## 3 The Experimental Dataset  
The experimental data used in this study are obtained from several literature sources [30; 31; 32; 34; 41; 42]. The data include a total of 113 data points that represent 113 unique experimental configurations (no duplicates are included). The experiments were conducted on relatively large scale panels of different configurations that contain a lead crack and adjacent MSD cracks. The output of each experiment is the residual strength which is obtained by performing tensile test and finding the load that caused the failure of the ligament between the lead crack and the adjacent MSD cracks on both sides. The residual strength values being used here represent the nominal remote stress which is calculated as the failure load divided by the panel's nominal cross-sectional area (that includes the stiffeners' cross-sectional area in case of the stiffened panels). Using the stress rather than the load values is actually more appropriate here since panels of different widths, thicknesses and stiffener configurations are included in the experimental data. The experimental data being used in this study are all for the same aluminum alloy (2024-T3), but they cover a wide variety of test panel configurations, material conditions, grain orientation, widths, thicknesses, and lead and MSD cracks geometries. The 113 experimental data points that are used here include: (i) four different test panel configurations (unstiffened, stiffened with a broken stiffener, and lap-joint), (ii) bare and clad material conditions, (iii) longitudinal and transverse grain orientations, (iv) different sheet thickness (from 1 mm to 1.8 mm), (v) different panel widths (from 508 mm to 2286 mm), vi) different lead crack lengths (from 76 mm to 546 mm), (vii) different MSD crack lengths (from 7.6 mm to 25.4 mm), and (viii) different ligament lengths between the lead and adjacent MSD cracks (from 3.8 mm to 38 mm). The experimental data are included in the Appendix A in three tables where they are grouped according to the test panel configuration. The unstiffened panels' data include 50 data points, and they are presented in Table 1. The stiffened panels' data include 36 data points that cover two different stiffeners configurations (crack centered between stiffeners and crack centered under a broken middle stiffener), and they are presented in Table 2. Finally, the lap-joint panels' data include 27 data points, and they are presented in Table 3. Each of these three tables contain the material's yield strength, the test panel and cracks geometry, and the experimentally obtained residual strength values. For the stiffened panels (Table 2), the stiffener's cross-sectional area (A\({}_{\text{stf}}\)) is also given. To save space, the material thickness, condition and grain orientation data are not included in the tables since they are not used as inputs for the ANN model (they are accounted for indirectly through the material's yield strength). For the interested reader, such information as well as more details about the experimental data and the configurations of the test panels can be found in [PERSON] et al. [27]. It should be mentioned here that the yield strength values reported in the table are the standard handbook values (not the actual values obtained from testing specimens cut out of the same sheets) and that these values depend on the material's thickness, condition and grain orientation. The yield strength values given in all tables are the A-basis values obtained from MIL-HDBK-5H [54]. In addition to the yield strength, the different geometric quantities and the experimentally obtained residual strength; the tables also give some of the SIF geometric correction factors and the linkup model's residual strength prediction for each of the 113 configurations. These additional parameters given in the tables are meant to be used as assistance input parameters in the assisted-ANN approach being proposed in this paper.