On a high-potential variable-stiffness device
On a high-potential variable-stiffness device
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在高电位变刚度装置上
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
G. Gerlach
中科院分区：
文献类型：
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作者：
M. Henke;G. Gerlach
几乎每个工程领域都在为轻量化结构开发有效的复合结构。这涉及到例如航空，但也涉及到汽车工业和能源收集应用。现代概念的轻量化组件尝试使用具有可调节属性的结构。然而，经典的复合材料只能稍微适应变化的环境条件，因为大多数材料，如碳或玻璃纤维复合材料，表现出时间常数和不可改变的特性。这篇文章描述了新型智能、自我控制结构的发展、潜力和局限性，这种结构可以改变它们的机械性能——特别是它们的弯曲刚度——超过一个数量级。这些结构采用多层方法，由10层0.75毫米厚的聚碳酸酯层堆叠而成。利用ABAQUS进行有限元分析，对结构进行了解析描述，并对其力学性能进行了预测。各个层由一组形状记忆合金线编织在一起，这些线既可以一起激活，也可以单独激活。根据流过导线的电流所施加的温度和相应的收缩，导线可以控制整个堆栈的面积惯性矩，并随之控制弯曲刚度。首先进行的实验研究表明，最大刚度变化是原来的60倍，接近于理论预测值。
There are great efforts in developing effective composite structures for lightweight constructions for nearly every field of engineering. This concerns for example aeronautics, but also automotive industry and energy harvesting applications. Modern concepts of lightweight components try to use structures with adjustable properties. However, classic composite materials can only slightly adapt to varying environmental conditions because most materials, like carbon- or glass-fiber composites, show properties which are time-constant and not changeable. This contribution describes the development, the potential and the limitations of novel smart, self-controlling structures which can change their mechanical properties—in particular their flexural stiffness—by more than one order of magnitude. These structures use a multi-layer approach consisting of a ten-layer stack of 0.75 mm thick polycarbonate layers. The set-up is analytically described and its mechanical behavior is predicted by finite element analysis performed with ABAQUS. The individual layers are braided together by an array of shape memory alloy wires, which can be activated either all together or independently. Depending on the temperature applied by an electrical current flowing through the wires and the corresponding contraction, the wires can control the area moment of inertia of the whole stack, and with it the bending stiffness. First experimental investigations have shown a maximum stiffness change by a factor of 60, which is close to the theoretically predicted value.