THE INFLUENCE OF LOADING RATE ON J_R-CURVE OF 20 MnMoNi 5 5 STEEL USING THE KEY CURVE METHOD

Abstract

ResumeOn a etabli les courbes J-d'un acier 2 0 MnMoNi 5 5 . S diverses vitesses de chargementparK la methode de la courbe de reference. Pour cela on a 6tabli la courbe de r6f6rence par calculs aux 616ments finis en tenant compte de l'effet de vitesse de deformation sur le comportement plastique. On met en 6vidence la croissance des valeurs JR avec la vitesse de chargement.Abstract JR-curves of 2 0 MnMoNi 5 5 steel at different loading rates were determined using the key curve method. For this the key curve function was developed by FE-calculations in consideration of the yielding behaviour depending on strain rate. The evaluated JR-curves increased with higher loading rates.

Effect of irradiation-induced plastic flow localization on ductile crack resistance behavior of a 9%Cr tempered martensitic steel

“…It is known that the crack resistance is increased by the loading rate [68][69][70][71][72]. This elevation of crack resistance can be explained by the state of local stress-strain conditions prevailing ahead of the crack tip.…”