CFRP层合板制孔周期内轴向力分布规律研究

When drilling of carbon fiber-reinforced polymers (CFRPs), it is considered that the associated damages are closely related to thrust force. Modeling the variation and distribution of thrust force during drilling cycles has, hence, been extremely important to reveal the generation and propagation of damages. The definition of specific cutting power is introduced first to describe the materials remove rate per unit time. Then, the cutting edges of a drill are divided into infinite cutting elements. The local cutting force on the elements of chisel edge and major cutting edge are modeled empirically using the specific cutting power. After calculating the cutting edge angles of each cutting element, the relation between the specific cutting power and thrust force is built by applying transforming matrixes to local and global coordinate system. Lastly, the specific cutting power is calibrated using the information which is extracted from the thrust force measured when drilling of unidirectional CFRP. By using the thrust force model, 1) the unidirectional CFRP drilling thrust force distribution, 2) the association of drilling damages and thrust force distribution and 3) the superposition of the thrust force generated in drilling of multi-directional CFRP were investigated.