Damage based model to study the effect of notch introduction technique on the J-integral value of PolyOxyMethylene

Lucien Laiarinandrasana (1) , Jonathan Ricard (1) , Fabrice Guigné (2) , Yin Cheng (3, 1) , Thilo F. Morgeneyer (1) , Lukas Helfen (4, 3)

1 MAT - Centre des Matériaux
2 PSA Peugeot Citroën
3 ANKA - Institute for Photon Science and Synchrotron Radiation
4 ESRF - European Synchrotron Radiation Facility

Experimental data on a CT specimen made of PolyOxyMethylene were enriched by in situ laminographic observations in 3D. The observed micro-mechanisms of crack initiation and growth have been simulated by using a damage based model. A critical value of J -integral was determined. The same model was utilized to simulate an initially heterogeneous porosity in the CT specimen to mimic the state of the material after a cutting process. A notch tip touching tool led to a less compliant specimen and a higher value of critical JcrJcr whereas non touching conditions, induced a damaged layer around the notch tip leading to a decrease in JcrJcr.

Mots clés: Semi-crystalline polymers; Tomography; Laminography; Finite element; J-integral; Local approach to fracture

Domaines: Physique [physics]; Matière Condensée [cond-mat]; Science des matériaux [cond-mat.mtrl-sci]

Lucien Laiarinandrasana, Jonathan Ricard, Fabrice Guigné, Yin Cheng, Thilo F. Morgeneyer, et al.. Damage based model to study the effect of notch introduction technique on the J-integral value of PolyOxyMethylene. Engineering Fracture Mechanics, 2015, 149, pp.214-229. ⟨10.1016/j.engfracmech.2015.08.031⟩. ⟨hal-01272301⟩