Abstract: The performance of continuous carbon fiber composite 3D printed parts has a demand for fiber laying direction,and the traditional path planning method is filled based on the shape profile of the part,which can not meet the actual performance of the part. To solve this problem,a path planning method for continuous carbon fiber composite 3D printing based on principal stress trajectory lines was proposed. Based on the finite element analysis data of the continuous carbon fiber composite 3D model,the corresponding principal stress trajectory lines were calculated by material mechanics. Through the printing parameters of continuous carbon fiber composite material 3D printing,the obtained principal stress trajectories were regulated to ensure that the spacing between each trajectory lines met the requirements of 3D printing. The finite element analysis coordinate system and printer coordinate system were adjusted by coordinate transformation. The G code planning file for continuous carbon fiber composite 3D printing was generated through the above regulation. Through path planning simulation comparison and print tensile test,the performance of the continuous carbon fiber print path generated based on the principal stress trajectory line was improved by 4.5 % compared with the traditional straight path,which verifies the effectiveness of the path planning method for continuous carbon fiber composite 3D printing based on the principal stress trajectory line.

Key words: principal stress trajectory lines, path planning, continuous carbon fiber composite 3D printing