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Analytically driven experimental characterisation of damping in viscoelastic materials

机译：粘弹性材料中阻尼的解析驱动实验表征

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The damping assessment of highly dissipative materials is a challenging task that has been addressed by several researchers; in particular Oberst defined a standard method to address the issue. Experimental tests are often hindered by the poor mechanical properties of most viscoelastic materials; these characteristics make experimental activities using pure viscoelastic specimens prone to nonlinear phenomena. In this paper, a mixed predictive/experimental methodology is developed to determine the frequency behaviour of the complex modulus of such materials. The loss factor of hybrid sandwich specimens, composed of two aluminium layers separated by the damping material, is determined by experimental modal identification. Finite element models and a reversed application of the modal strain energy technique are then used to recover the searched storage modulus and loss factor curves of rubber. In particular, the experimental setup was studied by comparing the solutions adopted with the guidelines given in ASTM-E756-05. An exhaustive validation of the values obtained is then reported. (C) 2014 Elsevier Masson SAS. All rights reserved.
机译：高耗散材料的阻尼评估是一项艰巨的任务，已有几位研究人员提出了解决方案。特别是Oberst定义了解决此问题的标准方法。大多数粘弹性材料的较差的机械性能通常会阻碍实验测试。这些特性使使用纯粘弹性标本的实验活动容易出现非线性现象。在本文中，开发了一种混合的预测/实验方法来确定这种材料的复模量的频率行为。通过实验模态识别确定由两层铝层和阻尼材料隔开的混合夹心样品的损耗因子。然后使用有限元模型和模态应变能技术的逆向应用来恢复搜索到的橡胶的储能模量和损耗因子曲线。特别是，通过将采用的解决方案与ASTM-E756-05中给出的指南进行比较，研究了实验装置。然后报告获得的值的详尽验证。 （C）2014 Elsevier Masson SAS。版权所有。

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