12.3 Finite Element Analysis Eroded defects and a drilled hole defect were simulated using a commercial finite element code (Abaqus). Six different erosion geometries were simulated to investigate the effect of varying damage geometry on the performance of the repair. A schematic view of an example erosion geometry is illustrated in Fig. 12.5 when the erosion diameter (e) around the hole is five times the hole diameter (d). The composite material was modeled as a linear-elastic, orthotropic material with material parameters taken from experimental data [8]. For all simulations, the repairs consisted of a 6.25 mm thick and 292.1 mm long composite layer that was assumed to be perfectly bonded to the substrate. An internal pressure of 6.89 MPa was applied for all simulations and a mesh convergence study was performed. Figure 12.6a shows an example ¼ model that was modeled. Figure 12.6b shows the interface along which the opening strains ε22 were obtained. This interface is the location where the crack is expected to initiate and grow. Fig. 12.4 Schematic valid data point Fig. 12.5 Modeled erosion area Fig. 12.6 Finite element analysis 110 O. Ramirez and M.W. Keller
RkJQdWJsaXNoZXIy MTMzNzEzMQ==