Light emitting composite beams during matrix cracking
Light emitting composite beams during matrix cracking
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基体破裂期间发光复合光束
DOI：
10.1177/0021998317701556
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发表时间：
2017
影响因子：
2.9
通讯作者：
Arda Vanli
中科院分区：
文献类型：
--
作者：
Kunal Joshi;Spandan Mishra;C. Campbell;Tarik J. Dickens;Arda Vanli
纤维增强复合材料结构中的缺陷往往由于复合材料结构内的局部应力集中而不可预测地和不受警告地开始;这引起了主动监测技术，该技术可以量化复合材料内的机械应力以评估结构健康。本文将摩擦发光机理用于复合材料基体在弯曲载荷下的损伤监测。在乙烯基酯树脂中掺杂ZnS：Mn荧光粉，并用玻璃纤维晶须增强，分别用光电倍增管（PMT）和微型传声器观察其摩擦发光和声学响应。通过单独的波形分析的玻璃纤维/乙烯基酯树脂复合材料的结构完整性的摩擦发光发射的有效性进行了检查。通过捕获的波形和观察到的摩擦发光发射来理解失效模式，表明基体开裂失效模式倾向于位于2691-2813 Hz的固有频率范围内。在2800 Hz的频率下，基体开裂时的摩擦发光和声发射信号之间具有很高的相关性，未来的研究将讨论分层和纤维断裂失效模式的摩擦发光和声发射行为。
Defects in fiber-reinforced composite structures tend to initiate unpredictably and unalarmed due to local stress concentrations within a composite structure; this has given rise to active monitoring techniques that can quantify the mechanical stress within composites in order to evaluate the structural health. In this paper, triboluminescent mechanisms are used for damage monitoring of composite matrix under flexural loading. Vinyl ester resin is doped with ZnS:Mn phosphors and reinforced with glass fiber whiskers, were subjected to flexural loading while observing both the triboluminescent and acoustic response using a photo multiplier tube (PMT) and micro-mic respectively. Validity of triboluminescent emissions for determining structural integrity of glass fiber / vinyl ester resin composites through individual waveform analysis was examined. Understanding the failure modes through the captured waveform and observed triboluminescent emissions shows that the matrix cracking failure mode tends to lie in the natural frequency range of 2691–2813 Hz. High correlation between the triboluminescent and acoustic signals at matrix cracking at a frequency of 2800 Hz were found. Future research will discuss the triboluminescent and acoustic emissions behavior for delamination and fiber breakage failure modes.