Machining Deformation Analysis of Aircraft Monolithic Components based on the Energy Method

Abstract

In the process of machining aircraft monolithic components, the initial stress in the blank will cause machining deformation. Based on the energy method, an analytical mathematical model of machining deformation is presented in this paper. The key point is to transform the energy in the removed material into the deformation energy of the part after machining. The initial residual stress of 7050-T7451 aluminum alloy blank and single frame part are used as investigated case in the analytical model. For layer by layer machining, the deformation evolution is closely related to the tensile or compressive properties of the initial stress of removed material. Combined with the change of neutral axis position, The machining deformation is calculated by theoretical model. Then, FEM simulation is carried out to analyze the influence of stiffening ribs on machining deformation utilizing the semi-analytical model of equivalent bending stiffness. Furthermore, experiments are set up to verify the validity of the theory and FEM data. The results indicate that the deformation results of the experiment are consistent with that of theory and FEM model. Deformation is determined by energy of removed material. This paper provides a novel theoretical approaches for the further investigation of this issue.

MMDP-Net: an aircraft deformation prediction network based on feature fusion

“…The assembly deformation prediction model developed by Wang et al [4] is based on the static mechanics equation of an elastic beam and serves as a basis for the analysis of aircraft deformation deviation. A mathematical model for analyzing assembly deformation was developed by Huang et al [5] who also investigated the impact of initial stress on deformation in aircraft assembly. This research introduces a novel theoretical approach for analyzing aircraft deformation.…”

MMPD-Net: An Aircraft Deformation Prediction Network Based on Multimodal Fusion

“…Wang et al [19] based on the static mechanics equation of elastic beam, derived the assembly deformation prediction model, it lays a foundation for the prediction of aircraft deformation deviation analysis. Huang et al [20] studied the influence of initial stress on deformation in aircraft assembly, and established a mathematical model for analyzing assembly deformation, which provides a new theoretical method for aircraft deformation analysis. Liu et al [21] proposed new cross-scale method to predict the structural deformation of aircraft materials, and the method has been applied to multiple stages of multiple assembly and achieved good results.…”