低匹配对接接头的抗冲击等承载设计方法

In order to solve the problems of insufficient impact load-carrying capacity of undermatching butt joints of A921 high-strength steel, based on the idea of ELC, the impact energy was taken as the parameter of the load-carrying capacity of impact load, and the relationship of ELC was established. Through Charpy impact tests of A921 steel specimen, it is found that there is a linear relationship between impact toughness and bending resistance, and the quantitative relationship between the impact toughness and component geometry size is obtained. The impact test results of Q345 steel specimen show that the relationship is still valid, which indicates that the relationship may be generalized to a certain extent. The impact toughness of two materials may be compared and the mechanics response of specimens with different sizes may be predicted by this relationship. Finally, the design scheme of ELC impact resistance was proposed: the optimal joint thickness was calculated to make the base metal and the welded joint fracture consume the same impact energy, then making the thickness as the design conditions of ELC joints under the impact loads, thus the design was carried out in combination with the geometric parameter optimization method of ELC joints.