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首页> 外文期刊>The Journal of the Textile Institute >Improving the stiffness of multilayer 3D woven composites by the integration of shape memory alloys (SMAs) into structures
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Improving the stiffness of multilayer 3D woven composites by the integration of shape memory alloys (SMAs) into structures

机译：通过将形状记忆合金（SMA）集成到结构中，改善多层3D编织复合材料的刚度

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摘要

Shape memory alloys (SMAs) are capable of shape-retaining and stress generation when activated. SMA wires are embedded in laminated composites for improving the properties of the composites. Laminated composites have low through-the-thickness properties and poor delamination resistance. 3D composites are well known for having higher through-the-thickness properties. In 3D woven composites, a set of yarn is in through-the-thickness direction that improves through-the- thickness properties and provides resistance to delamination of layers. As in multilayer 3D woven structures, yarns are distributed from in-plane to through-the-thickness direction, so in-plane properties are reduced with the same number of yarns compared to 2D laminated composites. In this research, SMA wires are embedded into different types of 3D woven structures for utilising stress generation property of SMA wires for improving in-plane properties, specifically stiffness of the composites. Three types of 3D orthogonal interlocking composites: layer-to-layer, through-the-thickness, and modified multilayer interlock structures are fabricated with and without SMA wires. From the tensile test, results show that embedding SMA wires into structures significantly improves the stiffness of the structures due to the stress-induced martensite phase of SMA wire when subjected to load. When these SMA wires are activated, stresses are generated by SMA wires due to phase transformation from martensite to austenite that further gives remarkable higher values of stiffness. This results in a composite structure that has higher in-plane properties due to embedded SMA wire and through-the-thickness properties due to 3D structure of composite reinforcement. The interlocking pattern in the through-the-thickness direction of 3D structures was also found to have an effect on the extent of the improvement in stiffness.
机译：形状记忆合金（SMA）能够在激活时形成形状和应力。 SMA线嵌入层叠复合材料中，以改善复合材料的性质。层压复合材料具有较低的厚度性能和差的分层电阻。众所周知，3D复合材料具有较高的厚度性能。在3D编织复合材料中，一组纱线是贯穿厚度方向，可提高厚度的性能，并提供对层的分层的抗性。与多层3D编织结构一样，纱线从平面内分配到厚度方向，因此与2D层叠复合材料相比，通过相同数量的纱线在平面内性能降低。在该研究中，SMA线嵌入到不同类型的3D编织结构中，用于利用SMA线的应力产生性能，以改善平面内的性质，特别是复合材料的刚度。三种类型的3D正交互锁复合材料：层面，贯穿厚度和改进的多层互锁结构是用且没有SMA线制造的。从拉伸试验中，结果表明，由于在经受负荷时，将SMA电线嵌入结构中显着提高了结构的刚度，这是由于SMA线的应力诱导的马氏体相。当这些SMA线被激活时，由于Martensite对奥氏体的相变导致的SMA线产生应力，这进一步提供了更高的刚度值。这导致复合结构，其由于复合材料加固的3D结构而导致的嵌入式SMA线和厚度特性具有较高的面内特性。还发现了3D结构的贯穿厚度方向上的互锁图案对刚度的改善程度有影响。

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