TY - JOUR
T1 - Micromechanical analysis of multiple fracture and evaluation of debonding behavior for fiber-reinforced composites
AU - Shuh-Huei, Li
AU - Shah, Surendra P.
AU - Zongjin, Li
AU - Toshio, Mura
N1 - Funding Information:
Acknowledgements-This research was supported by the National Science Foundation Center for Science and Technology of Advanced Cement-Based Materials (ACBM) Grant DMR-9120002 and partially supported by Air Force Office of Scientific research under grant F49620-92-J-0319.
PY - 1993
Y1 - 1993
N2 - Enhanced stress capacity during multiple matrix cracking in unidirectional, continuous fiber-reinforced brittle matrix composites subjected to uniaxial tension has been investigated by using the energy approach of fracture mechanics, in which the bridging stress of the fibers in the matrix crack is determined by the inclusion method. The interactions among the multiple fracture, the interfacial debonding and the frictional sliding are discussed. Theoretical predictions for the stresses at the end point of multiple cracking and the debonding lengths have been derived. To verify the validity of the theoretical model, an experimental study was conducted with cement-based composites made with different volume fractions of steel fibers. The steel fiber reinforced specimens were loaded under uniaxial tension to various pre-determined stress (deformation) magnitudes, and then the deformations in the specimen were "frozen" by gluing rigid steel blocks on the specimen. The technique of optical fluorescence microscopy was used to acquire the extent of debonding length quantitatively from thin sectioned samples obtained by cutting the "frozen" specimen. A "stable growth" of debonding was observed in the study. The theoretical predictions are compared with the experimental results and a reasonable agreement is shown.
AB - Enhanced stress capacity during multiple matrix cracking in unidirectional, continuous fiber-reinforced brittle matrix composites subjected to uniaxial tension has been investigated by using the energy approach of fracture mechanics, in which the bridging stress of the fibers in the matrix crack is determined by the inclusion method. The interactions among the multiple fracture, the interfacial debonding and the frictional sliding are discussed. Theoretical predictions for the stresses at the end point of multiple cracking and the debonding lengths have been derived. To verify the validity of the theoretical model, an experimental study was conducted with cement-based composites made with different volume fractions of steel fibers. The steel fiber reinforced specimens were loaded under uniaxial tension to various pre-determined stress (deformation) magnitudes, and then the deformations in the specimen were "frozen" by gluing rigid steel blocks on the specimen. The technique of optical fluorescence microscopy was used to acquire the extent of debonding length quantitatively from thin sectioned samples obtained by cutting the "frozen" specimen. A "stable growth" of debonding was observed in the study. The theoretical predictions are compared with the experimental results and a reasonable agreement is shown.
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U2 - 10.1016/0020-7683(93)90070-N
DO - 10.1016/0020-7683(93)90070-N
M3 - Article
AN - SCOPUS:0027208341
VL - 30
SP - 1429
EP - 1459
JO - International Journal of Solids and Structures
JF - International Journal of Solids and Structures
SN - 0020-7683
IS - 11
ER -