Volume 36, Number 5, October 2018
|848 - 855
|17 December 2018
Failure Analysis of Composite Pinned Joints Based on Continuum Damage Mechanics
School of Aeronautics, Northwestern Polytechnical University, Xi’an
2 Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
The paper conducted bearing tests on composite pinned joints with four different stacking sequences. The bearing strength and bearing chord stiffness were obtained. The influence of stacking sequences on failure modes, bearing strength and bearing chord stiffness was discussed. Based on continuum damage mechanics, a three-dimensional finite element model of composite pinned joint under bearing load was built, where the maximum strain criterion was employed for initiation and bi-liner damage constitutive relation for revolution of fiber damage, while the physical-based Puck criterion was used for matrix damage initiation, and matrix damage revolution depended on the effective strain on the fracture plane. The failure mode, bearing strength and bearing chord stiffness of composite pinned joint were discussed with this model under which the non-linear shear behavior and in-situ strength effects were considered. Good agreements between test results and numerical simulations validates the accuracy and applicability of the finite element model.
Key words: composite materials / composite pinned joint / bearing strength / continuum damage mechanics / damage evolution / finite element model
关键字 : 复合材料 / 销钉连接 / 挤压强度 / 连续介质损伤力学 / 损伤扩展 / 有限元模型
© 2018 Journal of Northwestern Polytechnical University. All rights reserved.
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