13th International Conference on Fracture June 16–21, 2013, Beijing, China 2 Table 1 fracture toughness-associated parameters measured in COD tests of a normalized C-Mn steel T=100oC σ y=470MPa σmax=1880MPa Qmax=4.0 DMS/δc=1.25 N=0.21 Test No. PGy (N) Pf (N) δc (μm) Xf (μm) Xf 1/2 (mm1/2) Xf/δc σf (MPa) εpc σm/σe F KIC (MPa m-1/2) d (μm) Mark Y02 8036 9016 114 102 0.32 0.89 1852 0.0458 2.41 241.9 131.0 4.0 L Y40 8330 8673 74 158 0.4 2.14 1795 0.0058 2.81 276.3 105.5 3.0 R Y41 7840 8820 121 131 0.36 1.08 1861 0.0369 2.62 276.0 134.9 3.0 L Y05 7644 8036 72 60 0.24 0.83 1852 0.0678 2.10 181.4 104.1 11.3 L Y26 7448 8232 100 120 0.35 1.2 1861 0.0311 2.73 268.3 122.7 4.5 L Y31 7644 7840 53 75 0.27 1.41 1847 0.0140 3.10 202.5 89.3 3.8 R Y36 8036 8330 64 139 0.37 2.17 1791 0.0052 2.85 254.0 98.1 4.4 R Y25 7644 8526 111 90 0.3 0.81 1852 0.0673 2.12 226.8 129.2 3.2 L Y35 7350 8330 128 175 0.42 1.37 1852 0.0180 3.05 317.5 138.8 7.5 R Y11 8428 9212 117 119 0.34 1.02 1800 0.0241 2.57 232.6 132.7 7.5 L Y47 8036 8232 55 86 0.29 1.56 1842 0.0184 3.06 215.8 91.0 5.4 R Y13 － 7350 20 63 0.25 3.15 1617 0.0050 2.65 127.9 54.9 8.6 R Y21 － 7840 22 62 0.25 2.82 1678 0.0052 2.72 142.2 57.5 3.8 R Y44 7448 7644 52 112 0.33 2.15 1790 0.0075 2.96 226.2 88.4 7.5 R Y43 7840 7840 26 78 0.28 3 1645 0.0063 2.64 153.6 62.5 6.6 R Y15 － 6468 10 69 0.26 6.9 1391 0.0036 2.27 58.1 38.8 5.4 R Y22 6860 7448 131 169 0.41 1.29 1861 0.0219 2.90 314.3 140.4 6.1 L Y42 7840 8134 81 75 0.27 0.93 1861 0.0458 2.84 188.4 110.4 4.8 L Y19 7546 7840 80 131 0.36 1.64 1842 0.0133 3.03 267.9 109.7 8.3 R Y12 8036 8232 73 113 0.34 1.55 1833 0.0184 3.08 249.5 104.8 6.5 R Y27 7350 7350 42 16 0.13 0.38 1810 0.1829 1.62 92.0 82.3 3.0 L Y23 6953 7252 56 66 0.26 1.18 1861 0.0233 2.71 199.3 91.8 3.8 L Y14 7546 7546 33 69 0.26 2.09 1860 0.098 2.94 199.0 70.5 6.3 R Y16 7840 8036 72 169 0.41 2.35 1758 0.0040 2.81 266.8 104.1 3.0 R Y30 7644 8330 82 96 0.31 1.17 1861 0.0240 2.70 237.6 111.1 8.1 L Y04 － 8036 29 138 0.37 4.75 1490 0.0035 2.44 149.5 66.1 3.5 R Y37 8428 8624 77 124 0.35 1.61 1833 0.0183 3.08 256.8 107.6 6.5 R Y38 8722 8918 47 10 0.32 2.13 1795 0.0080 2.90 221.1 84.1 2.7 R Y33 8330 8526 36 93 0.3 2.58 1840 0.0057 2.66 222.6 73.6 3.8 R Y10 8036 8036 30 67 0.26 1.68 1763 0.0052 2.93 170.5 67.2 3.2 R Y17 － 7546 14 60 0.24 4.29 1513 00042 2.51 101.3 45.9 2.9 R Y03 － 7350 12 30 0.17 2.5 1767 0.0046 2.83 112.2 42.5 3.8 R Y1 － 5330 10 20 0.14 2 1734 0.0059 2.80 87.5 38.8 * R Y2 － 6270 12 17 0.13 1.42 1838 0.0186 2.80 96.1 42.5 * R Y3 － 7500 17 85 0.29 5 1466 0.0035 2.45 111.8 50.6 * R Y4 － 7690 22 50 0.22 2.27 1706 0.0051 2.92 134.4 57.5 * R Y5 8560 8670 35 43 0.21 1.23 1875 0.0254 2.69 164.5 72.6 * L Y6 8570 8670 36 44 0.21 1.22 1875 0.0245 2.72 164.5 73.6 * L N01 6370 7640 132 25 0.16 0.19 1800 0.4257 2.57 111.4 140.9 6.0 L N23 8430 8430 34 20 0.14 0.59 1828 0.1166 1.71 101.9 71.5 3.7 L N06 5684 6080 54 51 0.23 0.94 1852 0.0443 2.84 173.9 90.2 4.3 L N21 8530 8530 30 0 0 0 1743 0.9727 0.60 0.0 67.2 2.3 L No: specimen number ; T: test temperature; Py: yield load; Pf: fracture load; σy: yield stress; δc: critical value of COD; Xf: distance from cleavage initiation site to blunted precrack tip ; σf: local fracture stress; εpc: critical plastic strain; e m σ σ / : critical stress triaxiality; F=Xf 1/2{σf (1+N)/2N/ σ y (1-N)/2N}, KIC: critical stress intention factor, d: diameter of particle triggering cleavage; Mark: denoting the distance of cleavage initiation site relative to that of peak stress; L: distance shorter than that of peak stress position DMS, Xf ＜DMS; R: distance longer than that of peak stress position DMS, Xf ＞DMS;
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