钢-PVA混杂纤维增强水泥基复合材料冲击压缩动力性能试验研究
发布时间：2018-08-13 13:53
【摘要】：钢-PVA混杂纤维增强水泥基复合材料是通过在混凝土中掺入钢和PVA纤维来取代混凝土材料中粗骨料的方式制备而成。已有的关于纤维增强水泥基复合材料的研究成果显示：(1)钢纤维可以有效地提高混凝土的动态抗压强度；(2) PVA纤维可以有效地提高混凝土的冲击韧性等。正因如此，本课题着手将钢和PVA纤维进行一定规律地混杂，制备了4种不同混杂方式的钢-PVA混杂纤维增强水泥基复合材料；针对各配比材料分别在单次和多次反复动力冲击压缩试验，研究了该种纤维增强水泥基复合材料的动态力学性能，可以为纤维增强水泥基复合材料的制备、研究以及相应结构的设计和优化提供参考，具有重要的科学研究意义和工程实用价值；对所获取的试验数据进行归纳总结并分析纤维体积掺量为2%钢-PVA混杂纤维增强水泥基复合材料在动力冲击压缩荷载作用下的力学行为，再从各配比材料的破坏形态、动态增强效应以及韧度等角度进行横纵向对比，分析钢纤维和PVA纤维在4种混杂形式下各自配比材料的受力特性，以及最优的纤维混杂形式。 本文首先对国内外关于纤维增强水泥基复合材料的研究进行了简要的综述，同时介绍了水泥基类材料动态力学性能的研究状况。已有的研究成果表明该材料在动态和静态情况下的力学特性具有显著的区别，而关于水泥基类材料在高应变率下动态冲击试验研究数据的可靠性还存在一定的争议，对该类材料动态力学行为的描述也未能达成统一。分离式霍普金森压杆（SHPB）试验技术是目前用于测试材料高应变率下动态增强效应的常用试验手段，本文针对钢-PVA混杂纤维增强水泥基复合材料SHPB试验技术存在的问题提出了相应的解决方案。 本文重点研究纤维体积掺量为2%的钢-PVA混杂纤维增强水泥基复合材料在动静荷载作用下抗压力学性能的研究。通过对所设计的四种不同纤维含量的材料配比进行准静态和多种冲击气压值下的单轴动态冲击压缩试验，试分析比较各配比材料性能的优劣性能。为了保证试验的可靠性及试验数据的有效性，本次SHPB试验考虑了入射波形、应变率范围、端面摩擦及惯性效应等主要影响因素。经过整理相关试验数据，得出了以下几点结论：纤维对水泥基体材料在抗压和韧度方面都存在增强效应，且动力增强因子与应变率对数之间存在着一定的曲线关系；钢-PVA混杂纤维增强水泥基复合材料在不同气压值的SHPB试验中表现出了明显的动力增强、增韧应变率效应，从总体力学性能参数上来看，纤维的掺入对此种混杂纤维材料的改性增强作用明显，，其中以钢纤维的掺入增强效果最为显著。而掺入PVA纤维则有利于材料在动力冲击下峰值应变的提高，并经过综合对比3号配比材料（1%Steel+1%PVA）抵抗动力冲击压缩能力最好。
[Abstract]:Steel-PVA hybrid fiber reinforced cement matrix composites were prepared by adding steel and PVA fibers in concrete instead of coarse aggregate in concrete. The existing research results on fiber reinforced cement matrix composites show that: (1) steel fiber can effectively improve the dynamic compressive strength of concrete; (2) PVA fiber can effectively improve the impact toughness of concrete and so on. Therefore, in this paper, the steel and PVA fibers were mixed regularly, and four kinds of steel-PVA hybrid fiber reinforced cement matrix composites were prepared. In this paper, the dynamic mechanical properties of the fiber reinforced cement matrix composites were studied by single and multiple repeated dynamic impact compression tests, which can be used to prepare the fiber reinforced cement matrix composites. The research as well as the design and optimization of the corresponding structure provide reference, which has the important scientific research significance and the engineering practical value; The experimental data obtained are summarized and analyzed. The mechanical behavior of 2% steel PVA hybrid fiber reinforced cement matrix composites under dynamic impact compression loading is analyzed. The dynamic strengthening effect and toughness were compared horizontally and longitudinally to analyze the mechanical properties of steel fiber and PVA fiber in each of the four hybrid forms, as well as the optimal fiber hybrid form. In this paper, the research on fiber reinforced cement matrix composites at home and abroad is reviewed briefly, and the research status of dynamic mechanical properties of cement based materials is also introduced in this paper. The existing research results show that the mechanical properties of the material under dynamic and static conditions have significant differences, but the reliability of dynamic impact test data for cement based materials at high strain rate is still controversial. The description of the dynamic mechanical behavior of this kind of materials is not uniform. Split Hopkinson pressure bar (SHPB) test technique is a common method for testing dynamic enhancement effect of materials at high strain rate. In this paper, the corresponding solutions to the problems existing in the SHPB test technology of steel-PVA hybrid fiber reinforced cement matrix composites are put forward. In this paper, the compressive mechanical properties of steel / PVA hybrid fiber reinforced cement matrix composites with 2% fiber volume content under dynamic and static loads are studied. Through the uniaxial dynamic impact compression test of four kinds of materials with different fiber content under quasi-static and multiple impact pressure values, the properties of the materials were analyzed and compared. In order to ensure the reliability of the test and the validity of the test data, the main factors affecting the incident waveform, strain rate range, end surface friction and inertia effect are considered in this SHPB test. After finishing the relevant test data, the following conclusions are drawn: fiber to cement matrix material in compressive strength and toughness, and there is a certain relationship between the dynamic strengthening factor and the logarithm of strain rate; Steel-PVA hybrid fiber reinforced cement matrix composites show obvious dynamic strengthening and toughening strain rate effect in SHPB test of different pressure values. The effect of fiber admixture on the modification and reinforcement of the hybrid fiber is obvious, especially steel fiber. The addition of PVA fiber is beneficial to increase the peak strain of the material under dynamic impact, and through comprehensive comparison, the ratio 3 material (1%Steel 1%PVA) has the best resistance to dynamic impact compression.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU528
