摘要
研究混凝土梁受三点弯曲负荷时的声发射 ( AE)特性。结果表明在加载初期裂缝在混凝土中的形成和扩展是间歇的 ,达到临界状态后裂缝的扩展呈失稳 ;切口相对深度对混凝土梁声发射特性有着显著影响 ,切口相对深度增大 ,声发射事件突发性明显减小 ,表明其材料的脆性程度降低。
The acoustic emission (AE) characteristics of the three point bended concrete beams with notches of different relative depths were studied during the entire loading period. It was shown that the cracks formed and extended discontinuously at the inception of loading and the extension was out of stable in the state of critical loading. The relative depths of the notches affected AE characteristics obviously. The occurrence of AE events decreased greatly with the increasing of the relative depths of the notches. It meant that the brittleness of concrete decreased. The inner cracks could be located by means of AE technology.
出处
《无损检测》
2000年第3期109-111,共3页
Nondestructive Testing
关键词
声发射特性
弯曲负荷
混凝土
裂纹
Acoustic emission characteristic Bending load Concrete Crack
