Quantitative simulation of mechanical properties of porous ceramic materials by discrete element method

Zhou, Shuang; Su, Jinglin; Liu, XiaoXing; An, BaiGang; Yin, Yilong; He, Hongliang; Zhang, Quan; Feng, Yongjin; Wang, Xiao Yu

doi:10.1360/sspma2018-00332

Cited by 1 publication

(6 citation statements)

References 28 publications

(44 reference statements)

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“…The sample sizes are around 30 d p ( x –) × 30 d p ( y –) × 60 d p ( z –). Our previous tests show that under this condition the size effect can be safely excluded 22,24 . Both tensile and compressive loading tests (along z – direction) are performed.…”

Section: Sample Generation and Simulation Settingmentioning

confidence: 98%

“…Bond breaks once the maximal tensile (shear) stress exceeds the critical tensile (shear) strength. Following our previous works, 22‐24 here we assume the same strengths in tension and shear. The critical strength of bond σ b is obtained by a stress intensity factor associated with the stress singularity at the edge of the bond, 32

σ_{b} = \sqrt{\frac{E}{1 - v^{2}} \frac{Γ}{π a_{b}}}

where Γ is the bond toughness and is approximated by the surface energy contribution ( Γ = 2γ s ).…”

Section: Model Descriptionmentioning

confidence: 99%

“…For the obtained samples, bonds are installed once the center to center distance between particles is smaller than the sum of radii. Similar to our previous works, 22‐24 the radius of bond is derived based on sintering theory rather than the geometrical intersection of two overlapping particles, and is calculated using Coble's model, 38

a_{b}^{2} = 4 R^{*} h

where h is the overlap between the particles.…”

Section: Sample Generation and Simulation Settingmentioning

confidence: 99%

“…Thus, the centripetal loading condition is not ensured in our particle loading cases. Following our previous works, 22‐24 density scaling strategy together with very small loading velocity are used to ensure quasi‐static conditions. It should be pointed out that, depending on the exact loading pattern, the compressed aggregate may slip out without crushing.…”

Section: Sample Generation and Simulation Settingmentioning

confidence: 99%

“…For 2D simulations, the rotational effect cannot be considered in shear direction, thus compressed sample is generally failed in tensile mode 20,21 . Our previous works show that, once the contribution of rotational moments to the shear stress is considered in 3D simulations, the fraction of bond broken in shear mode is comparable to that in tensile mode 22‐24 …”

Section: Introductionmentioning

confidence: 99%

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DEM investigation on the breakage of spherical aggregate under multi‐contact loadings

et al. 2021

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Particle crushing is commonly encountered during the storage, transportation, and handling of granular assemblies. This work is aimed at ascertaining the applicability of four particle breakage criteria frequently mentioned in literature. Discrete element method (DEM) simulations were conducted to investigate the crushing of spherical aggregates under multicontact loadings. Mean and major principal stress criteria, octahedral shear stress criterion, and maximal contact force (MCF) criterion were then evaluated based on the obtained DEM results. It is found that the first three parameters all vary with the number of loading contacts, demonstrating they cannot predict the crushing of particles under arbitrary loading configuration. Simulation results indicate that the MCF at crushing is related to the number and the spatial arrangement of loading contacts. Thus, strictly speaking, this parameter cannot uniquely define particle breakage either. The influences of the microstructural heterogeneity on the breakage strength of particle and also on the applicability of MCF criterion are discussed.

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Section: Sample Generation and Simulation Settingmentioning

confidence: 98%