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首页> 外文会议>Conference on Active and passive smart structures and integrated systems; 20090309-12; San Diego, CA(US) >Shape-variable sandwich structure with SMA honeycomb core and CFRP skins
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Shape-variable sandwich structure with SMA honeycomb core and CFRP skins

机译：具有SMA蜂窝芯和CFRP外壳的形状可变的三明治结构

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摘要

The authors proposed a sandwich structure that consists of a shape memory alloy (SMA) honeycomb core and carbon fiber reinforced plastic (CFRP) skins as a lightweight geometric-variable structure. This method has the better ability to bend skins with high in-plane stiffness, because the SMA honeycomb core generates a recovery-shear-force and applies the force uniformly to the skins. Hence, although this sandwich beam is really lightweight and has a moderate specific bending stiffness, the beam can be bent by raising the temperature. The honeycomb core was made of thin Ti-Ni SMA foils, and skins were thin unidirectional CFRP laminates. Pre-shear-strain was applied to the SMA honeycomb core, and the both ends of the two skins were fixed. When the beam was heated, it was bent upward taking the form of a sigmoid curve. Furthermore, it was verified that the beam was able to generate the sufficient actuation force. Then, when the specimen was cooled down to the room temperature, the specimen returned to the straight beam again. Hence the two-way actuation is possible by heating and cooling. Also the mechanism of this bending deformation could be clarified by a numerical simulation using the finite element method.
机译：作者提出了一种三明治结构，该结构由形状记忆合金（SMA）蜂窝状芯和碳纤维增强塑料（CFRP）蒙皮组成，是一种轻巧的几何可变结构。由于SMA蜂窝芯会产生恢复剪切力并将力均匀地施加到皮肤上，因此该方法具有更好的使皮肤具有较高的面内刚度的能力。因此，尽管该夹层梁确实很轻并且具有适度的特定弯曲刚度，但是可以通过升高温度来弯曲该梁。蜂窝状芯由薄的Ti-Ni SMA箔制成，表皮为薄的单向CFRP层压板。将预剪切应变应用到SMA蜂窝芯，并固定两个蒙皮的两端。当光束被加热时，它以S形曲线的形式向上弯曲。此外，已证实梁能够产生足够的致动力。然后，当样品冷却至室温时，样品再次返回直光束。因此，通过加热和冷却可以双向驱动。同样，可以通过使用有限元方法的数值模拟来阐明这种弯曲变形的机理。

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