Failure analysis of 3D printed glass fiber/PA12 composite lattice structures using DIC
Failure analysis of 3D printed glass fiber/PA12 composite lattice structures using DIC
复制标题
使用 DIC 3D 打印玻璃纤维/PA12 复合材料晶格结构的失效分析
DOI：
10.1016/j.compstruct.2019.111192
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发表时间：
2019-10-01
影响因子：
6.3
通讯作者：
Fang, Daining
中科院分区：
文献类型：
--
作者：
Hao, Wenfeng;Liu, Ye;Fang, Daining
本文采用数字图像相关技术（DIC）研究了3D打印纤维增强聚酰胺12（PA12）复合材料网格结构的力学性能和失效模式。首先，采用选择性激光烧结（SLS）技术制备了纤维增强尼龙12复合材料拉伸试样和点阵结构。然后对拉伸试样进行了拉伸实验，得到了拉伸强度和弹性模量。此外，对3D打印的PA12复合晶格结构进行了压缩实验。利用离散元方法得到了结构的全场位移和应变，并从应变场中捕捉到了结构的破坏位置和破坏模式。对比分析了3D打印的PA12复合材料网格结构在有纤维增强和无纤维增强两种情况下的重复吸能性能。实验结果表明，纤维增强3D打印PA12复合材料的拉伸强度和弹性模量均高于未增强的材料。3D打印PA12复合材料网格结构中加入纤维增强材料后，其压缩强度低于未加入纤维增强材料的压缩强度，但其重复吸能性能比未加入纤维增强材料的稳定。
In this paper, the mechanical properties and failure modes of 3D printed fiber-reinforced polyamide 12 (PA12) composite lattice structures were studied using digital image correlation (DIC). First, the fiber-reinforced PA12 composite tensile samples and lattice structures were prepared by selective laser sintering (SLS). Then the tensile experiments were carried out on the tensile samples, and the tensile strength and elastic modulus were obtained. Moreover, the compressive experiments were carried out on the 3D printed PA12 composite lattice structures. The full field displacements and strains were obtained using DIC, and the failure position and failure mode can be captured from the strain fields. The repetitive energy absorption property of the lattice structures was comparative analyzed between the 3D printed PA12 composite lattice structures with and without fiber-reinforcements. The experimental results show that the tensile strength and elastic modulus of the 3D printed PA12 composites with fiber-reinforcements are higher than that without fiber-reinforcements. The compressive strength of the 3D printed PA12 composite lattice structures with fiber-reinforcements are lower than that without fiber-reinforcements, but the repetitive energy absorption property of the 3D printed PA12 composites lattice structures with fiber-reinforcements are more stable than that without fiber-reinforcements.