Effect of a Post-Fatigue Damage on the Residual Dynamic Behavior of Advanced-SMC Composites

Mohammadali Shirinbayan (1) , Joseph Fitoussi (1) , Fodil Meraghni (2) , S. Farzaneh (3) , Benjamin Surowiec (4) , Abbas Tcharkhtchi (1)

1 PIMM - Laboratoire Procédés et Ingénierie en Mécanique et Matériaux
2 LEM3 - Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux
3 P4Tech - P4Tech
4 Sigmatech - Plastic Omnium Auto Exterior

The purpose of this article is to investigate the effect of an initial pre-damage induced by a fatigue loading on the tensile dynamic behavior of Advanced Sheet Molding Compounds (A-SMC). Tension-tension fatigue preloading at a frequency of 30 Hz is performed at various applied stress levels prior to subject the A-SMC specimens to tensile tests at different strain rates, namely: 10 −3 s −1 (quasi-static), 1 s −1 and 60 s −1 . The developed experimental approach provided significant findings in terms of residual behavior and damage accumulation in relation to the applied pre-fatigue loading conditions. Indeed, it has been shown that the overall quasi-static and the dynamic responses are strongly affected by the level of fatigue number of cycles reached prior to applying the high strain loading. The effect of fatigue pre-damage is found also strongly strain-rate dependent. Experimental results showed that the damage threshold in terms of stress and strain increased with strain rate. However, for a given strain-rate the damage stress threshold depends on the number of cycles applied during the fatigue preloading.

Mots clés: Pre-damage; Dynamic; Residual behavior

Mots clés: Fatigue

Domaines: Mécanique des matériaux [physics.class-ph]

Mohammadali Shirinbayan, Joseph Fitoussi, Fodil Meraghni, S. Farzaneh, Benjamin Surowiec, et al.. Effect of a Post-Fatigue Damage on the Residual Dynamic Behavior of Advanced-SMC Composites. Applied Composite Materials, 2019, pp.1-19. ⟨10.1007/s10443-019-09782-6⟩. ⟨hal-02318740⟩