Micromechanics-Based Damage Analysis of Fracture in Ti5553 Alloy with Application to Bolted Sectors

Mohamed Ben Bettaieb (1, 2) , Thibaut van Hoof (3) , Hans Minnebo (3) , Thomas Pardoen (4) , Philippe Dufour (4) , Pascal J. Jacques (4) , Anne-Marie Habraken (5, 1)

1 ArGEnCo - ArGEnCo Department, MS2F Division
2 LEM3 - Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux
3 Cenaero
4 IMMC - Institute of Mechanics, Materials and Civil Engineering [Louvain]
5 ARGENCO - Université de Liège (FNRS, Dpt ARGENCO)

A physics-based, uncoupled damage model is calibrated using cylindrical notched round tensile specimens made of Ti5553 and Ti-6Al-4V alloys. The fracture strain of Ti5553 is lower than for Ti-6Al-4V in the full range of stress triaxiality. This lower ductility originates from a higher volume fraction of damage sites. By proper heat treatment, the fracture strain of Ti5553 increases by almost a factor of two, as a result of a larger damage nucleation stress. This result proves the potential for further optimization of the damage resistance of the Ti5553 alloy. The damage model is combined with an elastoviscoplastic law in order to predict failure in a wide range of loading conditions. In particular, a specific application involving bolted sectors is addressed in order to determine the potential of replacing the Ti-6Al-4V by the Ti5553 alloy.

Mots clés: aircraft engine; complex loading; ductile fracture; FE validation; notched samples; stress triaxiality; Thomason model

Domaines: Matériaux; Mécanique [physics.med-ph]; Mécanique des matériaux [physics.class-ph]; Mécanique des solides [physics.class-ph]

Mohamed Ben Bettaieb, Thibaut van Hoof, Hans Minnebo, Thomas Pardoen, Philippe Dufour, et al.. Micromechanics-Based Damage Analysis of Fracture in Ti5553 Alloy with Application to Bolted Sectors. Journal of Materials Engineering and Performance, 2015, 24 (3), pp.1262-1278. ⟨10.1007/s11665-015-1383-7⟩. ⟨hal-01201780⟩