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15MnVN鋼为我国九江长江大桥鋼梁将采用的基材。九江长江大桥是一座铁路公路两用大跨度桥梁,将承受高速列车的动力加载。本试验利用J_R阻力曲线法在三种不同加载速度(△为8.33×10~(-3),4.2～9.6×10~(-1)和1.5×10~2mm/S)和常温到-140℃温度范围的条件下进行15MnVN鋼56毫米厚板基材的断裂韧性试验。对于相同材料,同时进行了在三种应变速率(ε为3.33×10~(-4),1.80×10~(-2)和6.89 1/s下不同温度时的J_ε,σ_b,δ_5及(?)值的测试。本试验对于断裂力学应用于桥梁建设,尤其是铁路桥梁建设,提供了重要的参考数据。
15MnVN steel for the Jiujiang Yangtze River Bridge steel beam will be used as a substrate. Jiujiang Yangtze River Bridge is a large-span railroad dual-span bridge that will withstand the high-speed train power loading. The experiment uses J_R resistance curve method at three different loading rates (△ is 8.33 × 10 -3, 4.2 ~ 9.6 × 10 -1 and 1.5 × 10 ~ 2mm / S) and normal temperature to -140 ℃ Fracture toughness test of 56mm thick slab substrate of 15MnVN steel was performed under the temperature range. For the same material, J_ε, σ_b, δ_5 and (?) At different temperatures of three kinds of strain rates (ε of 3.33 × 10 -4, 1.80 × 10 -2 and 6.89 1 / s) ) Value of the test.This test for the fracture mechanics used in bridge construction, especially railway bridge construction, provides an important reference data.