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首页> 外文会议>Conference on Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation >Acoustic Emission to track the damage progress on thin-wall large-scale cement composites: damage mode and the effect of wave attenuation at intact and damage state
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Acoustic Emission to track the damage progress on thin-wall large-scale cement composites: damage mode and the effect of wave attenuation at intact and damage state

机译：声发射跟踪薄壁大型水泥复合材料上的损伤进展：损伤模式和波衰减在完整和损伤状态下的效果

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The damage evolution on thin-wall large-scale textile-reinforced cement composite structural elements loaded under bending is tracked in this study using acoustic emission. The monitoring technique has been extensively applied in recent decades for the structural health assessment of voluminous and bulk concrete structures, still its performance and efficacy on thin elements is not extensively investigated. In a well-established approach today, the AE waveform is analyzed based on a series of wave features. Indicatively, the damage progress is tracked based on AE energy and correlated to the mechanical properties (load, displacement). AE source localization detects and pinpoints the zones where cracks and internal debonding occur indicating the damage shift from the middle bending span to the edges of the beam. Based on this observation, the rise time and frequency analyses pinpoint the effect of source-sensor distance on the wave shape. This latter result is discussed considering a preliminary attenuation analysis at intact and damage state. The RA-value and frequency trends are also reported in an attempt to relate the research outcome to the Rilem TC 212-ACD protocol. It is shown that the AE inspection accuracy does not diminish due to thin-wall geometry, still taking into account of the attenuation effect at both intact and damage state is recommended.
机译：使用声发射，在该研究中跟踪了在弯曲下装载的薄壁大型纺织品增强水泥复合结构元件的损伤演化。近几十年来广泛应用监测技术对大量和散装混凝土结构的结构健康评估，仍然没有广泛研究其对薄元素的性能和功效。在今天的一种完善的方法中，基于一系列波形特征分析AE波形。另称，基于AE能量跟踪损伤进度，并与机械性能（负载，位移）相关。 AE源定位检测并定位发生裂缝和内部剥离的区域，该区域显示从中间弯曲跨度到光束边缘的损伤。基于该观察，上升时间和频率分析确定了源传感器距离对波形的影响。考虑到完整和损坏状态的初步衰减分析，讨论后一种结果。还报告了RA值和频率趋势试图将研究结果与RILEM TC 212-ACD协议相关联。结果表明，由于薄壁几何形状，AE检查精度不会减少，仍在考虑到完整和损坏状态的衰减效果。

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