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Experimental study and phenomenological modelling of flaw sensitivity of two polymers used as dielectric elastomers
Continuum Mechanics and Thermodynamics ( IF 2.6 ) Pub Date : 2019-08-12 , DOI: 10.1007/s00161-019-00817-8
Dilshad Ahmad , Karali Patra , Mokarram Hossain

The extreme stretching of dielectric elastomers in sensors, actuators and energy harvesting devices is a common phenomenon where the materials are prone to fracture under the influence of flaws and notches. In this work, we have investigated the length of flaw sensitivities of two widely used dielectric materials, acrylic (VHB) and silicone (Ecoflex) elastomers under a pure shear loading and established that the length of flaw sensitivity of acrylic is almost double than that of silicone. Therefore, the acrylic elastomer is safer to operate for small notches as compared to the silicone material. However, within the flaw-sensitive length, failure stretch, fracture toughness and failure stress are more for Ecoflex than those for VHB. It is found that the failure stretch and the fracture toughness decrease drastically after the length of flaw sensitivities for both materials. Also, the failure stress keeps on decreasing with an increase in notch length for both materials. Afterwards, a simple phenomenological relation is proposed for fitting experimental results under a pure shear loading with only two parameters. The mathematical relation is valid for both the materials and covers the notch sensitivity with a good agreement.

中文翻译:

两种用作介电弹性体的聚合物的缺陷敏感性的实验研究和现象学建模

传感器,执行器和能量收集设备中介电弹性体的过度拉伸是一种普遍现象,其中材料在缺陷和缺口的影响下易于断裂。在这项工作中,我们研究了纯剪切载荷下两种广泛使用的介电材料丙烯酸(VHB)和有机硅(Ecoflex)弹性体的缺陷敏感性长度,并确定了丙烯酸的缺陷敏感性长度几乎是普通材料的两倍。有机硅。因此,与硅树脂材料相比,丙烯酸弹性体在较小的缺口处更安全。但是,在缺陷敏感长度内,Ecoflex的破坏拉伸,断裂韧性和破坏应力比VHB更大。发现在两种材料的缺陷敏感性长度之后,破坏拉伸和断裂韧性急剧下降。同样,两种材料的缺口长度都随着断裂应力的增加而不断降低。然后,提出了一种简单的现象学关系,以拟合仅具有两个参数的纯剪切载荷下的实验结果。该数学关系对于两种材料均有效,并且以良好的一致性涵盖了缺口敏感性。
更新日期:2019-08-12
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