Curvilinear variable stiffness 3D printing technology for improved open-hole tensile strength
Curvilinear variable stiffness 3D printing technology for improved open-hole tensile strength
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DOI：
10.1016/j.addma.2018.10.013
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发表时间：
2018-12-01
影响因子：
11
通讯作者：
Nik, Mandi Arian
中科院分区：
文献类型：
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作者：
Khan, Sadben;Fayazbakhsh, Kazem;Nik, Mandi Arian
熔丝制造 (FFF) 是最流行的 3D 打印工艺之一，它提供了制造灵活性，并为最终零件引入了各向异性特性。利用曲线可变刚度（CVS）3D打印技术，可以进一步提高和优化制造产品的机械性能。在这项工作中，我们展示了 CVS 设计如何根据 ASTM D5766 提高制造样本的开孔拉伸强度和失效应变。此外，样品宽度与孔径之比被视为设计参数并进行研究。结果发现，对于较大孔径配置（从 48.0 MPa 到 66.2 MPa），CVS 设计将失效强度提高了 38.0%，而失效应变（从 0.0125 mm/mm 到 0.0130 mm/mm）的改善仅限于 4.0%。另一方面，对于较小孔径的情况，使用CVS设计使失效应变显着改善了52.5%（从0.0141 mm/mm到0.0215 mm/mm），而失效应力改善了16.7%（76.0 MPa到88.6 MPa），但不太明显。
Fused Filament Fabrication (FFF), one of the most popular processes of 3D printing, offers flexibility in manufacturing and introduces anisotropic properties to the final parts. With the use of Curvilinear Variable Stiffness (CVS) 3D printing technology, mechanical properties of the manufactured products can be further improved and optimized. In this work, we demonstrate how CVS design can improve open-hole tensile strength and failure strain of the manufactured specimens per ASTM D5766. In addition, the ratio of the specimen width to the hole diameter is considered as a design parameter and investigated. It is found that CVS design improves the failure strength by 38.0% for a larger hole diameter configuration (from 48.0 MPa to 66.2 MPa), while the improvement in failure strain (from 0.0125 mm/mm to 0.0130 mm/mm) is limited to only 4.0%. On the other hand, for a smaller hole diameter case, a substantial improvement of 52.5% in failure strain is obtained with the use of CVS design (from 0.0141 mm/mm to 0.0215 mm/mm), while 16.7% improvement in failure stress (76.0 MPa to 88.6 MPa) is less pronounced.