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arXiv 1906.07048cond-mat.softphysics.app-ph
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用体积控制的空腔膨胀法捕捉应变刚化

Capturing Strain Stiffening Using Volume Controlled Cavity Expansion

Shabnam Raayai-Ardakani, Tal Cohen

摘要:

应变硬化是肝脏和脑组织等软生物材料中的一种有据可查的行为。测量和表征这种非线性响应,这通常被认为是一种预防损伤的机制,对于工程师设计更好的仿生材料和医生诊断目的具有极大的兴趣。然而,探索软材料或生物材料在其自然环境中大变形时的弹性响应是一项艰巨的任务。在这里,我们提出的体积控制腔膨胀(VCCE)技术作为一种体内测量方法,提供的能力,除了确定其剪切模量的材料的硬化响应的特征。通过采用最小的本构表示,只涉及两个常数(穆尼-里夫林,根特,和奥格登),我们表明,对于传统的PDMS样品,这种技术和伴随的数据分析方法捕获的剪切模量,以及提供可靠的措施的样品的硬化行为。

英文摘要:

Strain-stiffening is a well-documented behavior in soft biological materials such as liver and brain tissue. Measuring and characterizing this nonlinear response, which is commonly considered as a mechanism for damage prevention, is of great interest to engineers for design of better biomimetic materials, and to physicians for diagnostic purposes. However, probing the elastic response of soft or biological materials at large deformation in their natural habitat, is an arduous task. Here, we present the Volume Controlled Cavity Expansion (VCCE) technique as an in-vivo measurement method that offers the ability of characterizing the stiffening response of materials in addition to identifying their shear modulus. By employing minimal constitutive representations involving only two constants (Mooney-Rivlin, Gent, and Ogden) we show that for the conventional PDMS samples, this technique and an accompanying data analysis method capture the shear modulus, as well as providing reliable measures of the stiffening behavior of the samples.

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