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在力学试验研究中,采用声发射技术对已具有疲劳裂纹的核反应堆一回路模拟压力管进行加载爆破断裂的监测。利用声发射所具备的特征,研究试件在加载过程中裂纹从开裂直到断裂的动态过程。用声发射所表征的参数来解释在加载过程中各阶段的力学特征,弥补了常规力学测试方法的不足,从而观察了带有疲劳裂纹的试件其“开裂前兆-开裂-扩展-块速断裂”的全部过程,并给出各阶段的压力值。试验过程中采用微机进行实时数据处理。给出监测结果并确定出断裂位置。所得数据可用于反应堆承压构件的力学分析。
In the mechanics test research, acoustic emission technique was used to monitor the loaded blasting fracture of the first-line simulated pressure tube of a nuclear reactor which had fatigue cracks. The characteristics of acoustic emission are used to study the dynamic process of cracks during the loading process from cracking to breaking. The parameters characterized by AE were used to explain the mechanical characteristics of each stage during the loading process to make up for the shortcomings of the conventional mechanical testing methods. The specimens with fatigue cracks were observed as “crack precursors - cracking - spreading - mass rapid fracture ”The whole process, and gives the pressure value of each stage. During the experiment using computer for real-time data processing. Given the monitoring results and determine the location of the fracture. The data obtained can be used for the mechanical analysis of reactor pressure components.