含缺陷陶瓷基复合材料L形构件承载性能及破坏过程  

The bearing capacity and the damage process of the ceramic matrix composites L-shaped specimens with defects

作　　者：周俊辰 耿谦[2] 段玉斌 王栋梁 ZHOU Junchen;GENG Qian;DUAN Yubin;WANG Dongliang(Norinco Group Testing and Research Institute,Weinan 714200,China;Shannxi Key Laboratory of Environment and Control for Flight Vehicle,State Key Laboratory for Strength and Vibration of Mechanical Structures,School of Aerospace Engineering,Xi’an Jiaotong University,Xi’an 710049,China;State Key Laboratory of Mechanical System and Vibration,Robotics Institute,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]中国兵器工业试验测试研究院,渭南714200 [2]西安交通大学、航天航空学院机械结构强度与振动国家重点实验室、先进飞行器服役环境与控制陕西省重点实验室,西安710049 [3]上海交通大学、机械与动力工程学院机器人研究所、机械系统与振动国家重点实验室,上海200240

出　　处：《复合材料科学与工程》2023年第6期37-43,共7页Composites Science and Engineering

摘　　要：本文基于图像重构技术,构建了陶瓷基复合材料代表性体积单胞及L形构件的有限元模型,预测了陶瓷基复合材料的弹性模量。通过试验和数值仿真,研究了强制拉伸位移作用下L形构件的承载性能及破坏过程。结果表明,在缺陷对构件承载性能的影响规律方面,仿真结果与试验结果一致性较好,两者相差约10%。L形构件内侧圆角区域主要承受拉伸作用,外侧主要承受压缩作用。内侧缺陷影响试样的承载性能,承载性能随缺陷面积的增大而降低;而外侧缺陷会影响试样的破坏过程,微观缺陷会扩展为宏观破坏,以材料脱层为主。本文的研究方法与结果可为陶瓷基复合材料典型构件承载性能的测试与分析提供参考。Based on the image reconstruction technology,we develop finite element models of the representative volume and L-shaped specimens of ceramic matrix composites,through which the elastic modulus of ceramic matrix composites is predicted.With a combination of numerical simulations and experiments,the bearing capacity and damage process of L-shaped specimens under tensile are studied.The results show that experiment and simulation results are in good consistency regarding the influence of defects on the bearing capacity,and the quantity difference is about 10%.The inner corner of specimens is mainly subjected to tension,while the outside area is subjected to compression.Defects on the inner corner affect the bearing capacity of specimens.The bearing capacity degrades as the defect area broadens.However,defects on the outside of specimens affect the damage process.Microscopic defects propagate and eventually lead to macroscopic failures of the specimen,mainly in the form of material delamination.This study can provide a reference for the testing and analysis of the bearing capacity of ceramic matrix composites.

关 键 词：陶瓷基复合材料 L形构件 承载性能 破坏过程 强度分析 准静态加载 

分 类 号：TB332[一般工业技术—材料科学与工程]