论文部分内容阅读
声发射测试技术由于实时、连续、在线监测的特点,被越来越多地应用于材料性能的研究,但由于蠕变实验温度过高,超过传感器使用温度限制,因此在金属材料蠕变损伤领域还尚属空白。本文以Q345R钢为例,设计蠕变声发射监测专用的夹具导波机构,进行Q345R钢蠕变声发射监测实验。监测结果表明,蠕变损伤过程的声发射活动表现出与蠕变曲线相类似的阶段性特征。蠕变初期撞击数较多,声发射较为活跃;随着损伤的演进,试件进入稳态蠕变阶段,声发射活动渐趋平稳,日平均撞击数趋于稳定值;蠕变后期,能量快速释放,声发射活动加剧,试件发生蠕变断裂。
Due to the characteristics of real-time, continuous and on-line monitoring, acoustic emission testing technology is more and more applied to the study of material properties. However, the creep test temperature is too high and exceeds the temperature limit of the sensor. Therefore, in the field of creep damage of metal materials It is still blank. In this paper, Q345R steel, for example, the design creep acoustic emission monitoring fixture dedicated guided wave mechanism for Q345R steel creep acoustic emission monitoring experiments. The monitoring results show that the acoustic emission activity of the creep damage process shows similar stage characteristics to the creep curve. Acoustic emission was more active in the early stage of creep. With the evolution of the damage, the specimen entered the steady-state creep stage, the sound emission activity gradually stabilized and the daily average number of impacts tended to be stable. In the late creep stage, the energy was rapidly Release, acoustic emission activities intensified, the specimen creep rupture.