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충남대학교 건설재료시공학연구실

Building material & construction lab.

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국외학술발표

손민재, 김규용, 이상규, 황의철, 사수이, 남정수 (2019), Strain Rate Effect on the Tensile Behavior of Hybrid Fiber Reinforced Cementitious Composites with Hooked Fiber and Polyvinyl Alcohol Fiber, 2019 Design and Analysis of Protective Structures
손민재, 김규용, 이상규, 황의철, 사수이, 남정수 (2019), Strain Rate Effect on the Tensile Behavior of Hybrid Fiber Reinforced Cementitious Composites with Hooked Fiber and Polyvinyl Alcohol Fiber, 2019 Design and Analysis of Protective Structures
작성자 관리자
조회수 160 등록일 2019.12.04
주저자 이상규
교신저자 042-821-7731
공동저자 황의철, 손민재, 남정수, 김홍섭
학술지명 2019 Design and Analysis of Protective Structures
ABSTRACT
It is reported that the influence of the strain rate on the bond properties between fibers and matrix is large in the
previous research and the bond properties of fibers and matrix have a greater influence on tensile strength and
toughness than the compressive strength of fiber reinforced cement composite. Therefore, in this study, a direct
tensile test was carried out for bundle type polyamide fiber and hooked steel fiber reinforced cement composite
under the conditions of static strain rate of 10-6/s and dynamic strain rate of 101/s. Moreover, tensile properties
such as tensile strength, strain capacity and toughness of fiber reinforced cement composite by strain rate are
evaluated, and the influence of the shape of bundle type polyamide fiber and hooked steel fiber on the bond and
pull-out behavior of fiber and matrix by strain rate was investigated.
In the case of the polyamide fiber, the fibers were cut off without being pulled out from the matrix regardless of
the strain rate.
On the other hand, in the case of hooked steel fiber, a fracture behavior was observed in which hooked end
portion of the fiber was linearly elongated and pulled out from the matrix at a strain rate of 1 0-6/s. However, at a
strain rate of 101/s, the mechanical bond between the fiber and the matrix increases, so that the matrix was broken
in a state in which the fiber shape was maintained.
As a results, the tensile strength of the polyamide fiber and the mechanical bond between hooked steel fiber and
matrix are considered to have a great influence on the tensile behavior of fiber reinforced cement composite.