基于夏比试验确定船用钢板断裂韧性

摘要

To obtain the relationship between impact toughness and fracture toughness, a curve relationship of the absorbed energy in the impact test, test temperature and ductile to brittle transition temperature was estab- lished. The expressions of fracture toughness of ship steel plates related to steel plate thicknesses and service temperatures were obtained. According to the P-S-N curve, the reliability was introduced, and the method to determine the corresponding fracture toughness of ship plate was realized under different steel plate thickness and service temperature in the arbitrary reliabilities condition, which can be a reference to make safe assess- ment of the cracked plate in shin structure.%为了寻求材料的冲击韧性和断裂韧性之间的对应关系，根据已有的夏比V型缺口冲击试验数据，建立了冲击试验吸收能与试验温度和韧脆转变温度之间的曲线关系，提出了不同强度不同质量等级船用钢板厚度、使用温度和断裂韧性三者之间函数关系，并结合P—S．N曲线的思想，引入了可靠度的概念，实现了确定任意可靠度下不同板厚和使用温度所对应的钢板断裂韧性的方法，为含裂纹损伤结构的安全状态评估提供依据．