In-plane shear behavior of 3D spacer knitted fabrics
In-plane shear behavior of 3D spacer knitted fabrics
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DOI：
10.1177/1528083715601509
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发表时间：
2016-09-01
影响因子：
3.2
通讯作者：
Tunak, Maros
中科院分区：
文献类型：
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作者：
Arumugam, Veerakumar;Mishra, Rajesh;Tunak, Maros
利用相框夹具对3D间隔针织物的剪切性能进行了研究。在加载速率为10 mm/min时，采用三种不同的方法求取剪切角。所有的测试都由一台ccd单色相机记录下来。利用加载过程中采集的图像进行分析，以获得试件表面选定点处的全场位移和剪切角。对相框剪切夹具进行了实验和分析研究，以确定其是否适用于测量3D针织间隔织物的层内剪切性能。在这项工作中，设计了一种夹具来分析这些织物的面内剪切行为。分析了剪切力随剪切角的非线性行为及变形机理。通过考虑两种不同的框架长度，记录了面内剪切试验的剪力与剪切角和屈曲位置的关系曲线，以便进行比较。对层内剪切试验的荷载-位移曲线进行了分析。此外，还利用Hough变换在MatLab中编制了一个程序，用于分析试件在不同位置位移过程中实时图像中的剪切角。将图像分析结果与实际实验结果进行了对比。这些发现对于进一步改进相框夹具的设计和研究3D织物的面内剪切性能具有重要的意义。
The shear behavior of 3D spacer knitted fabrics was investigated by using a picture frame fixture. Three different methods were used to find the shear angle during loading rate of 10mm/min. All the tests were recorded by a CCD monochrome camera. The images acquired during loading process were used for analysis in order to obtain the full-field displacement and shear angles at chosen points on the surface of test specimen. An experimental and analytical investigation of picture frame shear fixture was conducted to determine its suitability for measuring intra-ply shear properties of 3D knitted spacer fabrics. In this work, a fixture was designed to analyze the in-plane shear behavior of these fabrics. The nonlinear behavior of shear force versus shear angle and the deformation mechanism were analyzed. The curves for shear force versus shear angle and position of buckling for in-plane shear test are recorded by considering two different frame lengths in order to compare with each other. Load-displacement curves of intra-ply shear tests are also analyzed. In addition to this, a program was developed in MATLAB using Hough transform to analyze the shear angle in the real-time image taken during displacement of specimen at various positions. The results of image analysis were compared with the actual experimental results. These findings are important requirements for further improvements in designing of picture frame fixture and to study the in-plane shear properties of 3D fabrics.