Finite Element Analysis And Hole Machining Quality Research On The Drilling Process Of Titanium Alloy /CFRP Stack

Titanium alloy/carbon fiber reinforced composite material(CFRP)stack is widely used in aerospace field,however,the titanium alloy and CFRP are difficult-to-cutting materials and the coupling effect of the two,and makes it more difficult to drilling on Titanium alloy/ CFRP stack.In this paper,the drilling process of titanium alloy /CFRP laminated composite was studied,and the finite element modeling analysis were carried out.The main contents are as follows:Firstly,based on the processing characteristics of drilling process on titanium alloy,the constitutive model of titanium alloy is established by using the classical Johnson-Cook model.Based on the equivalent medium theory and CFRP material properties,CFRP equivalent medium constitutive model is established,and the friction model,heat conduction model are established.The finite element modeling of the drilling process on the titanium alloy /CFRP stack is finished.Secondly,based on the finite element model of the DEFORM 3D software,the influence of different parameters on cutting force and cutting temperature is simulated and analyzed.The validity of the finite element model is verified by means of the laminated structure.The error sources of the test results and simulation results are analyzed.Finally,the influence of different parameters on the surface roughness,pore size,and the quality of the hole wall is studied by using the full factor test method.In this paper,the finite element simulation model and the change law of the hole quality are studied.The influence of cutting force and cutting heat on the drilling process of the laminated structure is provided to provide technical support and theoretical reference.