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The Assembly and Application of 'Shear Rings': A Novel Endothelial Model for Orbital, Unidirectional and Periodic Fluid Flow and Shear Stress
Published on: October 31, 2016
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Plastic flow anisotropy drives shear fracture.
A Amine Benzerga1,2, Nithin Thomas3, Joshua S Herrington3
1Texas A&M University, Department of Aerospace Egineering, College Station, TX, 77843-3141, USA. benzerga@tamu.edu.
Scientific Reports
|February 7, 2019
Summary
Anisotropic plasticity can trigger shear bands, leading to ductile solid fracture. This study uses 3D simulations to reveal mechanisms behind shear banding, offering insights for material design and rock fracture understanding.
Area of Science:
- Materials Science
- Solid Mechanics
- Computational Mechanics
Background:
- Fracture in crack-free solids often results from plastic instabilities like shear bands.
- Previous simulations of shear banding were limited to 2D planar geometries.
- Understanding shear banding is crucial for predicting material failure.
Purpose of the Study:
- To investigate the role of anisotropic plasticity in triggering shear bands.
- To explore shear banding mechanisms in axisymmetric tensile test specimens using 3D simulations.
- To provide a micromechanical model for shear banding in ductile solids.
Main Methods:
- Three-dimensional finite-element simulations were employed.
- An axisymmetric tensile test rig was used as the simulation setup.
- Micromechanical modeling covered various competing failure mechanisms.
Main Results:
- Anisotropic plasticity was shown to effectively trigger shear bands.
- Shear localization, rarely observed in this setup, was successfully simulated.
- The study provides a novel 3D simulation approach for shear banding.
Conclusions:
- Anisotropic plasticity is a key factor in causing shear bands and ductile fracture.
- Results aid in rationalizing shear fracture in ductile rocks.
- Findings can inform the design of advanced materials with mitigated fracture risks.
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