Modeling resistance increase in a composite ink under cyclic loading
Modeling resistance increase in a composite ink under cyclic loading
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DOI：
10.1088/2058-8585/acbaab
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发表时间：
2023-02
影响因子：
3.1
通讯作者：
Qiushi Li;Euichul Chung;Antonia Antoniou;Olivier N Pierron
中科院分区：
文献类型：
--
作者：
Qiushi Li;Euichul Chung;Antonia Antoniou;Olivier N Pierron
可拉伸电子墨水的电性能随着它们在使用期间经历循环变形而降低，这对其可靠性构成了重大挑战。油墨疲劳行为的实验表征可能是一个耗时的过程，并且需要允许精确的电阻演变和寿命估计的模型。在这里，提出了一个模型，用于确定在循环加载的丝网印刷复合导电油墨的电阻演变。该模型依赖于两个输入的应变特性曲线，假设一个恒定的速率归一化电阻增加一个给定的应变振幅，并结合了平均应变和应变振幅的影响。该模型预测的归一化电阻演变的循环测试具有合理的精度。除了大应变幅（>10%）和平均应变（>30%）外，平均应变效应比应变幅次要。发现1 mm与2 mm宽试样的疲劳行为存在迹线宽度效应。输入的双折射特性曲线是迹线宽度相关的，该模型预测的N f的减少由一个因素高达2的较窄的迹线宽度，与实验结果一致。两种不同的方法进行了研究，以产生率的归一化电阻增加曲线：不间断疲劳试验（需要106 -7个循环测试），和一个单一的中断循环测试（只需要一个样本进行测试，在逐步更高的应变振幅值）。结果表明，在归一化电阻率的初始下降只发生在没有事先加载的标本。因此，建议使用最小速率曲线进行更准确的疲劳估计。
The electrical performance of stretchable electronic inks degrades as they undergo cyclic deformation during use, posing a major challenge to their reliability. The experimental characterization of ink fatigue behavior can be a time-consuming process, and models allowing accurate resistance evolution and life estimates are needed. Here, a model is proposed for determining the electrical resistance evolution during cyclic loading of a screen-printed composite conductive ink. The model relies on two input specimen-characteristic curves, assumes a constant rate of normalized resistance increase for a given strain amplitude, and incorporates the effects of both mean strain and strain amplitude. The model predicts the normalized resistance evolution of a cyclic test with reasonable accuracy. The mean strain effects are secondary compared to strain amplitude, except for large strain amplitudes (>10%) and mean strains (>30%). A trace width effect is found for the fatigue behavior of 1 mm vs 2 mm wide specimens. The input specimen-characteristic curves are trace-width dependent, and the model predicts a decrease in N f by a factor of up to 2 for the narrower trace width, in agreement with the experimental results. Two different methods are investigated to generate the rate of normalized resistance increase curves: uninterrupted fatigue tests (requiring ∼6–7 cyclic tests), and a single interrupted cyclic test (requiring only one specimen tested at progressively higher strain amplitude values). The results suggest that the initial decrease in normalized resistance rate only occurs for specimens with no prior loading. The minimum-rate curve is therefore recommended for more accurate fatigue estimates.