Breaking prediction method

G - Physics – 01 – N

Patent

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G01N 3/00 (2006.01)

Patent

CA 2641174

The possibility of breaking of a material is quantitatively evaluated by the comparison of the relationship between data obtained by a numerical analysis using a finite-element technique and a breaking limit stress line, using a breaking limit stress line, which has been provided by converting the hole expansion ratio to stress, as a criterion for breaking. According to the above construction, in determining a breaking limit of an elongation flange part in a thin plate in a course including one or more deformation process change, the breaking limit line can be determined easily and efficiently to predict breaking with high accuracy and thus to evaluate the possibility of breaking upon pressing or collision.

Selon la présente invention, la probabilité de rupture d'un matériau est évaluée de manière quantitative par comparaison de la relation existant entre les données obtenues par une analyse numérique employant une technique à éléments finis et une ligne de contrainte de limite de rupture, employant une ligne de contrainte de limite de rupture, qui a été obtenue par conversion du rapport de dilatation de trous en contrainte, et sert de critère de rupture. Selon la construction susmentionnée, le fait de déterminer une limite de rupture d'un partie bride allongée dans une plaque fine, pendant une période comprenant une ou plusieurs modifications du procédé de déformation, permet de déterminer facilement et efficacement la ligne de limite de rupture afin de prévoir une rupture avec une grande précision et d'évaluer ainsi la probabilité de rupture lors d'une compression ou d'une collision.

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