Thermomechanical behavior of shape memory alloy metal matrix composite actuator manufactured by composite extrusion
Thermomechanical behavior of shape memory alloy metal matrix composite actuator manufactured by composite extrusion
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DOI：
10.1088/1361-665x/ab0ef5
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发表时间：
2019-05-01
影响因子：
4.1
通讯作者：
Tekkaya, A. E.
中科院分区：
文献类型：
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作者：
Dahnke, C.;Reeb, A.;Tekkaya, A. E.
连续复合材料挤压代表了形状记忆合金金属基复合材料（SMA-MMC）制造的新可能性。在此过程中，SMA丝通过改进的分流模嵌入铝或镁型材中。由于SMA元件的轮廓几何形状、材料以及数量、厚度和位置的高度灵活性，该过程可以用于生成轮廓集成弯曲功能。致动器轮廓的弯曲功能取决于温度并且被热激活。实验研究了影响复合致动器性能的参数。结果表明，曲率半径主要取决于SMA丝的回复应力和偏心位置以及驱动器剖面的弯曲刚度。弯曲机制和实验结果描述的分析模型，以及有限元分析的使用。基于结果，分析模型用于具有多个嵌入式NiTi丝的型材的目标设计，该型材能够在室温和75摄氏度之间的限定温度范围内执行可重复的纯弹性偏转。
Continuous composite extrusion represents a new possibility for the manufacturing of shape memory alloy metal matrix composites (SMA-MMC). During the process SMA wires are embedded into aluminum or magnesium profiles by means of modified porthole dies. Due to the high flexibility regarding the profile geometry, the materials as well as number, thickness and position of the SMA elements, the process can be used for the generation of a profile integrated bending function. The bending function of the actuator profile depends on the temperature and is thermally activated. The parameters influencing the behavior of the manufactured composited actuators are experimentally investigated. It is found that the radius of curvature mainly depends on the recovery stress and the eccentric position of the SMA wire as well as on the bending stiffness of the actuator profile. The bending mechanism and the experimental results are described by the use of an analytical model as well as a finite element analysis. Based on the results the analytical model is used for the targeted design of a profile with multiple embedded NiTi wires, which is able to perform a repeatable, pure elastic deflection within a defined temperature range between room temperature and 75 degrees C.