带孔 4D 打印聚乳酸物体的尺寸精度:实验和数值研究

Q2 Engineering Designs Pub Date : 2024-06-06 DOI:10.3390/designs8030056
Alexandru-Antonio Ene, Tudor George Alexandru, Diana Popescu
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引用次数: 0

摘要

本研究调查了材料和工艺参数(特别是长丝颜色、填充密度和图案)对 4D 打印聚乳酸(PLA)物体尺寸精度的影响,这些物体具有不同直径(6、8 和 10 毫米)的孔,并经过了热诱导恢复过程。目的是通过对恢复前后的孔径进行比较分析,了解这些因素如何影响孔的形状保持和尺寸精度。无论自变量的值如何,孔径在恢复后的变化都有所增加。物体没有完全恢复到原来的平面形状,孔也没有完全恢复到圆形,因此每个样品的直径都较小。无法确定孔径的明显差异。此外,在确定对回收孔精度影响最大的参数方面也没有一致的趋势。不过,据观察,填充密度越高,形状保持越好。开发了一个准静态有限元分析模型来捕捉 4D 打印部件的机械行为。该模型结合了随温度变化的材料特性,以预测孔附近发生的应变。根据变形形状定义了节点位移。观察到的应变与试样恢复后的尺寸精度之间建立了相关性。这项工作的重要性通过一个涉及小型物体双筛过滤装置的案例研究得到了证明。
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Dimensional Accuracy in 4D-Printed PLA Objects with Holes: Experimental and Numerical Investigations
This study investigates the impact of material and process parameters—specifically, filament color, infill density, and pattern—on the dimensional accuracy of 4D-printed polylactic acid (PLA) objects featuring holes of varying diameters (6, 8, and 10 mm) that undergo a heat-induced recovery process. The objective was to understand how these factors affect shape retention and the dimensional accuracy of holes through a comparative analysis of the diameters before and after recovery. Increased variability in the hole diameters was noted after recovery, regardless of the values of the independent variables. The objects did not fully return to their original planar shape, and the holes did not completely return to their circular form, resulting in smaller diameters for each sample. No significant differences in the hole diameters could be determined. Additionally, there was no consistent trend in identifying the most influential parameter affecting the accuracy of the recovered holes. However, it was observed that higher infill densities improved shape retention. A quasi-static finite elements analysis model was developed to capture the mechanical behavior of the 4D-printed parts. This model incorporated temperature-dependent material characteristics to predict the strain occurring near the holes. Nodal displacements were defined according to the deformed shape. A correlation was established between the observed strains and the post-recovery dimensional accuracy of the specimens. The importance of this work was demonstrated through a case study involving a two-sieve filtering device for small objects.
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来源期刊
Designs
Designs Engineering-Engineering (miscellaneous)
CiteScore
3.90
自引率
0.00%
发文量
0
审稿时长
11 weeks
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