Simulation analysis of aramid fiber reinforced polymer hole machining and experimental study on delamination mechanism

The AFRP (aramid fiber reinforced polymer) material's finite element model is built using ABAQUS software for resin and aramid fiber based on the Johnson-Cook failure and Hashin failure criterion. The effects of feed rate and hole diameter on axial force and fiber layer displacement are determined by the simulation study of milling holes. It was possible to decide on the delamination force and produce the fiber layer displacement curve by measuring the delamination force of aramid fiber composites with various layer thicknesses and hole diameters. Elastic deformation, linear loading delamination, severe failure delamination, and stability failure delamination were classified into four phases. The geometric model for Tool-AFRP hole machining is created. The functional connection between delamination force and fiber layer displacement is obtained from the model's axial force production process. The Kistler9129AA dynamometer is used to conduct the hole machining experiment. Analysis of the variation law of the hole machining axial force under the aforementioned influencing elements, as well as the impacts of feed speed, hole diameter, and processing method, further demonstrates the accuracy of the geometric model, the variation law of the delamination force and fiber layer displacement in the test agrees with the derivation above.