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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2022, Vol. 56 Issue (1): 84-91    DOI: 10.3785/j.issn.1008-973X.2022.01.009
    
Experimental study on interface shear fracture of UHTCC and steel
Qing-hua LI(),Ning BAO,Guo-zhong WANG
College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
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Abstract  

The mechanical properties of bimaterial interface were analyzed in order to apply ultra-high toughness cement-based composites (UHTCC) to long-span steel box girder bridges. The propagation process of shear crack at the interface between UHTCC and steel was analyzed by using non-notched unilateral symmetrical loading composite specimens. The feasibility of the method for quantitative determination of interfacial shear fracture toughness of bimaterials was verified by digital image correlation (DIC) method. The effects of different interfacial treatment methods on the interfacial shear fracture toughness of composite specimens were analyzed. The test results show that the quantitative test of pure shear fracture toughness of interface can be realized by using UHTCC- steel without notch unilateral symmetrical loading composite specimen combined with DIC technology. Different interface treatment methods have little effect on the shear fracture toughness of the interface between UHTCC and steel. The interface between UHTCC and steel has high shear fracture toughness and good shear resistance.

Key words： ultra-high toughness cementitious composites      digital image correlation method      interface      shear fracture toughness     
Received: 12 March 2021      Published: 05 January 2022
CLC:  TU 502  
Fund:  国家自然科学基金资助项目(5197080976)
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Qing-hua LI
Ning BAO
Guo-zhong WANG
Cite this article:

Qing-hua LI,Ning BAO,Guo-zhong WANG. Experimental study on interface shear fracture of UHTCC and steel. Journal of ZheJiang University (Engineering Science), 2022, 56(1): 84-91.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2022.01.009     OR     https://www.zjujournals.com/eng/Y2022/V56/I1/84


UHTCC与钢材界面的剪切型断裂试验研究

为了将超高韧性水泥基复合材料(UHTCC)应用于大跨径钢箱梁桥，研究双材料界面的力学性能. 采用无切口单边对称加载复合试件，研究UHTCC与钢材界面剪切型裂缝扩展过程. 利用数字图像相关法(DIC)，验证该方法用于定量测定双材料界面剪切型断裂韧度的可行性，探究不同界面处理方式对复合试件界面剪切型断裂韧度的影响. 试验结果表明，采用UHTCC-钢材无切口单边对称加载复合试件，结合DIC技术可以实现界面纯剪切型断裂韧度的定量测试；不同界面处理方式对UHTCC与钢材界面剪切型断裂韧度的影响均较小；UHTCC与钢材界面具有较高的剪切断裂韧度，抗剪切性能良好.


关键词： 超高韧性水泥基复合材料,  数字图像相关法,  界面,  剪切型断裂韧度 
Fig.1 Unnotched UHTCC-steel composite specimen bearing single side symmetrical load
Fig.2 Definition of K-space angle of fracture mixing degree
钢材种类 fy/MPa fu /MPa Es /GPa μs
Q345qD 345 504 206 0.3
Tab.1 Mechanical properties of Q345qD
纤维种类 lf/mm df/μm ff /MPa lfe /% Ef /GPa ρf /(g·cm-3)
K-II REC15 12 39 1620 7 42.8 1.3
Tab.2 Properties of PVA fiber
材料 Esu /GPa μU fcu /MPa ftc /MPa
UHTCC 17.7 0.19 50.8 4.85
Tab.3 Mechanical properties of UHTCC
组别 界面处理方式 试件个数
A 不处理 9
B 丙烯酸黏结剂 9
C 丙烯酸黏结剂+石英砂 9
Tab.4 Grouping of specimens
Fig.3 Illustrations of test setups and measurement scheme for UHTCC-steel composite specimens
Fig.4 Load-displacement curves of part of specimens
Fig.5 Illustration of variations of major strain contours of specimen B2
Fig.6 Failure characteristics of UHTCC-steel interface
Fig.7 Computational domains on specimen
Fig.8 Slip displacement curves of representative specimens for each group
Fig.9 Load-time curves of representative specimens for each group
试件 Pc/kN σc /MPa KIIc/ （MPa·m1/2） |ψ|/（°）
A1 489.51 48.95 6.89 83.16
A2 457.93 45.79 6.44 86.22
A3 376.91 37.69 5.30 85.95
A4 471.98 47.20 6.64 82.19
A6 458.32 45.83 6.45 82.86
A7 418.81 41.88 5.89 83.68
A9 350.57 35.06 4.93 85.80
B1 558.38 55.84 7.86 84.17
B2 460.62 46.06 6.48 84.57
B4 367.78 36.78 5.18 83.89
B5 374.74 37.47 5.27 83.08
B6 444.13 44.41 6.25 81.76
B7 335.10 33.51 4.72 84.71
B8 351.28 35.13 4.94 85.01
C1 385.09 38.51 5.42 83.13
C2 525.86 52.59 7.40 84.08
C4 392.78 39.28 5.53 82.16
C5 489.59 48.96 6.89 81.91
C8 319.30 31.93 4.49 83.61
C9 358.42 35.84 5.04 85.75
Tab.5 Specimen IDs and critical parameters
Fig.10 Mode II fracture toughness of each group of specimens
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