光纤智能复合材料损伤行为的跨尺度耦合分析  

Cross-scale coupling analysis of damage behavior of optical fiber smart composites

作　　者：田云博 罗利龙[2] 张芸倩 孟军辉 Tian Yunbo;Luo Lilong;Zhang Yunqian;Meng Junhui(School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China;Aircraft Strength Research Institute of China,Xi’an 710065,China;National Key Laboratory of Strength and Structural Integrity,Aircraft Strength Research Institute of China,Xi’an 710065,China;Chongqing Innovation Center,Beijing Institute of Technology,Chongqing 401135,China)

机构地区：[1]北京理工大学宇航学院,北京100081 [2]中国飞机强度研究所,西安710065 [3]中国飞机强度研究所强度与结构完整性全国重点实验室,西安710065 [4]北京理工大学重庆创新中心,重庆401135

出　　处：《空天技术》2024年第1期10-16,35,共8页Aerospace Technology

基　　金：工信部民机专项(MJZ3-2N21);北京理工大学科技创新计划(2021CX01018)。

摘　　要：将光纤传感器埋入复合材料可以长期在线监测复合材料结构内部的变形及损伤情况,从而实现对结构的监测和寿命预测。然而光纤的埋入会在一定程度上损坏基体材料的完整性和连续性,导致部分基体在原复合材料和光纤之间形成界面并产生较高的应力集中,从而对复合材料力学性能带来负面影响。为研究光纤等细微结构对复合材料宏观力学性能的影响,采用跨尺度耦合分析的方法,通过应变场的局部化以及均匀化两个过程,将复合材料的宏观尺度模型与细观尺度模型耦合在一起,研究光纤智能复合材料受拉伸载荷的力学响应与损伤演化规律,并讨论了光纤直径、界面结构的细观尺寸参数对于智能复合材料力学性能的影响规律。结果表明,随着光纤直径的增加,复合材料的刚度下降,应力集中系数提高,拉伸强度下降;随着树脂富集区长度的增加,复合材料的刚度下降,应力集中系数下降,强度提高。Optical fiber sensors are often embedded into composites to provide long-term,real-time monitoring of deformation and damage.Previous studies have shown that the embedding of optical fibers can compromise the integrity and continuity of the matrix material,leading to the formation of matrix-fiber interfaces and high stress concentrations that have a negative impact on the mechanical properties of the composite.Using a cross-scale methodology,we investigated the effect of microstructures such as optical fibers on the macroscopic mechanical properties of composites.Through the two processes of localization and homogenization of the strain field,we coupled the macro scale model of the composite with the micro scale model.The mechanical response and progressive failure laws of composites under tensile loading with respect to the fiber diameter,the fine size parameter pairs of the interfacial structure have been investigated.The findings indicated that as the fiber diameter increases,the stiffness of the composite material decreases,stress concentration coefficient increases,and tensile strength decreases.Similarly,as the length of the resin-rich zone increased,the stiffness of the composite material decreased,the stress concentration coefficient decreased,and the strength increased.

关 键 词：跨尺度分析 光纤智能复合材料 复合材料损伤 渐进失效 强度分析 

分 类 号：V214.8[航空宇航科学与技术—航空宇航推进理论与工程]