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DEM modeling of shear bands in crushable and irregularly shaped granular materials

Zhou, Wei ; Yang, Lifu ; Ma, Gang ; Xu, Kun ; Lai, Zhiqiang ; Chang, Xiaolin

Granular matter, 2017-05, Vol.19 (2), p.1, Article 25 [Periódico revisado por pares]

Berlin/Heidelberg: Springer Berlin Heidelberg

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Título:
DEM modeling of shear bands in crushable and irregularly shaped granular materials
Autor: Zhou, Wei ; Yang, Lifu ; Ma, Gang ; Xu, Kun ; Lai, Zhiqiang ; Chang, Xiaolin
Assuntos: Aluminum alloys ; Assembly ; Atoms & subatomic particles ; Ball bearings ; Biaxial tests ; Chain branching ; Complex Fluids and Microfluidics ; Edge dislocations ; Engineering Fluid Dynamics ; Engineering Thermodynamics ; Foundations ; Fractal geometry ; Geoengineering ; Granular materials ; Heat and Mass Transfer ; Hydraulics ; Industrial Chemistry/Chemical Engineering ; Materials Science ; Microstructure ; Original Paper ; Particle size distribution ; Physics ; Physics and Astronomy ; Shear bands ; Shear strength ; Soft and Granular Matter
É parte de: Granular matter, 2017-05, Vol.19 (2), p.1, Article 25
Descrição: A method of modeling convex or concave polygonal particles is proposed. DEM simulations of shear banding in crushable and irregularly shaped granular materials are presented in this work. Numerical biaxial tests are conducted on an identical particle assembly with varied particle crushability. The particle crushing is synchronized with the development of macroscopic stress, and the evolution of particle size distribution can be characterized by fractal dimension. The shear banding pattern is sensitive to particle crushability, where one shear band is clearly visible in the uncrushable assembly and X-shaped shear bands are evident in the crushable assembly. There are fewer branches of strong force chains and weak confinement inside the shear bands, which cause the particles inside the shear bands to become vulnerable to breakage. The small fragments with larger rotation magnitudes inside the shear bands form ball-bearing to promote the formation of shear bands. While there are extensive particle breakages occurring, the ball-bearing mechanism will lubricate whole assembly. With the increase of particle crushability the shear band formation is suppressed and the shear resistance of the assembly is reduced. The porosity inside the shear bands are related to the particle crushability.
Editor: Berlin/Heidelberg: Springer Berlin Heidelberg
Idioma: Inglês

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DEM modeling of shear bands in crushable and irregularly shaped granular materials

Zhou, Wei ; Yang, Lifu ; Ma, Gang ; Xu, Kun ; Lai, Zhiqiang ; Chang, Xiaolin

Berlin/Heidelberg: Springer Berlin Heidelberg

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