Issue 48

R. Nikhil et alii, Frattura ed Integrità Strutturale, 48 (2019) 523-529; DOI: 10.3221/IGF-ESIS.48.50 527 M =1.6 and h =4 mm, the yield contour crosses the interface boundary and spreads to base material to a larger area compared to specimen with M =2.2 and h =16 mm. R ESULTS AND DISCUSSION ypical P L vs. A plot for M =1.6 , h/ W=0.08 and M =2.2 , h/ W=0.32 is shown in Figs. 7(a)and 7(b). These values are fitted to a second order polynomial. As per the eqn. 6, η values are calculated for all configurations of C(T)specimens. For the homogeneous C(T)specimens, the calculated η values are in close agreement of ±4% with ASTM proposed η values as given eq. (1). Similar observation has been reported by Zhou and co-authors [10]. The estimated η values for various configurations of weld C(T)specimen are given in Table 1. Table 1 : η values calculated for heterogeneous specimens using FYC approach. T η for M=1.2 η for M=1.8 h /W 0.08 0.16 0.24 0.32 h/ W 0.08 0.16 0.24 0.32 b/W b/ W 0.3 2.096 1.910 1.809 2.338 0.3 2.081 1.795 1.597 1.767 0.35 2.185 2.106 1.975 2.202 0.35 2.130 1.892 1.746 1.787 0.4 2.231 2.185 2.121 2.116 0.4 2.153 1.906 1.795 1.767 0.45 2.262 2.239 2.173 2.040 0.45 2.170 2.001 1.952 1.758 0.5 2.302 2.303 2.238 2.008 0.5 2.202 2.036 1.947 1.778 0.55 2.259 2.273 2.225 1.993 0.55 2.169 2.019 1.985 1.815 η mean 2.223 2.169 2.090 2.116 η mean 2.151 1.941 1.837 1.778 η for M=1.4 η for M=2 h /W 0.08 0.16 0.24 0.32 h/ W 0.08 0.16 0.24 0.32 b/W b/ W 0.3 2.088 1.869 1.735 2.121 0.3 1.866 1.970 1.767 1.550 0.35 2.156 2.045 1.829 2.029 0.35 2.041 1.942 1.823 1.649 0.4 2.190 2.108 1.911 1.991 0.4 2.101 1.929 1.801 1.695 0.45 2.214 2.154 2.003 1.938 0.45 2.146 1.875 1.824 1.756 0.5 2.251 2.215 2.046 1.928 0.5 2.199 1.856 1.849 1.799 0.55 2.213 2.197 2.038 1.916 0.55 2.189 1.880 1.851 1.819 η mean 2.185 2.098 1.927 1.987 η mean 2.090 1.908 1.819 1.711 η for M=1.6 η for M=2.2 h/ W 0.08 0.16 0.24 0.32 h/ W 0.08 0.16 0.24 0.32 b/W b/ W 0.3 2.082 1.834 1.815 1.838 0.3 1.868 1.751 1.640 1.536 0.35 2.140 2.003 1.886 1.798 0.35 2.034 1.832 1.713 1.633 0.4 2.168 2.056 1.864 1.854 0.4 2.088 1.898 1.752 1.674 0.45 2.188 2.098 1.904 1.903 0.45 2.128 1.980 1.794 1.705 0.5 2.222 2.157 1.918 1.881 0.5 2.181 1.956 1.845 1.761 0.55 2.188 2.148 1.924 1.897 0.55 2.172 2.002 1.846 1.777 η mean 2.164 2.049 1.885 1.862 η mean 2.079 1.903 1.765 1.681