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Journal of ZheJiang University (Engineering Science)  2023, Vol. 57 Issue (3): 573-582    DOI: 10.3785/j.issn.1008-973X.2023.03.015
    
Finite element implementation and application of strength theory based cohesive zone model
Tian-xiang SHI1(),Xin ZHANG1,Yang-yang WANG1,Ke-hong ZHENG2,Yong-qiang ZHANG1,*()
1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
2. School of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China
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Abstract  

The two-dimensional strength theory based cohesive zone model (ST-CZM) was extended to the three-dimensional case for a wider application. Furthermore, the finite element implementation of the ST-CZM was carried out using the Abaqus user element subroutine (UEL). The validity and accuracy of the ST-CZM were validated by several typical numerical benchmarks. On this basis, the ST-CZM finite element model was used to simulate the bond-slip behavior of the interface between fiber reinforced polymer (FRP) and concrete, which extended the application of the ST-CZM in complex working conditions. Compared to the traditional “traction laws” based cohesive zone model (CZM), the ST-CZM provides improved flexibility in mode mixity and allows independent selection of strength models in normal and tangent directions. In addition, the ST-CZM exhibits better convergence performance and more accurate strength predictions compared to “traction laws” based CZMs. All examples show that compared to the traditional “traction laws” based CZM, the ST-CZM finite element model can better predict the peak stress of the bonding interface and simulate the mixed-mode damage process, showing more realistic cracking process.



Key wordsstrength theory      cohesive zone model      Abaqus UEL      interface fracture     
Received: 29 March 2022      Published: 31 March 2023
CLC:  TB 121  
  O 346.5  
Fund:  国家自然科学基金资助项目(12172019, 52004245)
Corresponding Authors: Yong-qiang ZHANG     E-mail: stxzj@zju.edu.cn;cyqzhang@zju.edu.cn
Cite this article:

Tian-xiang SHI,Xin ZHANG,Yang-yang WANG,Ke-hong ZHENG,Yong-qiang ZHANG. Finite element implementation and application of strength theory based cohesive zone model. Journal of ZheJiang University (Engineering Science), 2023, 57(3): 573-582.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2023.03.015     OR     https://www.zjujournals.com/eng/Y2023/V57/I3/573


基于强度理论的内聚力模型的有限元实现及应用

在对基于强度理论的内聚力模型(ST-CZM)进行二维整理及三维拓展的基础上,使用Abaqus用户单元子程序(UEL)对该模型进行有限元实现. 通过经典界面破坏算例验证ST-CZM有限元模型的有效性和准确性,建立纤维增强复合材料(FRP)加固混凝土模型,采用ST-CZM模拟FRP与混凝土界面间的黏结破坏过程,实现ST-CZM在复杂工况下的应用. 相较于传统基于牵引力准则的内聚力模型,ST-CZM具有更灵活的混合模态耦合方式,且其切向和法向的强度模型相互独立,ST-CZM的收敛性更好,对强度的预测更准确. 所有算例表明,相较于传统基于牵引力准则的内聚力模型,ST-CZM有限元模型能够更好地实现黏结界面峰值应力的预测和损伤阶段的模拟.


关键词: 强度理论,  内聚力模型,  Abaqus UEL,  界面破坏 
Fig.1 Traction-separation relation of cohesive element under unidirectional load
Fig.2 Two-dimensional traction-failure surface
Fig.3 Three-dimensional traction-failure surface
模型 σI /MPa ueI/mm KI /(N·mm?3) GI/(N·mm?1) σII /MPa ueII /mm KII /(N·mm?3) GII /(N·mm?1)
双悬臂梁 30 3.0×10?4 1.0×105 0.26 60 6.0×10?4 1.0×105 1.002
固定比率混合 30 3.0×10?4 1.0×105 0.26 60 6.0×10?4 1.0×105 1.002
混合模态弯曲 100 4.0×10?4 2.5×105 0.50 100 4.0×10?4 2.5×105 0.500
Tab.1 Material parameters for cohesive elements in verification models for strength theory cohesive zone model[18]
模型 E11 /GPa E22, E33 /GPa G12, G13 /(N·mm?1) G23 /(N·mm?1) v12, v13 v23
双悬臂梁 120 10.5 5.25 3.48 0.30 0.51
固定比率混合 120 10.5 5.25 3.48 0.30 0.51
混合模态弯曲 122 122.0 0.25 0.25
Tab.2 Material parameters of matrix in verification models for strength theory cohesive zone model
Fig.4 Geometry properties and boundary conditions of double cantilever beam specimen
Fig.5 Comparison of model test results and numerical simulation results of double cantilever beam
Fig.6 Boundary conditions of fixed ratio mixed mode
Fig.7 Comparison of numerical simulation results of fixed ratio hybrid model
Fig.8 Geometry properties of mixed mode bending specimen
Fig.9 Comparison of numerical values and analytical results of mixed mode bending model
试验数值模型 σI /MPa ueI/mm KI /(N·mm?3 GI/(N·mm?1 σII /MPa ueII /mm KII /(N·mm?3 GII /(N·mm?1
单剪 8.77 0.019 1 459.160 0.494 8.77 0.019 1 459.160 0.494
四点弯曲梁 12.00 0.029 0 0.297 0.891 12.00 0.029 0 0.297 0.891
Tab.3 Material parameters of cohesive element in practical models for strength theory cohesive zone model
Fig.10 Geometry properties of single-shear specimen
Fig.11 Comparison results of simple shear model test and numerical simulation
Fig.12 Damage propagation of single shear model
Fig.13 Geometry properties of four-point bending beam
Fig.14 Experimental crack patterns of L2D1250[24]
Fig.15 Local debonding positions plot of L2D1250[24]
Fig.16 Tensile damage contour L2D1250
Fig.17 Comparison of L2D1250 test and numerical simulation results
Fig.18 Experimental crack patterns of L2D1750[24]
Fig.19 Local debonding positions plot of L2D1750[24]
Fig.20 Tensile damage contour of L2D1750
Fig.21 Comparison of L2D1750 test and numerical simulation results
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