Srovnání únavových kritérií pro kombinaci ohyb-krut na nitridovaných a hladkých vzorcích

Comparison of Fatigue Criteria for Combined Bending-torsion Loading of Nitrided and Virgin Specimens

abstract

en

This work deals with fatigue life of plasma-nitrided and virgin specimens made of the low-alloy high strength steel. Specimens were subjected to an in-phase combined bending-torsion loading. The plasma-nitride specimens exhibited a significantly improved fatigue resistance. The criterion proposed by McDiarmid was found to be the most precise in the fatigue life prediction for virgin specimens. On the other hand, the Matake criterion was the most successful for nitrided specimens.

Práce analyzuje únavovou životnost plazmaticky nitridovaných a hladkých vzorků z vysocepevné oceli. Vzorky byly podrobeny soufázovým zatěžováním v kombinaci ohyb-krut. Nitridované vzorky vykázaly podstané zvýšení životnosti. Jako nejlepší se jevilo McDiarmidovo kritérium pro hladké vzorky, zatímco Matakovo kritérium nejlépe popisovalo životnost nitridovaných vzorků.

This work deals with fatigue life of plasma-nitrided and virgin specimens made of the low-alloy high strength steel. Specimens were subjected to an in-phase combined bending-torsion loading. The plasma-nitride specimens exhibited a significantly improved fatigue resistance. The criterion proposed by McDiarmid was found to be the most precise in the fatigue life prediction for virgin specimens. On the other hand, the Matake criterion was the most successful for nitrided specimens.

Únavová životnost, ohyb-krut, nitridovaná vrstva, vysocepevná ocel.

Fatigue life, bending-torsion, nitrided layer, high strength steel.

29.06.2007

Vutium

Brno

148–148

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