Method of forecasting the lifetime of structural parts

Details Method of forecasting the lifetime of structural parts Method of forecasting the lifetime of structural parts

G - Physics

01

N

G01N 3/32 (2006.01)

Patent

CA 2669984

A method is provided for determining the extent of cyclic stress fatigue suffered by a component comprising the steps of: (i) obtaining a gauge material which undergoes a continued progressive/cumulative and quantifiable change in at least one of its physical properties in response to repeated strain cycles applied to the gauge material, the quantifiable change being indicative of both degree of strain and number of cycles incurred during the repeated strain cycles; (ii) determining a correlation between an extent of the quantifiable change in the gauge material and an effect on said component of a corresponding number and degree of strain cycles; (iii) affixing the gauge material to said component to subject the gauge material to any strain encountered by an adjacent portion of the component; (iv) at least periodically determining the extent of said quantifiable change to the gauge material to determine the extent of cyclic stress fatigue undergone by the component.

L'invention concerne un procédé permettant de déterminer l'étendue d'une fatigue de tension cyclique subie par un composant, qui comprend les étapes consistant à : (i) obtenir un matériau calibré qui subit un changement progressif/cumulé et quantifiable en continu dans au moins l'une de ses propriétés physiques en réponse à des cycles de déformation répétés appliqués au matériau calibré, le changement quantifiable étant indicatif à la fois d'un degré de déformation et du nombre de cycles subis pendant les cycles de déformation répétés; (ii) déterminer une corrélation entre une étendue du changement quantifiable dans le matériau calibré et un effet sur ledit composé d'un nombre correspondant et d'un degré de cycles de déformation; (iii) fixer le matériau calibré audit composant pour soumettre le matériau calibré à n'importe quelle déformation subie par une partie adjacente du composant; (iv) déterminer au moins périodiquement l'étendue dudit changement quantifiable du matériau calibré pour déterminer l'étendue de la fatigue de tension cyclique subie par le composant.

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