Fracture behavior of wasted activated carbon powder composites
Fracture behavior of wasted activated carbon powder composites
复制标题
废弃活性炭粉末复合材料的断裂行为
DOI：
10.1080/09243046.2015.1011049
复制
发表时间：
2016
影响因子：
2.9
通讯作者：
S. Wakayama
中科院分区：
文献类型：
--
作者：
T. Sakai;Tomohiko Gushiken;C. R. Ríos;T. Masuko;S. Matsushima;Satoshi Kobayashi;S. Yoneyama;S. Wakayama
在水务局(东京都政府)，已经使用了活性碳来过滤水。在用于过滤过程后，通常将其处置或焚烧以进行热回收。然而，在热回收过程中会产生二氧化碳排放。本工作主要研究回收废弃活性碳(WAC)的力学行为，以期开发出具有机电功能的智能材料。声发射技术(AE)被广泛地用作表征载体，在其中安装传感器以检测弯曲试验过程中的微损伤。首先，通过透过性测试测量了试件的共振频率。与体积分数较高的样品相比，含有低质量分数WAC粉末的样品的共振频率较低。利用投影小波变换对弯曲试验中检测到的信号进行了频谱分析。获得的数据显示，通常情况下，第一个主峰显示传感器的共振频率，而第二个主峰显示指示树脂开裂的信号。用光学显微镜对断口进行了分析，以观察弯曲应力作用下复合材料表面裂纹的形成和扩展情况。因此，断口分析和声发射分析可以更好地了解所涉及的失效机制。
At the Waterworks Bureau (Tokyo Metropolitan Government), activated carbon has been used for filtering water. After being used for the filtering process, it is normally disposed or burned for thermal recycling. However, CO2 emissions occur during the thermal recycling. This work focuses on the identification of mechanical behavior of recycled wasted activated carbon (WAC) in order to elaborate smart materials having mechanical–electrical functions. Acoustic emission technique (AE) was used intensively as characterization support in which sensors were attached to detect microdamage during bending tests. At first, the resonant frequencies of the specimens were measured using the through-transmission test. The resonant frequencies of the specimens containing low weight fractions of WAC powder were less in comparison to the frequencies of the specimens with higher volume fraction. The frequency analysis was carried out with the projected wavelet transform on the signals detected during bending tests. Obtained data showed that, typically, the first major peaks showed the resonant frequency of the sensors, while the second major peaks exhibited signals indicative of resin cracking. The surfaces of the fractured specimens were analyzed by optical microscopy in order to visualize the crack formation and propagation on the activated carbon composite under flexural stresses. Consequently, fractographic and AE analyses provide better understanding of the failure mechanisms involved.