| Q420qE桥梁钢深缺口断裂强度特性试验研究 |
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| 引用本文： | 宫旭辉,高珍鹏,吴松林,牛佳佳.Q420qE桥梁钢深缺口断裂强度特性试验研究[J].材料开发与应用,2022,37(3):1-4. |
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| 作者姓名： | 宫旭辉 高珍鹏 吴松林 牛佳佳 |
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| 作者单位： | 1. 中国船舶集团有限公司第七二五研究所, 河南 洛阳 471023; |
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| 摘 要： | 开展了20 mm厚Q420qE钢-80℃～+20℃下的深缺口宽板拉伸试验和标准光滑试样拉伸试验,试验结果表明:随温度的降低,光滑试样的断裂强度Rf逐步增大,断裂应变ef基本不变,而深缺口试样的断裂强度Rn则出现明显的下降。为表征Rn与Rf、ef及温度的相关性,提出了引入温度项的修正Neuber公式,修正后的公式计算得到的Rn值与实测值的偏差在±5%以内,这一结果表明,对于深缺口宽板拉伸试验,温度的降低可能会增大缺口引起的应力应变集中效应。
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| 关 键 词： | Q420qE钢 深缺口 断裂强度 |
| 收稿时间： | 2022-01-14 |
Experimental Study on Deep Notch Fracture Characteristics of Q420qE Bridge Steel |
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| Affiliation: | 1. Luoyang Ship Material Research Institute, Luoyang 471023, China;2. Henan Key Laboratory of Technology and Application of Structural Materials for Ships and Marine Equipment, Luoyang 471023, China |
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| Abstract: | Deep notch wide plate tensile test and conventional tensile test are conducted on 20 mm-thick Q420qE steel in temperature range of -80~20℃. Results indicate that with the decreasing temperature, the fracture strength Rf increases, the fracture strain ef remains almost the same, and the deep notch fracture strength Rn decreases. A modified Neuber formula is proposed to describe the relationship between Rn, Rf, ef and the temperature. The deviation between Rn calculated by the proposed formula and tested by deep notch wide plate tensile test is within ±5%, indicating that for deep notch wide plate tensile test, the decrease of temperature may increase the concentration of stress and strain due to the presence of the deep notch. |
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