Abstract The non-invasive monitoring of crack initiation and growth processes within snow, a poro-composite matrix, could be useful to predict the structural failure of a composite material. Present work is a new approach utilizing the non-invasive technique of acoustic emission (AE) to study the ongoing cracking and failures processes within snow beams which is difficult to visualize in real time. The progressive crack growth within the beams of snow followed by their failures is studied under three point beam bending in relation to AE. In this work, AE detection platform is developed and implemented for non-contact detection of acoustic emissions generated within a beam with the help of specialized needle-type AE waveguides in conjunction to wideband AE acquisition system. The AEs are detected for entire course of bending, crack nucleation, crack growth and rupture of the beams, both under static and dynamic load conditions. The crack initiation and growth in snow beams were generated without any predefined notch on its surface in a controlled and perceptible manner, particularly at low deformation rates (

中文翻译：

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与声发射响应相关的雪的三点梁弯曲裂纹扩展和断裂能估计

摘要 雪（一种多孔复合基体）内裂纹萌生和生长过程的无创监测可用于预测复合材料的结构失效。目前的工作是一种利用非侵入性声发射 (AE) 技术来研究难以实时可视化的雪梁内持续开裂和失效过程的新方法。在与 AE 相关的三点梁弯曲下，研究了雪梁内的渐进裂纹扩展以及随后的故障。在这项工作中，AE 检测平台被开发和实施，用于非接触式检测光束内产生的声发射，借助专门的针型 AE 波导与宽带 AE 采集系统相结合。AE 在弯曲、裂纹成核、在静态和动态载荷条件下，梁的裂纹扩展和断裂。雪梁中的裂纹萌生和扩展是在其表面没有任何预定义缺口的情况下以可控和可察觉的方式产生的，特别是在低变形率下