METHOD OF EVALUATING FORMABILITY OF STEEL PLATE USING OVERLAPPED MULTIPLE GRIDS

摘要

PURPOSE: A method for evaluating the formability of a steel plate using a plurality of overlapped grids is provided to accurately obtain a formability limit even though cracks are occurred in a portion of a material. CONSTITUTION: A method for evaluating the formability of a steel plate using a plurality of overlapped grids comprises: a step(S700) for marking a plurality of grids overlapped with adjacent grids throughout the entire region of the surface of the steel plate; a step(S701) for pressing the steel plate where a plurality of girds is marked by using a punch of a predetermined diameter; and a step(S702) for evaluating the formability of the steel plate after measuring the strain of the grids around fracture generated by measuring. [Reference numerals] (AA) Start; (BB) End; (S700) Mark a plurality of grids which is partially overlapped with adjacent grids over the entire region of the surface of a steel plate; (S701) Press the steel plate where the plurality of girds is marked by using a punch with a predetermined diameter; (S702) Evaluate the formability of the steel plate by measuring the strain of the grids around fracture generated after pressing