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Dynamic Visualization of Stress/Strain Distribution and Fatigue Crack Propagation by an Organic Mechanoresponsive AIE Luminogen
Advanced Materials ( IF 29.4 ) Pub Date : 2018-09-10 , DOI: 10.1002/adma.201803924
Zijie Qiu 1, 2, 3 , Weijun Zhao 2, 3 , Mingkui Cao 1 , Yuqi Wang 1 , Jacky W. Y. Lam 2, 3, 4, 5 , Zhe Zhang 1 , Xu Chen 1 , Ben Zhong Tang 2, 3, 4, 5
Affiliation  

Stress exists ubiquitously and is critically important for the manufacturing industry. Due to the ultrasensitive mechanoresponse of the emission of 1,1,2,2,‐tetrakis(4‐nitrophenyl)ethane (TPE‐4N), a luminogen with aggregation‐induced emission characteristics, the visualization of stress/strain distributions on metal specimens with a pure organic fluorescent material is achieved. Such a fluorescence mapping method enjoys the merits of simple setup, real‐time, full‐field, on‐site, and direct visualization. Surface analysis shows that TPE‐4N can form a nonfluorescent, crystalline uniform film on the metal surface, which cracks into fluorescent amorphous fragments upon mechanical force. Therefore, the invisible information of the stress/strain distribution of the metal specimens are transformed to visible fluorescent signals, which generally matches well but provides more details than software simulation. Remarkably, fatigue crack propagation in stainless steel and aluminum alloy can be observed and predicted clearly, further demonstrating the ultrasensitivity and practicability of TPE‐4N.

中文翻译:

通过有机机械响应AIE发光剂动态显示应力/应变分布和疲劳裂纹扩展

压力无处不在,对制造业至关重要。由于1,1,2,2,-四(4-硝基苯基)乙烷(TPE-4N)的发射具有超灵敏的机械响应,这是一种具有聚集诱导发射特性的发光剂,因此可以直观地观察金属样品上的应力/应变分布用纯有机荧光材料即可实现。这种荧光作图方法具有简单设置,实时,全场,现场和直接可视化的优点。表面分析表明,TPE-4N可以在金属表面形成一层无荧光的结晶均匀膜,在机械力作用下会破裂成荧光无定形碎片。因此,金属试样应力/应变分布的不可见信息被转换为可见荧光信号,通常可以很好地匹配,但是比软件仿真提供了更多的细节。值得注意的是,可以清楚地观察到并预测到不锈钢和铝合金中的疲劳裂纹扩展,进一步证明了TPE-4N的超灵敏性和实用性。
更新日期:2018-09-10
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