摘要
复合材料结构在特殊载荷作用下表现出不同的力学承载性能,这一因素将对其在不同速度载荷作用下的力学性能造成一定的影响,了解并研究复合材料结构在不同加载速率作用下的力学性能及内部缺陷和损伤演化规律,对于正确评估其承载性能具有现实意义。对同批次玻璃纤维编织复合材料试件进行三种加载速率作用下的拉伸力学性能试验,通过研究复合材料试件承载性能、损伤状态与加载速率的关系,分析了内部损伤演化对承载能力的影响。采用声发射技术监测复合材料试件损伤过程,分析了声发射信号能量与加载速率的关系,同时从声发射波形历程和破坏时声发射信号特征角度分析了玻璃纤维编织复合材料损伤演化规律。结果表明,随加载速率的增加试件抗拉强度增大;加载速率高低影响复合材料内部损伤的扩展行为,在较低的加载速度下,内部损伤有较长的时间进行充分扩展,从而使复合材料结构的完整性降低,表现为破坏时的部分结构承载;在较高的加载速率下,内部损伤扩展不均匀,反而保持了复合材料结构的相对完整性,表现为较高的拉伸强度。
The composite structure shows different mechanical bearing properties under the special load,which will have a certain effect on its mechanical properties under the action of different velocity loads,and it is of practical significance to understand and study the mechanical properties of composite structures under different loading rate and the laws of internal defects and damage evolution.The performance tests of stretch mechanics under the action of three loading rate of the same batch glass fiber woven composite material were carried out,and the effect of internal damage evolution on the mechanics performances was analyzed by studying the relationship between the bearing performance,damage state and loading rate of the composite material.The process of monitoring the damage of the composite material was carried out with acoustic emission technology,and the relationship between the acoustic emission energy and loading rate was analyzed.At the same time,the damage and failure evolution law of fiberglass woven composite was analyzed from the perspective of the process of acoustic emission waveform and the characteristics of the acoustic emission signal during destruction.The results show that with the more higher of the loading rate,the more stronger of the tensile strength of the composite is,and that the loading rate affects the expansion behavior of the internal damage of composites,under the lower loading rate,the internal damage has a long time to fully expand,so that the composite structure of the uniformity is reduced,as a part of the structure subject to the tensile load.At higher loading rates,the internal damage spread is uneven,but instead maintains the relative integrity of the composite structure,showing higher tensile strength.
作者
刘武刚
张敬义
王龙
侯传涛
任方
LIU Wu-gang;ZHANG Jing-yi;WANG Long;HOU Chuan-tao;REN Fang(Beijing Institute of Structure and Environment Engineering,Science and Technology on Reliability and Environment Engineering Laboratory,Beijing 100076,China;Aerospace Research Institute of Materials and Processing Technology,Beijing 100076,China)
出处
《强度与环境》
CSCD
2020年第4期27-32,共6页
Structure & Environment Engineering
基金
重点实验室基金(WDZC2019601A309)
航天科技自主研发项目。
关键词
拉伸加载速率
玻璃纤维编织复合材料
力学性能
声发射
损伤演化
tensile loading rate
glass fiber woven composite
mechanical property
acoustic emission
damage evolution
