Paper Title:
Bridging Toughening and Fracture Energy of X-Type Fiber Reinforced Cementitious Composites
  Abstract

Based on the fiber bridging model and constant frictional interface stress, this paper derived the P-δ relation for the X-type fiber pulled out of cementitious matrix. By considering the random distributions of the bridging fibers and supposing that rupture of fiber never occurs, it derived the σB-δ relation of a single macro-crack, from which the fracture energy equation was deduced by integral. The derived toughening equations have continuous and explicit forms and are convenient for the approximate estimate of the fracture toughness of the composite. The fracture energy expression suggests that increasing fiber volume fraction, utilizing longer fibers or slender fibers and improving interface bonding are effective methods for improving the composite fracture toughness, while adopting fibers with higher elastic modulus is not a preferred suggestion. It is also found that when using X-type fibers to replace cylindrical fibers with same section area, one can obtain 3~8 times of fracture energy (corresponding leg length-width ratio of the X-type fiber cross section is 5~50).

  Info
Periodical
Advanced Materials Research (Volumes 368-373)
Chapter
Chapter 1: High Strength High Performance Materials and New Structural System
Edited by
Qing Yang, Li Hua Zhu, Jing Jing He, Zeng Feng Yan and Rui Ren
Pages
419-422
DOI
10.4028/www.scientific.net/AMR.368-373.419
Citation
S. Y. Zhang, M. H. Dong, "Bridging Toughening and Fracture Energy of X-Type Fiber Reinforced Cementitious Composites", Advanced Materials Research, Vols. 368-373, pp. 419-422, 2012
Online since
October 2011
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Price
$32.00
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