混杂纤维增强应变硬化水泥基复合材料的压缩本构关系

张聪; 余志辉; 韩世诚; 华渊

doi:10.13801/j.cnki.fhclxb.20190823.002

混杂纤维增强应变硬化水泥基复合材料的压缩本构关系

doi: 10.13801/j.cnki.fhclxb.20190823.002

张聪^{1, 2, ,},
余志辉¹,
韩世诚¹,
华渊¹

1.
江南大学　环境与土木工程学院，无锡 214000
2.
武汉理工大学　硅酸盐建筑材料国家重点实验室，武汉 430000

基金项目: 江苏省自然科学基金青年项目(BK20170192)；硅酸盐建筑材料国家重点实验室开放基金(SYSJJ2017-11)；中央高校基本科研业务项目(JUSRP11712)

详细信息

通讯作者:
张聪，博士，副教授，硕士生导师，研究方向为高性能纤维水泥基复合材料与结构　E-mail：zhangcong@jiangnan.edu.cn

中图分类号: TB332
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出版历程
- 收稿日期: 2019-05-30
- 录用日期: 2019-07-22
- 网络出版日期: 2019-08-23
- 刊出日期: 2020-05-15

Compression constitutive relation of hybrid fiber reinforced strain hardening cementitous composites

ZHANG Cong^{1, 2
, ,},
YU Zhihui¹,
HAN Shicheng¹,
HUA Yuan¹

1.
School of Environment and Civil Engineering，Jiangnan University, Wuxi 214000, China
2.
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430000, China

摘要

摘要: 混杂纤维增强应变硬化水泥基复合材料(HyF/SHCC)的力学性能是近年来的研究热点问题之一，但是目前依然欠缺HyF/SHCC压缩本构关系的深入探讨。本文研究了钢纤维(SF)-聚乙烯醇(PVA)纤维增强SHCC (SF-PVA/SHCC)的压缩应力-应变全曲线，分析了纤维对HyF/SHCC抗压强度、压缩应变以及压缩韧性的影响。研究发现，在本文研究工况下混杂纤维的引入对材料的抗压强度无明显影响，但是提高了压缩峰值应变。钢纤维对HyF/SHCC压缩韧性的影响较为显著，且随着钢纤维掺量的增大，HyF/SHCC的压缩韧性逐渐提高。基于损伤力学理论，从能量的角度提出了一种新的单轴压缩本构模型，通过与试验曲线的对比，发现该模型可以较好地预测SF-PVA/SHCC的压缩应力-应变关系。
- 应变硬化水泥基复合材料 /
- 混杂 /
- 钢纤维 /
- 聚乙烯醇纤维 /
- 压缩性能 /
- 本构模型
Abstract: Mechanical properties of hybrid fiber reinforced strain hardening cementitious composites (HyF/SHCC) have been one of the hot topics in recent years. However, there is still a lack of in-depth discussion on the constitutive relationship of HyF/SHCC in compression. In this paper, the full compressive stress-strain curve of HyF/SHCC containing steel fiber(SF) and polyvinyl alcohol (PVA) fiber was investigated. The compressive strength, strain and toughness of SF-PVA/SHCC were discussed. The results indicate that the introduction of hybrid fibers has no significant effect on the compressive strength of SF-PVA/SHCC in this case, but it increases the corresponding strain at peak stress. The effect of SF on the compressive toughness of SF-PVA/SHCC is significant. The compressive toughness increases gradually with the increase of SF content. Based on the theory of damage mechanics, a new uniaxial compression constitutive model was proposed from the perspective of energy. Through the comparison with the experimental curves, it was found that the proposed model could well predict the compressive stress-strain relationships of SF-PVA/SHCC.
- strain hardening cementitious composite /
- hybrid /
- steel fiber /
- polyvinyl alcohol fiber /
- compressive property /
- constitutive model

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图 1 压缩试验加载装置

Figure 1. Loading instrument for compressive test

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图 2 SHCC、PVA/SHCC和SF-PVA/SHCC试件的压缩应力-应变曲线

Figure 2. Compressive stress-strain curves of SHCC, PVA/SHCC and SF-PVA/SHCC

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图 3 本研究中HyF/SHCC的纤维增强因子R_v与弹性模量E (a)以及韧性指数(b)的关系

Figure 3. Relationships of reinforcing index R_v with elastic modulus E (a) and toughness index T (b) of HyF/SHCC in this study

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图 4 本构模型预测的PVA/SHCC和SF-PVA/SHCC压缩应力-应变曲线结果与试验结果的对比

Figure 4. Comparison of compressive stress-strain curves between predicted results and experimental results for PVA/SHCC and SF-PVA/SHCC based on the constitutive model

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表 1 应变硬化水泥基复合材料（SHCC）中纤维体积分数

Table 1. Volume fraction of different fibers in strain hardening cementitious composite (SHCC)

No.	Group	Volume fraction/%
No.	Group	Steel fiber (SF)	PVA fiber (PVA)
Control	Plain	0	0
PVA/SHCC	PVA2	0	2.00
SF-PVA/SHCC-1	SF0.25-PVA1.75	0.25	1.75
SF-PVA/SHCC-2	SF0.5-PVA1.5	0.50	1.50
SF-PVA/SHCC-3	SF0.75-PVA1.25	0.75	1.25
SF-PVA/SHCC-4	SF1-PVA1	1.00	1.00

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表 2 SHCC、PVA/SHCC和SF-PVA/SHCC试件的平均弹性模量、峰值应力、峰值应变与压缩韧性

Table 2. Average elastic modulus, peak stress, peak strain and compressive toughness of SHCC, PVA/SHCC and SF-PVA/SHCC

No.	Groups	Elastic modulus/ GPa	Peak stress/ MPa	Peak strain/ 10⁻⁶	Compressive toughness/ (N·mm/mm³)
Control	Plain	16.4	39.4	3 017	20.5
PVA/SHCC	PVA2	17.2	36.6	4 094	31.3
SF-PVA/SHCC-1	SF0.25PVA1.75	18.5	37.3	4 119	38.6
SF-PVA/SHCC-2	SF0.5PVA1.5	19.1	38.7	3 556	39.4
SF-PVA/SHCC-3	SF0.75PVA1.25	19.6	37.7	4 553	40.8
SF-PVA/SHCC-4	SF1-PVA1	20.6	38.3	3 445	41.3

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