Effect of ultrasonic vibration on the friction stir weld quality of aluminium alloy

A novel variant of friction stir welding process, referred as ultrasonic vibration enhanced friction stir welding, is developed to transmit ultrasonic vibration energy directly into the localized area of the workpiece near and ahead of the rotating tool. Experiments are conducted on 6061-T4 aluminium alloy plates by this new process and the conventional friction stir welding process, respectively. The morphology and macrograph of the welds under both conditions are observed and contrasted. The experimental results show that ultrasonic vibration enhanced friction stir welding can improve the weld formation quality and increase the welding efficiency. And it just needs a smaller axial downward force. Because that the added action of ultrasonic vibration energy may enhance the localized softening extent and the plastic flow around the tool. In addition, it also improves the mechanical properties of the welded joints.     

基于RealityCapture的智能仿真虚拟实验室研究及开发

5G时代的到来,其携带的大带宽、低时延和海量互联网连接的特点使得三维虚拟空间交互学习变得更加稳定与高效。为解决现存在的虚拟VR环境难以快速搭建、模型仿真相似度不足和三维虚拟交互平台难以高效集成等问题,该文提出一种利用RealityCapture高效初始生成和Blender修补完善虚拟三维模型,最后,由pano2VR集成并部署于校园服务器的智能仿真虚拟实验室搭建方案。经该文研究搭建成功的智能仿真虚拟实验室运行稳定,模型仿真相似度极高且交互功能较强,达到预期效果,满足用户需求。