摘要
介绍一种判断C/C编织复合材料损伤程度的新方法——使用撞击计数和振铃计数在结构静加载过程中的相关曲线,判断其损伤程度的严重性。通过监测1组C/C复合材料结构的静力强度试验,发现声发射中撞击计数和振铃计数的相关增长曲线与结构的损伤程度相关:该曲线脱离之前的良好线性关系,突然出现明显拐点,意味着较严重损伤的发生。此时载荷与破坏载荷的比值,对于一定结构比较稳定。该方法可以比较准确有效地预警复合材料结构的破坏,并给出破坏载荷的估计值;这个现象对分析解释复合材料结构损伤场的发展也有一定的启示。
A new method to evaluate the damage extent of composite material structure is presented： determine the severity of damage extent from the relative curve of hits and counts of AE, attained from static load procedure of structure. We find that the ascending curve of counts and hits is related to the damage extent of structure by monitoring a series of static load test of C/C composite structure： the curve deviate from its prior linearity and deflection point appeared in a sudden when more severe damage occurred; and the ratio of load at this time to the final fracture load is steady for a certain structure. This method could early warn the failure of composite structure effectively and estimate the fracture load. This phenomenon could also provide some suggestion to interpret the evolution of damage field of composite structure.
出处
《导弹与航天运载技术》
北大核心
2013年第6期71-74,共4页
Missiles and Space Vehicles
关键词
C
C复合材料
静力加载
损伤
声发射
破坏预警
C/C composite material
Static load experiment
Damage
Acoustic emission
Early warn of failure
