Huzni Syifaul, Ikramullah Ikramullah, Ibrahim Israr B M, Fonna Syarizal, Sukhairi Teuku Arriessa, Afrizal Andri, Muksin Umar, H P S Abdul Khalil, Aprilia Sri, Rizal Samsul
Department of Mechanical and Industrial Engineering, Universitas Syiah Kuala, Darussalam, Banda Aceh 23111, Indonesia.
Department of Physics, Universitas Syiah Kuala, Darussalam, Banda Aceh 23111, Indonesia.
Polymers (Basel). 2022 Mar 2;14(5):1006. doi: 10.3390/polym14051006.
The microbond test of natural fibers tends to produce scattered interfacial shear stress (IFSS) values. The sources of this scattering are known, but the roles they play in producing high IFSS scattering remain to be investigated. In this study, a numerical method was used to simulate microbond testing and to examine the experimental parameters in a microbond test of fiber/epoxy. Three parameters were considered: fiber diameter, fiber length embedded in the epoxy, and the distance between the vise and the specimen. The geometries were modeled and analyzed by ABAQUS software using its cohesive zone model features. There were two types of contact used in this analysis: tie constraint and surface-to-surface. The results showcased the roles of the following experimental parameters: a larger fiber diameter from a sample increased the IFSS value, a longer embedded length reduced the IFSS value, and a shorter vise-specimen distance increased the IFSS value. The IFSS scattering in the microbond test could have originated from the interaction between these parameters. Of the three parameters, only the vise-specimen distance was found to be able to be reasonably controlled. When the IFSS value was atypically large, fiber diameter and/or embedded length potentially drove the scattering. This study advises further compilation and classification of the role of each experimental parameter in modulating the IFSS value.
天然纤维的微粘结试验往往会产生分散的界面剪切应力（IFSS）值。这种分散的来源是已知的，但它们在产生高IFSS分散中所起的作用仍有待研究。在本研究中，使用一种数值方法来模拟微粘结试验，并研究纤维/环氧树脂微粘结试验中的实验参数。考虑了三个参数：纤维直径、嵌入环氧树脂中的纤维长度以及虎钳与试样之间的距离。使用ABAQUS软件的粘结区模型功能对几何形状进行建模和分析。该分析中使用了两种类型的接触：绑定约束和面对面接触。结果展示了以下实验参数的作用：样品中较大的纤维直径会增加IFSS值，较长的嵌入长度会降低IFSS值，较短的虎钳 - 试样距离会增加IFSS值。微粘结试验中的IFSS分散可能源于这些参数之间的相互作用。在这三个参数中，仅发现虎钳 - 试样距离能够得到合理控制。当IFSS值异常大时，纤维直径和/或嵌入长度可能导致分散。本研究建议进一步汇编和分类每个实验参数在调节IFSS值中的作用。
