Effect of fiber properties and matrix composition on the tensile behavior of strain-hardening cement-based composites (SHCCs) subject to impact loading
Effect of fiber properties and matrix composition on the tensile behavior of strain-hardening cement-based composites (SHCCs) subject to impact loading
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DOI：
10.1016/j.cemconres.2015.12.008
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发表时间：
2016-04-01
影响因子：
11.4
通讯作者：
Millon, Oliver
中科院分区：
文献类型：
--
作者：
Curosu, Iurie;Mechtcherine, Viktor;Millon, Oliver
本文介绍了高强度和正常强度应变硬化水泥基复合材料（SHCC）细颗粒基体和高密度聚乙烯纤维制成的准静态和冲击拉伸载荷下的行为。采用Hopkinson杆在应变速率约为150 s（-1）的条件下对无缺口和有缺口圆柱体进行了动态拉伸试验。动态和准静态拉伸载荷下的材料的响应进行了比较，在以前的调查中获得的聚乙烯醇纤维制成的正常强度SHCC的相应结果。为了解释不同SHCC组合物对材料性能的速率影响的显著差异，研究了开裂模式和断裂表面条件。此外，应变率相关的变化，在个别纤维的力学行为和纤维-基体界面性能推导出单纤维拉伸试验和纤维拔出试验，分别。总而言之，所获得的结果提供了明确的指示，作为一个有目的的材料设计的抗冲击类型的SHCC用于结构元件或保护覆盖层的决定性参数。(C)2015爱思唯尔有限公司版权所有。
The article at hand describes the behavior of high-strength and normal-strength strain-hardening cement-based composites (SHCCs) made of fine-grained matrix and high-density polyethylene fibers under quasi-static and impact tensile loading. The dynamic tension testing of unnotched and notched cylinders was performed using the Hopkinson bar at strain rates of around 150 s(-1). The responses of the materials under dynamic and quasi static tensile loading were compared to the corresponding results for normal-strength SHCC made of polyvinyl-alcohol fibers as obtained in previous investigations. To explain the pronounced differences in rate effects on the material performance of various SHCC compositions, cracking pattern and fracture surface conditions were studied. Additionally, strain rate dependent changes in the mechanical behavior of individual fibers and in the fiber-matrix interfacial properties were deduced from single-fiber tension tests and fiber pullout tests, respectively. Altogether, the results obtained provide clear indications as to the decisive parameters for a purposeful material design of impact resistant types of SHCC for use in structural elements or protective overlays. (C) 2015 Elsevier Ltd. All rights reserved.