中文摘要：

基于电流体动力学（EHD）微尺度3D打印（电流体动力喷射打印或电喷印）的成形机理复杂，成形影响因素较多，首先对泰勒锥的受力状况进行了理论分析，然后用有限元数值模拟和实验方法进行验证，探索了该微尺度3D打印方法的喷射机理，并揭示了电压、压力对锥射流喷射性能的影响规律。结果表明，电压越大，锥形越短；入口压力越大，锥形越长，同时也表明了在一定的电压和气压范围内喷印均可以正常进行，而不是特定的电压或气压，从而可以通过调节电压和气压改善锥射流及喷印质量。用光固化树脂材料进行的喷印实例中获得了较好的喷印质量。

英文摘要：

Micro scale 3D printing based on electrohydrodynamic （electrohydrodynamic jet printing, Ejet printing） is an emerging and promising micro/nano scale 3D printing processes, which was demonstrated with outstanding strengthens and high potentials in terms of high resolution, low cost and easy operation. Micro scale 3D printing was utilized in various areas, including tissue engineering, electronics, micro fuel cell, composite materials, etc. Different from the traditional jet printing technology, the EHD jet is driven by electric field to draw a very fine jet from the top of the liquid cone. The forming mechanism of micro scale 3D printing based on EHD was complex, and there were several influencing factors and process parameters. The stress state of Taylor cone was analyzed theoretically, and then the finite element simulation and experimental methods were used to verify the theory. Through the investigation, the jetting mechanism of the micro scale 3D printing method was explored, and the influences of voltage and pressure of cone-jet mode on E-jet printing were revealed, and some useful conclusions were achieved. The result showed that the Taylor cone was shortened with the increase of voltage, and it was lengthened with the increase of inlet. Meanwhile, it was shown that the printing can be carried out in a certain range of voltage and pressure, rather than specific values of voltage or pressure, so the cone jet and printing quality can be improved by adjusting the voltage and air pressure. A printing example of light curing resin material was given, and the printing quality was good. The research results provided theoretical basis and guidance for improving the forming accuracy and control performance of micro scale 3D printing based on EHD.