| 聚乙烯醇纤维增强水泥复合材料板的冲切性能 |
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| 引用本文： | 李安令,张朝辉,郭帅成,朱德举. 聚乙烯醇纤维增强水泥复合材料板的冲切性能[J]. 复合材料学报, 2021, 38(3): 902-910. DOI: 10.13801/j.cnki.fhclxb.20200616.001 |
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| 作者姓名： | 李安令 张朝辉 郭帅成 朱德举 |
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| 作者单位： | 湖南大学土木工程学院 绿色先进土木工程材料及应用技术湖南省重点实验室,长沙410082;上海城建市政工程(集团)有限公司,上海200331 |
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| 基金项目： | 国家自然科学基金(51778220,U1806225);长沙市科学计划项目(KQ1907115);湖南省研究生科研创新项目(CX2016B109)。 |
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| 摘 要： | 利用MTS试验机对聚乙烯醇纤维(PVA)/水泥复合材料板进行准静态冲切试验，研究了不同PVA纤维掺量对其破坏形态和承载力的影响。结果表明:掺入PVA纤维能够将水泥基板的破坏形态由脆性破坏转为延性破坏。PVA/水泥复合材料板的冲切极限荷载和耗能能力均随PVA纤维掺量增加而增大，其中耗能能力的增大更显著。进一步采用Instron 落锤冲击系统对PVA纤维体积分数为2vol%的PVA/水泥复合材料板进行动力冲切试验，研究冲切速度(2.0~4.2 m/s)对PVA/水泥复合材料板的破坏形态、初裂荷载、极限荷载、初始刚度及耗能性能的影响。结果表明:与准静态试验相比，冲切荷载作用下PVA/水泥复合材料板的极限荷载增大，而耗能减少；此外相对初裂荷载和耗能，极限荷载的冲切速度相关性最显著。基于上述结果，构建了纤维增强水泥复合材料四线型拉伸本构模型，并通过反算模型和塑性铰线方法对纤维增强水泥复合材料板的冲切力学性能进行模拟，并得到材料的本构参数。本研究可以为PVA/水泥复合材料的抗冲切设计提供技术支撑。
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| 关 键 词： | 纤维增强水泥复合材料 聚乙烯醇(PVA)纤维 冲击载荷 应力-应变响应 塑性铰 |
| 收稿时间： | 2020-05-08 |
Punching performance of polyvinyl alcohol fiber reinforced cementitious composite slab |
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| LI Anling,ZHANG Zhaohui,GUO Shuaicheng,ZHU Deju. Punching performance of polyvinyl alcohol fiber reinforced cementitious composite slab[J]. Acta Materiae Compositae Sinica, 2021, 38(3): 902-910. DOI: 10.13801/j.cnki.fhclxb.20200616.001 |
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| Authors: | LI Anling ZHANG Zhaohui GUO Shuaicheng ZHU Deju |
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| Affiliation: | 1.Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China2.Shanghai Urban Construction Municipal Engineering (Group) Co. Ltd., Shanghai 200331, China |
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| Abstract: | A quasi-static punching test was conducted on polyvinyl alcohol(PVA)fiber/cementitious composite slab by using MTS testing machine.The effects of the PVA fiber content on the failure mode and bearing capacity of PVA/cementitious composite slab were studied based on the experimental results.The results show that incorporating of PVA fiber can change the failure mode of the PVA/cementitious composite slab from brittle failure to ductile failure.And both the punching capacity and the energy absorption capacity of the PVA/cementitious composite slab increase with the fiber content and more obvious rise can be observed for the energy absorption capacity.Then the dynamic punching test of PVA reinforced cementitious composite slab with 2 vol%volume fraction of PVA was carried out by using Instron dropweight impact system.The influences of the impact velocity(2.0–4.2 m/s)on the failure mode,cracking impact loading,ultimate impact loading,initial stiffness and energy absorption capacity of the PVA/cementitious composite slab were investigated.The results show that compared with the results from the quasi-static test,the ultimate loading of the PVA/cementitious composite slab increases while the energy absorption capacity decreases under the punching force.Also,a more significant increase in ultimate loading with the loading velocity can be observed,compared with that of the energy absorption capacity.A qua-linear tensile constitutive model of fiber reinforced cementitious composite was constructed based on these experimental results,and the punching mechanic behavior of the fiber reinforced cementitious composite slab was simulated by the back-calculation model based on the plastic hinge method,and the material parameters of the fiber reinforced cementitious composite were obtained.This study can provide a solid base for the punch performance design of the PVA/cementitious composite slab. |
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| Keywords: | fiber reinforced cementitious composite polyvinyl alcohol(PVA)fibers impact loading stress-strain response plastic hinge |
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