Abstract
Carbon nanotube yarns are embedded in three-dimensional (3D) braided composites with five-axis yarns, which are used as strain sensors to monitor the damage of 3D braided composites. In the cyclic mechanical loading experiment, the strain-sensing characteristics of 3D braided composites were studied by in situ measuring the resistance change of the embedded carbon nanotube yarn. The 3D five-directional braided composite prefabricated part based on carbon nanotube yarns was developed, and the progressive damage accumulation experiments were carried out on carbon nanotube yarns and specimens embedded in carbon nanotube yarns. The research results show that there is a good correlation between the change of relative resistance of the carbon nanotube yarn and the strain of the composite specimen during cyclic loading and unloading. When the tensile degree of the specimen increases beyond a certain range, the carbon nanotube yarn sensor embedded in the specimen shows resistance hysteresis and produces residual resistance. Therefore, the fiber can better monitor the progressive damage accumulation of 3D five-direction braided composites.
Highlights
As an advanced structural load-bearing material, three-dimensional (3D) braided composite materials, due to their excellent properties such as nonlayered structure, good overall performance, one-time braiding, and flexible design of special-shaped parts, have a growing share in engineering applications that pay great attention to strength and light characteristics, especially in the field of aerospace [1]
By observing the change of the resistance of the embedded carbon nanotube yarns with the tensile loading of the composites, the occurrence and progressive damage accumulation of the composites are monitored, which provides the basis for the application of 3D braided composite in situ sensors based on carbon nanotube yarns
Strain-Sensing Characteristics of the Carbon Nanotube Yarn under Monotonic Tension. e monotonic tensile test of the carbon nanotube yarn was carried out to analyze the relationship between stress and strain, strain, and resistance change rate of the carbon nanotube yarn
Summary
As an advanced structural load-bearing material, three-dimensional (3D) braided composite materials, due to their excellent properties such as nonlayered structure, good overall performance, one-time braiding, and flexible design of special-shaped parts, have a growing share in engineering applications that pay great attention to strength and light characteristics, especially in the field of aerospace [1]. Previous studies have shown that [15,16,17] the embedded CNT fiber sensor can be used to monitor the generation and expansion of damage in composite structures in real time. Rough cyclic loading and unloading experiments, the strain-sensing performance of the carbon nanotube yarn sensor for composite materials was analyzed. By observing the change of the resistance of the embedded carbon nanotube yarns with the tensile loading of the composites, the occurrence and progressive damage accumulation of the composites are monitored, which provides the basis for the application of 3D braided composite in situ sensors based on carbon nanotube yarns
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