PREDICTION METHOD AND PREDICTION SYSTEM OF FRACTURE STRAIN OF WELDING PART, AND METHOD FOR MANUFACTURING MEMBER INCLUDING WELDING PART

摘要

PROBLEM TO BE SOLVED: To provide a method for predicting fracture strain of a welding part, capable of accurately predicting the fracture strain of a member composed of a steel type whose fracture strain is not still derived without performing a local fracture strain deriving process.SOLUTION: A fracture strain prediction method includes: a master curve determination step for collecting fracture strains of a plurality of steel types whose fracture strains are previously calculated in each material parameter specified by chemical components of each steel type and determining an approximate master curve of fracture strains from distribution of fracture strains; a material parameter calculation step for calculating a material parameter of a steel type to be evaluated by chemical components of the steel type to be evaluated; and a fracture strain calculation step for calculating fracture strain of the steel type to be evaluated by using the approximate master curve determined by the master curve determination step and the material parameter of the steel type to be evaluated which is calculated by the material parameter calculation step.