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首页> 美国卫生研究院文献>Materials >The Acoustic Emission Method Implementation Proposition to Confirm the Presence and Assessment of Reinforcement Quality and Strength of Fiber–Cement Composites
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The Acoustic Emission Method Implementation Proposition to Confirm the Presence and Assessment of Reinforcement Quality and Strength of Fiber–Cement Composites

机译：声发射方法的实施主张以确认增强质量和纤维 - 水泥复合材料的强度的存在和评估

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This article proposes to use the acoustic emission (AE) method to evaluate the degree of change in the mechanical parameters of fiber–cement boards. The research was undertaken after a literature review, due to the lack of a methodology that would allow nondestructive assessment of the strength of cement–fiber elements. The tests covered the components cut out from a popular type of board available on the construction market. The samples were subjected to environmental (soaking in water, cyclic freezing–thawing) and exceptional (burning with fire and exposure to high temperature) factors, and then to three-point bending strength tests. The adopted conditions correspond to the actual working environment of the boards. When applying the external load, AE signals were generated, which were then grouped into classes, and initially assigned to specific processes occurring in the material. The frequencies occurring over time for the tested samples were also analysed, and microscopic observations were made to confirm the suppositions based on the first part of the tests. Comparing the results obtained from a group of samples subjected to environmental and exceptional actions, significant differences were noted between them, which included the types of recorded signal class, the frequency of events, and the construction of the microstructure. The degradation of the structure, associated with damage to the fibers or their complete destruction, results in the generation under load of AE signals that indicate the uncontrolled development of scratches, and a decrease in the frequency of these events. According to the authors, the methodology used allows the control of cement–fiber boards in use. The registration and analysis of active processes under the effect of payloads makes it possible to distinguish mechanisms occurring inside the structure of the elements, and to formulate a quick response to the situation when the signals indicate a decrease in the strength of the boards.
机译：本文建议使用声发射（AE）方法来评估纤维板的机械参数的变化程度。由于缺乏缺乏对水泥 - 纤维元素强度的无损评估，在文献综述之后进行了该研究。该测试涵盖了在建筑市场上可用的流行板块切出的部件。将样品进行环境（在水中浸泡，循环冷冻解冻）和特殊的（用火和暴露于高温燃烧）的因子，然后进行三分弯曲强度试验。所采用的条件对应于董事会的实际工作环境。当应用外部负载时，产生AE信号，然后将其分组为类，并且最初分配给材料中发生的特定过程。还分析了随时间发生的频率，并进行微观观察，以基于测试的第一部分确认假设。比较从经过环境和特殊行动的一组样品获得的结果，它们之间的显着差异，其中包括记录信号类的类型，事件的频率和微观结构的构造。与纤维的损坏或其完全破坏相关的结构的降解导致载于AE信号的负载的产生，该信号表示划痕的不受控制的开发，以及这些事件的频率的减小。根据作者，所用方法允许控制使用的水泥 - 纤维板。在有效载荷的效果下的主动过程的登记和分析使得可以区分在元件的结构内发生的机制，并且当信号表明电路板的强度降低时，可以快速地响应情况。

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