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The influence of viscoelastic film thickness on the dynamic characteristics of thin sandwich structures

机译:粘弹性膜厚度对薄夹层结构动力特性的影响

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Passive damping techniques by means of viscoelastic materials are widely used for structural vibrations control. Sandwich structures composed of viscoelastic adhesive films and metallic constraining layers result in thin composite structures with improved dynamic capabilities. The nature and the small thickness of these sandwich structures enable them to be processed in conventional metal sheet transformation techniques to obtain components of complex geometries. In this work the influence of the viscoelastic film thickness on the dynamic properties, stiffness and damping, of thin sandwich structures is analysed from experimental and numerical results. Sandwich structures composed of same viscoelastic material but three different core thicknesses are tested and the dynamic properties of the viscoelastic film are obtained. From the experimental results a material model with fractional derivatives is proposed for the shear complex modulus of the viscoelastic adhesive film. The results show the viscoelastic film thickness has a greater influence in the loss factor than in the storage modulus, being this effect more pronounced at high frequencies. The bending stiffness of the sandwich structure is increased with core thickness even if the storage modulus is decreased. Therefore, the viscoelastic film thickness determines the vibrational response of thin sandwich structures. (C) 2015 Elsevier Ltd. All rights reserved.
机译:借助于粘弹性材料的被动阻尼技术被广泛用于结构振动的控制。由粘弹性胶粘剂薄膜和金属约束层组成的三明治结构可形成具有改善的动态性能的薄复合结构。这些夹层结构的性质和较小的厚度使它们能够以常规的金属板转换技术进行处理,以获得复杂几何形状的组件。在这项工作中,从实验和数值结果分析了粘弹性膜厚度对薄夹层结构的动力特性,刚度和阻尼的影响。测试了由相同粘弹性材料但具有三种不同芯厚度的三明治结构,并获得了粘弹性膜的动态特性。从实验结果出发,提出了具有分数导数的材料模型,用于粘弹性粘合膜的剪切复数模量。结果表明,粘弹性膜的厚度对损耗因子的影响大于对储能模量的影响,在高频下这种影响更为明显。即使降低储能模量,夹心结构的抗弯刚度也会随着芯的厚度而增加。因此,粘弹性膜的厚度决定了薄夹层结构的振动响应。 (C)2015 Elsevier Ltd.保留所有权利。

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