Approaches on material analysis and modeling of bouncing putty
Approaches on material analysis and modeling of bouncing putty
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弹跳腻子材料分析与建模方法
DOI：
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发表时间：
2014
期刊：
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通讯作者：
L. Zentner
中科院分区：
文献类型：
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作者：
L. Hartmann;R. Reich;U. Kletzin;L. Zentner
本文研究了弹跳腻子的力学性能，并通过流变模型确定了材料参数。弹跳腻子是一种硅树脂聚合物，具有粘弹性，是一种具有膨胀性的非牛顿流体。如果它被扔到一个表面上，它会像弹簧一样弹回来。但如果把它放在桌子上，它就会像粘性流体一样流动。它表现得像弹性材料或像粘性液体的原因是变形的速度。对于膨胀材料，也称为剪切增稠材料，如果应变速率（变形速度）上升，粘度就会增加。由于其非线性的刚度和阻尼特性，这种材料作为一种智能材料在现代工程中非常有趣，特别是在处理扰动振动和动态效应方面。因此，为了将这种材料应用于工程，必须通过力学参数的函数关系来评估非线性弹簧-阻尼行为。但是，确定弹性和粘度并非易事，因为非恒定值是基于实验的，而它们取决于应用的理论模型。基于此，本文建立了一种合适的流变模型来反映减震效应，并提出了一种基于伺服液压试验机的等速变形试验的测试方法。将记录的测试数据拟合到流变模型中，并根据模型得出材料参数的值。对膨胀弹跳腻子在不同变形速度下的弹性和黏度参数进行了量化。指标x术语-弹跳腻子，非牛顿流体，粘弹性，剪切增厚，膨胀，流变模型，材料测试，弹簧阻尼器行为介绍离子
In t his contribution the mechanical properties of Bouncing Putty are investigated and the material parameters are determined by a rheological model. The Bouncing Putty is a silicone polymer, which shows viscoelastic behavior and it is characterized as a Non-Newtonian fluid with dilatancy. If it is thrown on a surface, it bounces back like a spring. But it flows like a viscous fluid, if it is simply put on a desk. The reason why it behaves either like an elastic material or like a viscous liquid is the velocity of the deformation. For dilatant also named shear-thickening materials the viscosity increases, if the strain rate (velocity of the deformation) rises. Because of the non-linear stiffness and damping behavior, this material is very interesting as a smart material in modern engineering, especially to handle disturbing vibrations and dynamic effects. Hence, to use this material for applications in engineering the non-linear spring-damping behavior has to be assessed by the functional relations of the mechanical parameters. But, determining elasticity and viscosity is not trivial, because the non-constant values are based on experiments and they depend on the theoretical model, which is applied. Due to this, an appropriate rheological model to map the effect of shearthickening is developed and a testing method, based on a deformation test under a constant velocity of deformation using a servo-hydraulic testing machine, is presented. The recorded testing data is fitted to the rheological model and this yields the values of the material parameters according to the model. As a result, the elasticity and the viscosity parameters of the dilatant Bouncing Putty are quantified for different deformation velocities. Inde x Terms - Bouncing Putty, Non-Newtonian fluid, viscoelastic, shear-thickening, dilatant, rheological model, material testing, spring-damper behavior 1. INTRODUCT ION