CAJ | 학술논문

针对声发射技术对金属结构损伤的检测可靠性问题，以金属疲劳裂纹检测试验为基础，利用声发射特征参数的趋势分析和关联分析法，首先根据贝叶斯理论，计算了声发射对一定长度疲劳裂纹的检测概率；其次，研究了检测结构起裂时对应声发射幅度参数的阈值及其对损伤判断的影响。该研究可为减少声发射检测中的金属疲劳损伤信号误判，提高检测效率，以及确定复杂航空结构疲劳寿命提供支持。
침대성발사기술대금속결구손상적검측가고성문제，이금속피로렬문검측시험위기출，이용성발사특정삼수적추세분석화관련분석법，수선근거패협사이론，계산료성발사대일정장도피로렬문적검측개솔；기차，연구료검측결구기렬시대응성발사폭도삼수적역치급기대손상판단적영향。해연구가위감소성발사검측중적금속피로손상신호오판，제고검측효솔，이급학정복잡항공결구피로수명제공지지。
Aiming at calculating the monitoring probability and reliability of metal damage based on Acoustic E-mission ( AE) , it takes the metal fatigue tests as an example , utilizes the trend analysis and correlative analysis of AE characteristics to calculate the monitoring probability of fatigue crack with a certain length .Then it resear-ches the thresholds of signal amplitude which indicate the structural damage , analyzes their influences on struc-tural damage .Results indicate that AE can predict the metal fatigue crack .This method can help decreasing the damage signal miscarriage of justice , improving the monitoring efficiency , also support for the ascertainment of structure fatigue life .