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arXiv 1607.07360cond-mat.softcond-mat.mtrl-sci
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具有可调弹性的粘性颗粒材料

A cohesive granular material with tunable elasticity

Arnaud Hemmerle, Matthias Schröter, Lucas Goehring

摘要:

通过将玻璃珠与可固化聚合物混合,我们创建了一种定义明确的粘性颗粒介质,通过固化并因此具有弹性的毛细管桥保持在一起。该材料具有类似于珠粒的湿堆积的几何形状,但是具有对将颗粒保持在一起的键的弹性的额外控制。我们表明,它的机械响应可以通过调整桥的大小和刚度,以及颗粒的大小在几个数量级上变化。我们还研究了其无侧限单轴压缩下的破坏机制结合原位x射线显微层析成像。我们表明,一个广泛的线弹性制度结束在一个极限应变约8%,无论团聚体的刚度,这对应于剪切破坏的开始。微调这种简单材料的刚度、尺寸和形状的可能性使其成为研究多孔岩石破裂、地震学或粘性多孔介质中的根生长等问题的理想模型系统。

英文摘要:

By mixing glass beads with a curable polymer we create a well-defined cohesive granular medium, held together by solidified, and hence elastic, capillary bridges. This material has a geometry similar to a wet packing of beads, but with an additional control over the elasticity of the bonds holding the particles together. We show that its mechanical response can be varied over several orders of magnitude by adjusting the size and stiffness of the bridges, and the size of the particles. We also investigate its mechanism of failure under unconfined uniaxial compression in combination with in situ x-ray microtomography. We show that a broad linear-elastic regime ends at a limiting strain of about 8%, whatever the stiffness of the agglomerate, which corresponds to the beginning of shear failure. The possibility to finely tune the stiffness, size and shape of this simple material makes it an ideal model system for investigations on, for example, fracturing of porous rocks, seismology, or root growth in cohesive porous media.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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