| Interlaminar Crack Propagation Analysis of ENF Specimens Based on the Cohesive Zone Model北大核心CSCD |
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| 引用本文： | 邓健,肖鹏程,王增贤,邵光冉,卢天健.Interlaminar Crack Propagation Analysis of ENF Specimens Based on the Cohesive Zone Model北大核心CSCD[J].应用数学和力学,2022,43(5):515-523. |
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| 作者姓名： | 邓健 肖鹏程 王增贤 邵光冉 卢天健 |
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| 作者单位： | 1.南京航空航天大学 机械结构力学及控制国家重点实验室，南京 210016 |
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| 基金项目： | 国家自然科学基金（12002157;12032010;11972185）；;中央高校基本科研业务费； |
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| 摘 要： | Based on the classical laminated plate theory and the cohesive zone model, a theoretical model for general delamination cracked laminates was established for crack propagation of pure mode Ⅱ ENF specimens. Compared with the conventional beam theory, the proposed model fully considered the softening process of the cohesive zone and introduced the nonlinear behavior of ENF specimens before failure. The predicted failure load is smaller than that under the beam theory and closer to the experimental data in literatures. Compared with the beam theory with only fracture toughness considered, the proposed model can simultaneously analyze the influences of the interface strength, the fracture toughness and the initial interface stiffness on the load-displacement curves in ENF tests. The results show that, the interface strength mainly affects the mechanical behavior of specimens before failure, but has no influence on crack propagation. The fracture toughness is the main parameter affecting crack propagation, and the initial interface stiffness only affects the linear elastic loading stage. The cohesive zone length increases with the fracture toughness and decreases with the interface strength. The effect of the interface strength on the cohesive zone length is more obvious than that of the fracture toughness. When the adhesive zone tip reaches the half length of the specimen, the adhesive zone length will decrease to a certain extent. Copyright ©2022 Applied Mathematics and Mechanics. All rights reserved.
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| 关 键 词： | ENF试验 分层 黏聚区 裂纹 |
| 收稿时间： | 2022-03-14 |
Interlaminar Crack Propagation Analysis of ENF Specimens Based on the Cohesive Zone Model |
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| Deng J.,Xiao P.,Wang Z.,Shao G.,Lu T..Interlaminar Crack Propagation Analysis of ENF Specimens Based on the Cohesive Zone Model[J].Applied Mathematics and Mechanics,2022,43(5):515-523. |
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| Authors: | Deng J Xiao P Wang Z Shao G Lu T |
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| Affiliation: | 1.State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P.R.China2.MIIT Key Laboratory of Multifunctional Lightweight Materials and Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P.R.China |
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| Abstract: | Based on the classical laminated plate theory and the cohesive zone model, a theoretical model for general delamination cracked laminates was established for crack propagation of pure mode Ⅱ ENF specimens. Compared with the conventional beam theory, the proposed model fully considered the softening process of the cohesive zone and introduced the nonlinear behavior of ENF specimens before failure. The predicted failure load is smaller than that under the beam theory and closer to the experimental data in literatures. Compared with the beam theory with only fracture toughness considered, the proposed model can simultaneously analyze the influences of the interface strength, the fracture toughness and the initial interface stiffness on the load-displacement curves in ENF tests. The results show that, the interface strength mainly affects the mechanical behavior of specimens before failure, but has no influence on crack propagation. The fracture toughness is the main parameter affecting crack propagation, and the initial interface stiffness only affects the linear elastic loading stage. The cohesive zone length increases with the fracture toughness and decreases with the interface strength. The effect of the interface strength on the cohesive zone length is more obvious than that of the fracture toughness. When the adhesive zone tip reaches the half length of the specimen, the adhesive zone length will decrease to a certain extent. |
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| Keywords: | Cohesive zone Crack Delamination ENF test |
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