【作者】 李昌； 钟继如； 关凯书；

【Author】 LI Chang;ZHONG Jiru;GUAN Kaishu;School of Mechanical and Power Engineering,East China University of Science and Technology;

【机构】 华东理工大学机械与动力工程学院；

【摘要】 断裂韧性是核反应堆、承压设备安全评估、寿命预测以及含缺陷承压设备风险评估中最重要的参考指标。传统的力学试验试样需要大量的材料,不能在服役的承压设备上进行,而小冲杆试验（SPT）试样比传统的小得多,可以从承压设备表面微损取样,取样后不需进行修补,从试验的载荷—位移曲线可以确定材料的许多力学性能参数。本文提出了利用反向有限元法从小冲杆试验中获取了WELDOX 900钢的真应力应变曲线、GTN参数和断裂韧度值的方法。反向有限元法的结果与常规试验结果对比发现J_0.2的数值误差约10%。更多还原

【Abstract】 Fracture toughness is the most important reference index in the safety assessment,life prediction and risk assessment of nuclear reactors and pressure equipment.Conventional mechanical test specimens require large quantities of material and cannot be performed on pressurized equipment in service.The small punch test（SPT） specimens are much smaller than the traditional ones,and can be sampled from the surface of the pressure equipment without repair,and many mechanical properties of the material can be determined from the load-displacement curve of the test.In this paper,a method is proposed to obtain the true stress-strain curve,GTN parameters and fracture toughness values of WELDOX 900 steel from the small punch bar test by using the reverse finite element method.Compared with the results of the conventional test,the numerical error of J_0.2 is about 10%.更多还原