A frameless picture frame test with embedded sensor: Mitigation of imperfections in shear characterization of woven fabrics
A frameless picture frame test with embedded sensor: Mitigation of imperfections in shear characterization of woven fabrics
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DOI：
10.1016/j.compstruct.2018.11.096
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发表时间：
2019-03
影响因子：
6.3
通讯作者：
H. Montazerian;A. Rashidi;M. Hoorfar;A. Milani
中科院分区：
文献类型：
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作者：
H. Montazerian;A. Rashidi;M. Hoorfar;A. Milani
画框剪切试验是机织物剪切性能测试的常用方法。在本研究中，在PFT可能的缺陷，所产生的操作员错误在样品安装过程中，夹具的不对准和织物内的固有的不均匀性的主要来源，审查和建模使用的运动学以及连续的方法。根据对这些模型的新理解，设计了一种新的测试方法，其中剪切框架边界条件在样品制备期间被刻在织物样品本身上;代替制造和安装金属相框。新的无框画框（FPF）测试被证明可以有效地减轻缺陷，并提供了一个简单的操作和更好的控制和织物安装和变形的均匀性。与传统的PFT相反，FPF中的弯曲行为和归一化力响应与传统的偏置拉伸测试一致，没有接近臂的纤维弯曲，同时在加载和卸载阶段均显示出优异的上级测试重复性。最后，一个机械兼容的，可拉伸的传感器被开发和集成到织物样品监测和验证诱导局部变形沿着纱线在不同的测试方法。
Picture frame test (PFT) is frequently employed for characterizing the shear behavior of woven fabrics. In the present study, the main sources of possible imperfections in the PFT, arising from the operator error during sample installation, to the fixture misalignment and the inherent non-uniformities within the fabric, are reviewed and modeled using the kinematic as well as continuum-based approaches. Upon new understandings from these models, a new test methodology was designed where the shearing frame boundary condition is inscribed on the fabric sample itself during sample preparation; in lieu of fabricating and installing a metallic picture frame. The new frameless picture frame (FPF) test was proven to effectively mitigate the imperfections and provide a simple operation and better control and uniformity of the fabric installation and deformation. Contrary to the conventional PFT, the wrinkling behavior and normalized force response in the FPF was in agreement with the conventional bias extension test, with no close-to-arm fiber bending, while showing a superior test repeatability at both loading and unloading stages. Finally, a mechanically compatible, stretchable sensor was developed and integrated into the fabric samples to monitor and verify the induced local deformation along the yarns under different test methods.