基于黏聚区模型的Z-pin增强复合材料T型接头分层损伤研究 -- 西北工业大学学报,2015,33(3):375-381
论文:2015,Vol:33,Issue(3):375-381
引用本文:
马玉娥, 杜永华, 许盼福. 基于黏聚区模型的Z-pin增强复合材料T型接头分层损伤研究[J]. 西北工业大学学报
Ma Yu'e, Du Yonghua, Xu Panfu. Damage Evolution of Z-Pin Reinforced Composite T-Joint Based on Simplified Bridging Traction Model[J]. Northwestern polytechnical university

基于黏聚区模型的Z-pin增强复合材料T型接头分层损伤研究
马玉娥1,2, 杜永华1, 许盼福1
1. 西北工业大学航空学院, 陕西 西安 710072;
2. 西安交通大学 机械结构强度与振动国家重点实验室, 陕西 西安 710049
摘要:
复合材料T型接头Z-pin增强就是将直径非常细的金属或复合材料pin针植入筋条-蒙皮截面,通过Z-pin的桥接牵引提高接头力学性能。采用ABAQUS有限元软件分别建立了T型接头与Z-pin增强T型接头的三维数值计算模型。基于黏聚区模型,采用新的简化后Z-pin桥接牵引关系模拟Z-pin增强作用过程。模拟了T型接头的拉伸失效模式,计算了其拉伸强度和总耗散能,对比分析了有无Z-pin增强2种接头的载荷-位移曲线和损伤耗散能-位移曲线。数值计算结果与文献中数据符合较好。结果表明:Z-pin增强T型接头的极限载荷与极限位移相比于无增强T型接头分别提高了66%和304%;2种接头的载荷-位移曲线斜率相同,初始损伤载荷一致;Z-pin增强T型接头在拉伸破坏过程中相比于无增强接头吸收能量多13.74倍。
关键词:    Z-pin增强    T型接头    桥接牵引    黏聚区模型    分层破坏   
Damage Evolution of Z-Pin Reinforced Composite T-Joint Based on Simplified Bridging Traction Model
Ma Yu'e1,2, Du Yonghua1, Xu Panfu1
1. College of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China;
2. State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an 710049, China
Abstract:
Z-pinned composite T-joint is reinforced by inserting thin metal or composite rods through the skin-flange section during manufacturing. Its mechanical properties are improved by bridging traction of Z-pin. ABAQUS software was used to build 3D numerical models of unpinned and z-pin reinforced T-joints. Based on cohesive zone approach, a new simplified bridging traction model of pins was developed to model the reinforcing process of Z-pins. The damage evolutions of unpinned and Z-pinned T-joints were respectively simulated. The tensile ultimate strength and total damage dissipation energy were calculated. And load-displacement curves and dissipation energy-displacement curves of unpinned and Z-pinned composite joints were compared. They agree with the results from references. It is shown that the ultimate load and displacement of Z-pinned joints are respectively 66% and 304% higher than their unpinned ones. At the beginning of damage, the slopes of load-displacement curves seem to be similar before the unpinned one fractured first. During fracture process, absorption energy of Z-pin reinforced T-joint is about 13.74 times more than that of unpinned one.
Key words:    ABAQUS    calculations    computer simulation    crack propagation    energy absorption    finite element method    mathematical models    mechanical properties    mesh generation    schematic diagrams    stress concentration    three dimensional    bridging traction    cohesive zone approach    damage evolution    T-joints    Z-pinned   
收稿日期: 2014-10-30     修回日期:
DOI:
基金项目: 西安交通大学机械结构强度与振动国家重点实验室开放课题与中央高校基本科研业务费专项资金(310201401JCQ01013)资助
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作者简介: 马玉娥(1975—),女,西北工业大学教授,主要从事结构强度、复合材料结构和热结构研究。
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