CFRP布/树脂胶复合条带的抗拉力学性能

郑康; 陈力; 方秦; 高飞

doi:10.11858/gywlxb.2017.06.015

CFRP布/树脂胶复合条带的抗拉力学性能

doi: 10.11858/gywlxb.2017.06.015

解放军理工大学爆炸冲击防灾减灾国家重点实验室，江苏南京 210007

基金项目:

国家自然科学基金优秀青年基金 51622812

国家重点基础研究发展计划课题 2015CB058003

详细信息

作者简介:
郑康(1991—), 男，硕士研究生，主要从事工程结构抗爆研究.E-mail:zhengkang1991@qq.com

通讯作者:
陈力(1982—), 男，博士，副教授，博士生导师，主要从事工程结构抗爆研究.E-mail:chenli1360@qq.com

中图分类号: O347; TB332
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出版历程
- 收稿日期: 2017-01-11
- 修回日期: 2017-04-03

Tensile Properties of CFRP/Epoxy Gel Composite Strip

State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact, PLA University of Science and Technology, Nanjing 210007, China

摘要

摘要: 碳纤维聚合物(CFRP)编织布和环氧树脂胶已被广泛应用于工程结构的外贴抗爆加固。为了了解CFRP布/树脂胶复合成型材料的基本力学性能，系统开展了标准复合条带试件的准静态拉伸力学试验，得到了拉伸应力-应变全过程曲线，并基于试验结果标定了有限元模型的关键材料参数。研究结果表明：CFRP布/树脂胶复合成型材料呈现明显的弹脆性特点，抗拉强度能够达到4 100 MPa，外贴树脂胶能够显著降低CFRP布力学性能指标的离散性，保证CFRP布材料特性的充分发挥；初始树脂粘贴缺陷对条带试件的破坏形态和抗拉性能有显著影响，外贴树脂胶的施工均匀度对加固工程结构的抗爆性能至关重要。
- 碳纤维聚合物 /
- 树脂胶 /
- 应力-应变全曲线 /
- 拉伸试验
Abstract: Carbon fiber reinforced polymer (CFRP) laminates and epoxy gels have been extensively applied to externally strengthen engineering structures to resist blast loading.In order to understand the mechanical properties of CFRP/epoxy gel composites, we carried out a series of quasi-static tensile tests and obtained the entire tensile stress-strain curve.Based on the test results, we calibrated the material parameters of the finite element model developed in LS-DYNA software.It is found that CFRP/epoxy gel composites exhibit an obvious elastic-brittle characteristic, and the mean value of the tensile strength obtained in the test is up to 4 100 MPa.Being externally attached with resin gel, the disadvantage of discrete characteristics of CFRP laminates was significantly improved, which makes the externally bonded CFRP fully effective.The initial defects of the pasted epoxy gels significantly affect the failure modes and tensile properties of the tested specimen, and the uniformity of the sprayed layer of epoxy gels is of great importance to improving the blast resistance of the retrofitted engineering structures.
- carbon fiber reinforced polymer /
- resin gel /
- stress-strain entire curve /
- tensile test

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图 1 试件的制备过程

Figure 1. Preparation of specimen

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图 2 试件及编号

Figure 2. Numbered specimens

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图 3 试件端部铝片夹具(蓝色部分为树脂胶)

Figure 3. Aluminum clamp on the specimen end (The blue part is epoxy gel)

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图 4 试验装置

Figure 4. Testing device

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图 5 试验后试件的不同破坏形态

Figure 5. Failure modes of specimens after test

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图 6 各试件的应力-应变曲线

Figure 6. Stress-strain relationship of specimens

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图 7 试件抗拉强度及其均值

Figure 7. Tensile strength and its mean value

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图 8 试件临界应变及其均值

Figure 8. Critical strain and its mean value

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图 9 带缺陷试件在试验前、后的对比

Figure 9. Comparison of specimens with defects before and after test

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图 10 C-Ⅴ试件端部铝片的破坏

Figure 10. Damage of aluminum clamp on the end (C-Ⅴ)

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图 11 试件有限元模型

Figure 11. Finite element model of specimen

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图 12 数值计算的应力-应变全曲线

Figure 12. Stress-strain relationship in simulation

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图 13 拉伸试验与数值模拟的破坏形态对比

Figure 13. Comparison of failure mode in tensile test and simulation

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表 1 拉伸试验结果

Table 1. Results of tensile test

Test No.	f_t/(MPa)	E/(GPa)	ε_c	η_c/(%)
C-Ⅰ	4 070.57 (-0.96%)	202.26	0.016 233 83 (-8.15%)	1.62
C-Ⅱ	—	—	—	—
C-Ⅲ	4 506.13 (9.63%)	210.04	0.018 479 13 (4.55%)	1.84
C-Ⅳ	4 236.29 (3.07%)	205.77	0.017 956 60 (1.60%)	1.79
C-Ⅴ	4 021.92 (-2.15%)	211.07	0.020 028 14 (13.32%)	2.00
C-Ⅵ	3 754.01 (-8.66%)	227.65	0.016 929 41 (-4.22%)	1.69
C-Ⅶ	4 071.60 (-0.94%)	215.95	0.016 420 93 (-7.09%)	1.64
Mean value	4 100.10	212.12	0.017 446 52	1.74
Note:(1) Data in the brackets are the relative error to the mean value; (2) Test results for specimen C-Ⅱ are not recorded due to technical error.

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表 2 CFRP材料的力学参数

Table 2. Mechanical parameters of CFRP

Reference	CFRP type	f_t/(MPa)	E/(GPa)	ε_c
Ref.[15]	UT70-30	3 400	230.0	0.015
Ref.[16]	UT70-30	3 788	217.6
Ref.[17]	UT70-30	3 550	235.0
Ref.[18]	UT70-30	3 788	218.0	0.017

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