This study intended for the assessment of the stiffness, tensile and bursting properties of 3D printed auxetic sinusoidal patterns of different density and thickness deposited on the nylon fabric by means of fused deposition modeling (FDM) with the use of thermoplastic polyurethane (TPU) filament. Morphology, weight variation, flex stiffness, tensile property, Poisson’s ratio and bursting strength were analyzed for the characteristic evaluation of produced composite. The prototypes of two auxetic pattern repeat of 47 mm×43 mm and 20 mm×20 mm were developed named as low density (LD) and high density (HD) respectively. Both patterns were repeatedly combined to produce bigger size patterns and 3D printed with various thicknesses. Weight variation is found proportional to the density and thickness of 3D printed auxetic sinusoidal. Maximum up to 552 % weight increase was recorded for LD pattern and for HD 857 %. Flex stiffness increased with the rise of density and thickness of 3d printed auxetic sinusoidal pattern. Maximum flex stiffness for HD was 7.21 cm-g and for LD 4.73 cm-g. Warp direction is stiffest comparing with diagonal and weft in all cases. In case of tensile strength, a great extent of elongation was noticed due to the presence of auxetic sinusoidal 3D pattern and TPU filament. Maximum, more than 500 % elongation was showed by HD diagonal direction. HD patters exhibited more strength and toughness than LD patterns. In addition, warp direction is strongest and diagonal direction is weakest whereas the weft stays in between. Both LD-1.0 and HD-1.0 3D printed pattern showed negative Poisson’s ratio and the value was between -1.0 to 0. The enhanced bursting strength is found in HD patterns up to 1514 kPa comparing up to 1449 for LD. Thus, this study confirmed the excellent stiffness, tensile and bursting properties of HD 3D printed auxetic sinusoidal pattern/nylon composite over LD.

这项研究旨在评估通过使用热塑性聚氨酯（TPU）长丝通过熔融沉积建模（FDM）沉积在尼龙织物上的3D打印的密度和厚度不同的膨胀正弦图案的刚度，拉伸和破裂特性。分析了形态，重量变化，挠曲刚度，拉伸性能，泊松比和破裂强度，以评价所生产的复合材料的特性。分别将47mm×43mm和20mm×20mm的两个膨胀图案重复的原型开发为低密度（LD）和高密度（HD）。将这两种图案重复组合以产生更大尺寸的图案，并以各种厚度打印3D。发现重量变化与3D打印的膨胀正弦波的密度和厚度成正比。LD模式和HD 857％记录的最大最大重量增加552％。挠曲刚度随着3d打印的膨胀型正弦曲线图案的密度和厚度的增加而增加。HD的最大挠曲刚度为7.21 cm-g，LD的最大挠曲刚度为4.73 cm-g。与所有情况下的对角线和纬线相比，经线方向最坚硬。在抗张强度的情况下，由于存在膨胀型正弦3D图案和TPU细丝，因此注意到很大程度的伸长。通过HD对角线方向最大显示出超过500％的伸长率。HD图案比LD图案显示出更多的强度和韧性。另外，经线方向最强而对角线方向最弱，而纬线则介于两者之间。LD-1.0和HD-1.0 3D打印图案均显示负泊松比，其值在-1.0到0之间。在高达1514 kPa的HD模式中发现增强的破裂强度，而LD则高达1449。因此，这项研究证实了HD 3D打印的膨胀型正弦图案/尼龙复合材料在LD上具有出色的刚度，拉伸和破裂性能。