Concentration Dependence of Tensile Behavior in Agarose Gel Using Digital Image Correlation
Concentration Dependence of Tensile Behavior in Agarose Gel Using Digital Image Correlation
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DOI：
10.1007/s11340-010-9354-2
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发表时间：
2011-02-01
影响因子：
2.4
通讯作者：
Haile, M. A.
中科院分区：
文献类型：
--
作者：
Subhash, G.;Liu, Q.;Haile, M. A.
由于与夹持方法和轴向和横向应变的精确测量相关的困难，软滑生物材料的拉伸测试是一项具有挑战性的任务。在这篇手稿中，上述问题得到了有效的解决，分别使用肩支撑拉伸试样和数字图像相关（DIC）技术。使用上述方法测定浓度范围为1.5至4.0重量%的琼脂糖凝胶的拉伸响应。与以前的文献中的拉伸应变是从机器的十字头位移，DIC技术利用引入到计量区域的散斑图案，以获得轴向和横向应变的全场地图。结果表明，琼脂糖凝胶的拉伸强度和模量随琼脂糖浓度的增加而线性增加。原始试样的泊松比确定为约0.5，并且随着轴向应变略微降低，这可能是由于变形期间的水损失。
Tensile testing of soft, slippery biological materials is a challenging task due to the difficulties associated with the gripping method and accurate measurement of axial and lateral strains. In this manuscript, the above issues were effectively resolved by using a shoulder-supported tensile specimen and digital image correlation (DIC) technique, respectively. The tensile response of agarose gel with concentration ranging from 1.5 to 4.0 wt% was determined using the above method. Unlike the previous literature where the tensile strain was obtained from machine crosshead displacement, the DIC technique utilized a speckle pattern introduced into the gage area to obtain full-field maps of axial and lateral strains. It is found that the tensile strength and modulus of agarose gel increases linearly with an increase in agarose concentration. The Poisson's ratio was determined to be around 0.5 for virgin specimens and it decreased slightly with axial strain, possibly due to the loss of water during deformation.