Buckling performance of high-precision variable stiffness composites laminate based on automatic placement technology

Abstract

The buckling resistance of the variable stiffness composite laminates laid by the automatic placement can be effectively improved by tailoring the in-plane stiffness. During the placement process, laying the trajectory path planning is one of the key technologies to achieve variable stiffness design. So, the fiber trajectories composed of angle linear variation, constant-curvature curve and quadratic Bezier curve were taken as the research object, and the parametric analysis of its compression buckling performance was carried out. Finally, the influence of tape width on the surface profile accuracy and buckling resistance mechanical properties was studied using a finite element model. The results show that under the compression condition, the secondary Bezier curve has the best buckling resistance, and the equal curvature curve is least affected by the curvature constraint. The width of the tape is negatively correlated with the area of the overlap area and the buckling resistance, when the tow width of the fiber placement head is constant. Using the largest tape size can minimize the overlapping area and improve the profile accuracy of the composite structure. At the same time, it is guaranteed that the buckling performance of the structure is improved by 37.3%.