The effects of toolpath and glass fiber reinforcement on bond strength and dimensional accuracy in material extrusion of a hot melt adhesive
The effects of toolpath and glass fiber reinforcement on bond strength and dimensional accuracy in material extrusion of a hot melt adhesive
复制标题
热熔胶材料挤出过程中刀具路径和玻璃纤维增强对粘合强度和尺寸精度的影响
DOI：
10.1016/j.addma.2022.103056
复制
发表时间：
2022
影响因子：
11
通讯作者：
Peterson, Amy M.
中科院分区：
文献类型：
--
作者：
Pourali, Masoumeh;Peterson, Amy M.
在这项工作中，聚酰胺热熔胶（technommelt PA 6910）及其玻璃纤维填充复合材料（Loctite 3D 6910）作为桌面级热驱动材料挤出增材制造（AM）的原料进行了评估。technommelt PA 6910是一种半结晶聚合物，具有亚环境玻璃化转变温度，中等熔融温度和低再结晶温度。本文旨在研究玻璃纤维和刀具轨迹对打印件力学性能、翘曲和尺寸精度的影响。玻璃纤维提高了0°栅格角试样的屈服强度，降低了90°栅格角试样的屈服强度。由于薄件的快速冷却，从单路宽盒中切割的样品比多层（≈3.2 mm厚）样品的焊接强度降低更为明显。玻璃纤维防止了盒子的翘曲和初始层的过度铺开。刀具路径影响Technomelt PA 6910的拉伸性能，其中较长的刀具路径导致更高的翘曲和由于较长的层数而降低的零件抗拉强度，但不影响乐泰3D 6910的拉伸性能。虽然Technomelt PA 6910具有各向同性的拉伸性能，但玻璃纤维的加入使乐泰3D 6910棒材具有各向异性的拉伸性能，并且在单路（≈0.4 mm厚）部件中更为显著。多层乐泰3D 6910结构更坚固，这使得这种材料更适合大规模应用，其中存在高热质量和坍落是一个重大的打印挑战。
In this work, a polyamide hot melt adhesive (Technomelt PA 6910) and its glass fiber-filled composite (Loctite 3D 6910) were evaluated as feedstocks for desktop-scale thermally-driven material extrusion additive manufacturing (AM). Technomelt PA 6910 is a semicrystalline polymer with a sub-ambient glass transition temperature, intermediate melting temperature, and low recrystallization temperature. This paper aims to study the effect of glass fibers and toolpath on mechanical properties, warpage, and dimensional accuracy of prints. Glass fibers improved the yield strength of 0° raster angle bars, but reduced the strength of 90° raster angle samples. The reduced weld strength was more significant in samples cut from single road width boxes than multilayer (≈3.2 mm thick) specimens due to fast cooling of thin parts. Glass fibers prevented warpage and excessive spread of initial layers of boxes. Toolpath affected tensile properties for Technomelt PA 6910, in which longer toolpaths resulted in higher warpage and decreased tensile strength of parts due to longer layer times, but did not affect tensile properties for Loctite 3D 6910. While Technomelt PA 6910 exhibits isotropic tensile properties, the addition of glass fibers resulted in anisotropic properties of Loctite 3D 6910 bars, which was more significant in single road (≈0.4 mm thick) parts. Multilayer Loctite 3D 6910 structures are stronger, which makes this material more appropriate for larger scale applications in which there is a high thermal mass and slumping is a significant printing challenge.