PREDICTING METHOD OF BENDING RADIUS AT BUCKLING LIMIT IN BENDING ALUMINUM ALLOY SHAPE, PREDICTING METHOD OF WIDTHT TO THICKNESS RATIO, AT BUCKLING LIMIT, BENDING METHOD OF ALUMINUM ALLOY SHAPE AND RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To predict a bending radius at a buckling limit of a shape made of aluminum alloy in a high precision. ;SOLUTION: For a bending radius at a buckling limit in bending a shape made of aluminum alloy, a bending center radius R satisfying the formulas 1, 2 in the following is obtained. (t is a thickness of object section to predict a buckling limit among a shape, b is a plate width, h is a distance from a bending neutral axis to a bending most inside part of the object section as taking a bending direction in a positive direction, k is a buckling coefficient, (A, B, C) are coefficients different in the case that a shape is T1 heat treated material or T5 heat treated material, η is a constant showing a stress state (-h'/h), h' is a distance from a neutral axis to a bending most outside part of the object section as taking a bending direction in a positive direction, (D, E, F) are coefficients different when the object section is a protruded flange or except the protruded flange).;COPYRIGHT: (C)2001,JPO