Issue 41

Z. Li et alii, Frattura ed Integrità Strutturale, 41 (2017) 378-387; DOI: 10.3221/IGF-ESIS.41.49 382 Test Procedure Following the blind hole drilling method, the test procedure goes as: prepare the surface, paste strain rosettes, weld the wires, install the tool, drill the holes, record the drilling, remove the tool and sort out the tool. Fig. 4 presents the most important steps in the procedure. T EST RESULTS AND ANALYSIS Test results igs. 5-12 show the distribution of the longitudinal stresses in the specimens. (a) (b) Figure 5: Longitudinal residual stress distribution of CH-1. (a) Flage; (b) Web. (a) (b) Figure 6: Longitudinal residual stress distribution of CH-2. (a) Flage; (b) Web. (a) (b) Figure 7: Longitudinal residual stress distribution of CH-3. (a) Flage; (b) Web. F