Title:
Toughness of Fiber Reinforced Mortar at High Tensile Loading Rates
Author(s):
Michal A. Glinicki
Publication:
Materials Journal
Volume:
91
Issue:
2
Appears on pages(s):
161-166
Keywords:
cements; dynamic tests; fibers; fracture properties; loading rate; mortars (material); tension tests; toughness; Materials Research
DOI:
10.14359/4568
Date:
3/1/1994
Abstract:
The influence of loading rate on fracture energy of steel fiber reinforced mortar was studied experimentally. Uniaxial tensile tests were performed using "paddle-shaped" specimens at loading rates within the range of 0.001 to 1000 MPa/sec(1.45 x 10 -4 to 1.45 x 10 2 ksi/sec). Test results include load-deformation diagrams obtained at various loading rates. The fracture energy of fiber reinforced cement and concrete (FRC) specimens is discussed in comparison to published data. Results of tensile tests are related to fiber reinforcement parameters. The proposed relationship predicts a monotonous increase of fracture energy of fibrous composites due to an increase in number of fibers and loading rate. An evaluation of loading rate sensitivity is performed considering elementary fracture mechanics, including matrix cracking, fiber debonding, and pullout. A good agreement with experimental results is obtained, taking into account the parameters of fiber shape and orientation as well as fiber-matrix bond quality.