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A NEW METHOD TO EVALUATE THE DAMAGE EXTENT OF C/C COMPOSITE MATERIAL STRUCTURE USING ACOUSTIC EMISSION TECHNOLOGY

机译：利用声发射技术评估C / C复合材料结构损伤范围的新方法

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摘要

A new method to evaluate the damage extent of composite material structure is presented in this paper-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.
机译：本文提出了一种评估复合材料结构损伤程度的新方法，根据结构的静载荷过程，通过碰撞的相对曲线和声发射计数确定损伤程度的严重性。通过监测C / C复合结构的一系列静载荷试验，我们发现计数和命中的上升曲线与结构的破坏程度有关：该曲线偏离其先前的线性，并且在更严重的情况下突然出现偏转点发生损坏;对于特定结构，此时的载荷与最终断裂载荷之比是稳定的。该方法可以早期有效地警告复合材料结构的破坏，并估计断裂载荷。这种现象也可能为解释复合结构损伤场的演变提供一些建议。

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