cement paste, plain concrete and eight different steel and glass fiber concretes in the form of notched beams were tested in bending, and JIC, as well as the linear elastic fracture mechanics parameters KIC and GIC were evaluated. The results suggest that JIC is a promising fracture criterion for all of these, while KIC (or GIC) almost certainly are not, except for cement paste. In evaluating the effect of steel fiber additions, it was found that a fiber addition of less than 0.75% did not improve the strength or fracture behaviour of the concrete, nor did JIC change very much. However, at higher fiber contents, JIC showed significant increases, reflecting the changed character of the material; KIC and GIC did not.