Building material & construction lab.
About BMCL
Smart Construction Technology Center
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 | 164 | 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. |