Being arrest performance evaluation manner

摘要

PROBLEM TO BE SOLVED: To provide an easier and simpler evaluation method of steel products than any conventional ESSO testing, which can inhibit variation by taking distribution of fracture toughness in board thickness direction of the steel product into consideration.;SOLUTION: This method is characterized in that the crack arrest condition in T₀ is defined as K₀= Kd + K₀×r to evaluate arresting performance of the intended steel product based on the K₀ value, where this K₀ value is the crack extension drive force in design stress (σ₀) and preset temperature (T₀) determined from design requirement for using the intended steel product, Kd is the resistance to crack extension near central area on board thickness of the intended steel product, and K₀×r is the resistance to crack extension due to ductile fracture occurred on surface layer of the intended steel product.;COPYRIGHT: (C)2009,JPO&INPIT