Damage based model to study the effect of notch introduction technique on the J-integral value of PolyOxyMethylene. (November 2015)

• Record Type: Journal Article
• Authors: Laiarinandrasana, Lucien; Ricard, Jonathan; Guigné, Fabrice; Cheng, Yin; Morgeneyer, Thilo F.; Helfen, Lukas
• Is Part Of: Engineering fracture mechanics. Volume 149(2015)
• Page Start: 214
• Page End: 229
• Publication Date: 2015-11
• Subjects: Semi-crystalline polymers -- Tomography -- Laminography -- Finite element -- J-integral -- Local approach to fracture; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2015.08.031
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: Local approach to fracture to investigate notch introduction process in polymers. X-ray laminography to inspect in 3D the damage mechanisms. Characterization of crack growth mechanisms on CT specimen. FE simulations with dedicated damage-based model capturing the micro-mechanisms. Effects of the notch introducing technique on the fracture toughness. Abstract: 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 J cr whereas non touching conditions, induced a damaged layer around the notch tip leading to a decrease in J cr .