Molecular Dynamics Simulation of Brittle Fracture in Bcc Iron

Hong Xian Xie; Chong Yu Wang; Tao Yu

doi:10.4028/www.scientific.net/DDF.272.41

Paper Titles

Change of Properties of CMOS Image Sensor Irradiated with 9 and 16 MeV Protons
p.7

Solid-State Reaction in Al-Fe Binary System Induced by Mechanical Alloying
p.15

Thermal Behaviour of Xenon in a Refractory Metal for Gas Fast Reactor Fuel Elements
p.25

Solid-Phase Diffusion Interaction in Multilayer Thin-Film System Cr/Cu/Ni at Pulse Laser Heating
p.31

Molecular Dynamics Simulation of Brittle Fracture in Bcc Iron
p.41

Diffusion in the AlMo₃ Ordered Intermetallic
p.51

First-Principles Investigation of the Alloying Effect of Mn and Cr in the Kink on the Edge Dislocation in BCC Iron
p.61

Mathematical Modeling of Interface Movement during Diffusional Bonding of Surfaces
p.71

Growth Kinetics of Boride Layers: A Modified Approach
p.79

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Molecular Dynamics Simulation of Brittle Fracture in Bcc Iron

Abstract:

Crack propagation in bcc iron at different strains under low temperature (30K) has been studied using the atomistic simulation. We show that cracks display a brittle character of extension at low strains, and at relative higher strains cracks extend with a periodic series of twins(or SF) bursts. These bursts decrease the crack speed and produce velocity oscillations with an increase in energy dissipation that increases the toughness. Here we also develop a new form of dynamic fracture energy. Using our form of dynamic fracture energy, the results therefore are in quantitative agreement with the theoretical single-crack equation of motion.