TABLE 13.3 Corrected Notched Strength Data(Table 13.1) and Values of A Determined Using the Newton-Raphson Method R (mm) GNIGo 1.6 0.73 0.5998 2.5 0.64 0.6867 3.3 0.62 0.7052 Corrected using Equation(13.14). 0.8 Carbon/Epoxy [0/±45/901s 0.6 0.4 -m 0.2 -lg C 0 0.20.40.6 0.81.0 Log R FIGURE 13.9 Determination of the parameters m and C for [0/+45/90],carbon/epoxy specimens,m =0.36, and C=1.16 mm-i. 1.0 m=0.36 C=1.16mm 0.8 ON 0.6 00 0.4 IK 0.2 Carbon/Epoxy [0/生45/90]s -0.5 00.51.0 1.52.0 Log R (mm) FIGURE 13.10 Theoretical and experimental notch sensitivity for [0/+45/901,carbon/epoxy specimens. As an illustration of the goodness of the fit for the parameters m and C, the theoretical curve of oN/oo is plotted vs.log R along with the experimental values in Figure 13.10.Within the limited range of experimental data,excellent agreement is observed.Once the parameters m and C are established,it is possible to predict the notched strength for any hole size and coupon width (within reasonable limits)using the above methodology. 2003 by CRC Press LLCAs an illustration of the goodness of the fit for the parameters m and C, the theoretical curve of σN/σ0 is plotted vs. log R along with the experimental values in Figure 13.10. Within the limited range of experimental data, excellent agreement is observed. Once the parameters m and C are established, it is possible to predict the notched strength for any hole size and coupon width (within reasonable limits) using the above methodology. TABLE 13.3 Corrected Notched Strength Data (Table 13.1) and Values of λ Determined Using the Newton-Raphson Method R (mm) σN /σ0 a λ 1.6 2.5 3.3 0.73 0.64 0.62 0.5998 0.6867 0.7052 a Corrected using Equation (13.14). FIGURE 13.9 Determination of the parameters m and C for [0/±45/90]s carbon/epoxy specimens, m = 0.36, and C = 1.16 mm–1. FIGURE 13.10 Theoretical and experimental notch sensitivity for [0/±45/90]s carbon/epoxy specimens. TX001_ch13_Frame Page 178 Saturday, September 21, 2002 5:07 AM © 2003 by CRC Press LLC