Development of a regression model for the life assessment of open-hole specimens with double through cracks utilizing stress intensity factor calculations via XFEM

Integral Aircraft Wing Panels with Penetration Cracks: The Influence of Structural Parameters on the Stress Intensity Factor

“…Based on the Taylor expansion method and the data of finite element results, taking the panel spacing of 80 mm, panel height of 70 mm, panel thickness of 4 mm and crack size of 5 mm as the starting point, the corresponding SIF as the starting value of the function, and considering the quadratic term of the expansion formula, the stress intensity of the integral panel was calculated by a multivariate nonlinear regression model taking the rib spacing, height, thickness and crack size as the function variables. The derivation model is as follows [15]:…”

“…By controlling a single variable to calculate the SIF, the influence of three structural parameters of the whole panel on the crack tip SIF was analyzed. According to the results of the finite element analysis, the regression model of stress intensity factor prediction based on the structural parameters of the integral panel and the crack size is obtained [15]. The validity of the model is determined by comparing the predicted value of the regression model with the calculated value of the FEM.…”