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为了研究桥梁高性能钢的断裂韧性,对中国舞阳钢厂生产的高性能钢HPS 485W进行了一系列的断裂韧性试验研究。通过夏比V形缺口冲击试验得到HPS 485W在不同温度下的冲击韧性,并应用Boltzmann函数求解韧脆转变温度曲线,试验结果表明:与传统桥梁用钢相比,HPS 485W冲击韧性更高且韧-脆转变温度更低。由HPS 485W延性断裂韧度(JIC)试验,测得板厚18mm和28mm的HPS 485W试样的J积分值,试验结果表明HPS485W具有优良的断裂韧性。对8mm和14mm的HPS 485W进行裂纹尖端张开位移(CTOD)试验,试验结果表明HPS 485W有良好的塑性和韧性。基于HPS 485W拉伸试验获得的应力-应变曲线结果,运用失效评定曲线方法对CTOD试验值进行评定,HPS 485W的母材断裂韧性(CTOD)落在评定曲线的合格范围内。该文的研究为高性能钢桥的安全评定和防断裂设计提供了试验依据。
In order to study the fracture toughness of high performance steel bridge, a series of fracture toughness tests were carried out on the high performance steel HPS 485W produced by Wuyang Steel Plant in China. The impact toughness of HPS 485W at different temperatures was obtained by Charpy V-notch impact test. The Boltzmann function was used to solve the ductile-brittle transition temperature curve. The experimental results show that the HPS 485W has higher impact toughness and toughness than the traditional bridge steel - Brittle transition temperature is lower. From the JPS test of HPS 485W ductility fracture toughness (JIC), the J integral values of HPS 485W specimens with thickness 18mm and 28mm were measured. The results show that HPS485W has excellent fracture toughness. Crack Tip Displacement (CTOD) tests were performed on 8 and 14 mm HPS 485W. The results show that the HPS 485W has good ductility and toughness. Based on the results of stress-strain curve obtained from HPS 485W tensile test, the CTOD test value was evaluated by failure assessment curve method. The fracture toughness (CTOD) of HPS 485W fell within the acceptable range of the assessment curve. The research of this paper provides a test basis for the safety assessment and fracture prevention design of high-performance steel bridges.