本文编号：2181184
[Abstract]:Steel-PVA hybrid fiber reinforced cement matrix composites were prepared by adding steel and PVA fibers in concrete instead of coarse aggregate in concrete. The existing research results on fiber reinforced cement matrix composites show that: (1) steel fiber can effectively improve the dynamic compressive strength of concrete; (2) PVA fiber can effectively improve the impact toughness of concrete and so on. Therefore, in this paper, the steel and PVA fibers were mixed regularly, and four kinds of steel-PVA hybrid fiber reinforced cement matrix composites were prepared. In this paper, the dynamic mechanical properties of the fiber reinforced cement matrix composites were studied by single and multiple repeated dynamic impact compression tests, which can be used to prepare the fiber reinforced cement matrix composites. The research as well as the design and optimization of the corresponding structure provide reference, which has the important scientific research significance and the engineering practical value; The experimental data obtained are summarized and analyzed. The mechanical behavior of 2% steel PVA hybrid fiber reinforced cement matrix composites under dynamic impact compression loading is analyzed. The dynamic strengthening effect and toughness were compared horizontally and longitudinally to analyze the mechanical properties of steel fiber and PVA fiber in each of the four hybrid forms, as well as the optimal fiber hybrid form. In this paper, the research on fiber reinforced cement matrix composites at home and abroad is reviewed briefly, and the research status of dynamic mechanical properties of cement based materials is also introduced in this paper. The existing research results show that the mechanical properties of the material under dynamic and static conditions have significant differences, but the reliability of dynamic impact test data for cement based materials at high strain rate is still controversial. The description of the dynamic mechanical behavior of this kind of materials is not uniform. Split Hopkinson pressure bar (SHPB) test technique is a common method for testing dynamic enhancement effect of materials at high strain rate. In this paper, the corresponding solutions to the problems existing in the SHPB test technology of steel-PVA hybrid fiber reinforced cement matrix composites are put forward. In this paper, the compressive mechanical properties of steel / PVA hybrid fiber reinforced cement matrix composites with 2% fiber volume content under dynamic and static loads are studied. Through the uniaxial dynamic impact compression test of four kinds of materials with different fiber content under quasi-static and multiple impact pressure values, the properties of the materials were analyzed and compared. In order to ensure the reliability of the test and the validity of the test data, the main factors affecting the incident waveform, strain rate range, end surface friction and inertia effect are considered in this SHPB test. After finishing the relevant test data, the following conclusions are drawn: fiber to cement matrix material in compressive strength and toughness, and there is a certain relationship between the dynamic strengthening factor and the logarithm of strain rate; Steel-PVA hybrid fiber reinforced cement matrix composites show obvious dynamic strengthening and toughening strain rate effect in SHPB test of different pressure values. The effect of fiber admixture on the modification and reinforcement of the hybrid fiber is obvious, especially steel fiber. The addition of PVA fiber is beneficial to increase the peak strain of the material under dynamic impact, and through comprehensive comparison, the ratio 3 material (1%Steel 1%PVA) has the best resistance to dynamic impact compression.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU528
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