3D打印仿贝壳珍珠层复合材料的压缩力学性能

Research on Compressive Mechanical Properties of 3D Printing Nacre Composite

为了研究3D打印仿贝壳珍珠层复合材料在准静态压缩情况下的力学性能,探索3D打印贝壳珍珠层复合材料细部尺寸变化对力学性能的影响规律,采用光固化3D打印成型的制备方法,应用刚性不透明塑料Vero Blue作为硬质砖块,软质橡胶Tango Black作为软质胶层,制备了不同砖块长宽比和不同软胶层厚度的仿贝壳珍珠层复合材料试样。运用准静态压缩的力学测试方法,同时结合有限元分析软件ABAQUS的验证,考察了仿贝壳珍珠层复合材料的压缩力学性能。实验和数值分析结果清晰表明,3D打印仿贝壳珍珠层复合材料的主要破坏形式是软质胶层开裂。数据结果显示:当软质胶层厚度不变,增加硬质砖块的长宽比可以提升整体材料的弹性模量22%~48%;而硬质砖块长宽比保持不变时,软质胶层厚度的减少则能提升断裂能量190%~253%.另外分析了试样在压缩应变为0.05时的压缩应力,结果显示有限元分析与实验结果比较吻合。

To investigate the mechanical properties of 3D printing nacre composite under quasi-static compressive engineering status, the regular patterns of mechanical property developpment of 3D printing nacre composite under the influence of detail size changes were explored. Photocuring 3D printing moulding fabrication method was adopted and rigid non-transparent plastic Vero Blue was applied to hard bricks and soft rubber Tango Black was used to soft glue layers for the purpose of the fabricfation of nacre composite specimens with different aspect ratios of hard bricks and different soft glue layer thicknesses. Meanwhile, quasi-static compressive mechanical testing technique was accepted and the verification by finite element analysis software ABAQUS was combined simultaneously to investigate the compressive mechanical properties of nacre composite. Both of the experiment and the numerical analysis have shown clearly that the dominant damage pattern of 3D printing nacre composite is cracking of soft glue layers. And data results have shown that when thickness of soft glue layers is constant, the improvement in aspect ratio of hard bricks can improve compressive elastic modulus of entire material by the amplitude of 22%-48%. And from another angel, when aspect ratio of hard bricks is fixed, the decrease of soft glue layer thickness can increase crack energy of specimens by the amplitude of 190%-253%. Moreover, through the analysis of compressive stresses of specimens under a certain moment, results have shown that finite element analysis and experiment results coincide agreeably.