Study On Coexistence Of Brittle And Ductile Fractures In Nano Reinforcement Composites Under Different Loading Conditions

Keywords

Brittle fracture; Ductile fracture; Particulate reinforced material

Abstract

Experimental study on high volume fraction of metallic matrix nano composites (MMNCs) was conducted, including uniaxial tension, uniaxial compression, and three-point bending. The example materials were two magnesium matrix composites reinforced with 10 and 15% vol. SiC particles (50 nm size). Brittle fracture mode was exhibited under uniaxial tension and three-point bending, while shear dominated ductile fracture mode (up to 12% fracture strain) was observed under uniaxial compression. The original Modified Mohr–Coulomb (MMC) fracture model (Bai and Wierzbicki in Int J Fract 161:1–20, 2010; in a mixed space of stress invariants and equivalent strain) was transferred into a stress based MMC (sMMC) model. This model was demonstrated to be capable of predicting the coexistence of brittle and ductile fracture modes under different loading conditions for MMNCs. A material post-failure softening model was postulated along the damage accumulation to capture the above two different failure modes. This model was implemented to the Abaqus/Explicit as a material subroutine. Numerical simulations using finite element method well duplicated the material strength, fracture initiation sites and crack propagation modes of the Mg/SiC nano composites with a good accuracy. The proposed model has a good potential to predict fracture for a wide range of material with strength asymmetry and coexistence of brittle and ductile fractures modes.

Publication Date

4-1-2017

Publication Title

International Journal of Fracture

Volume

204

Issue

2

Number of Pages

205-224

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1007/s10704-016-0174-y

Socpus ID

85007238098 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85007238098

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