Truss-like Discrete Element Method Applied to Damage Process Simulation in Quasi-Brittle Materials

Tanzi, Boris Nahuel Rojo; Birck, Gabriel; Sobczyk, Mario; Iturrioz, Ignácio; Lacidogna, Giuseppe

doi:10.3390/app13085119

Cited by 4 publications

References 53 publications

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A new approach on constitutive modeling for quasi-brittle materials under multiaxial loading

Guo

2024

J. Stat. Mech.

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This work introduces a new method for expanding unidimensional models to predict material behavior under multiaxial loading. The concept of six-dimensional mechanical space is adopted, and in each basis direction of the space, there is one fiber-bundle model (FBM), so these six FBMs are independent amongst one another but follow the same damage evolution rule. Under triaxial loading, these FBMs have different stress and strain states, so six corresponding damage variables have different values. The anisotropic damage is thus represented by the six damage variables. When it is under uniaxial loading, the six-dimensional space reduces to one-dimensional space, so the proposed model can be calibrated using uniaxial loading test data, and the calibrated model can predict the material behavior under multiaxial loading conditions. Biaxial loading and triaxial loading test data are used to verify the proposed model, and parametric analyses are performed to analyze model predictions under different loading conditions. It shows that model predictions agree well with the test data and are consistent with experimental observations.

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A new approach on constitutive modeling for quasi-brittle materials under multiaxial loading

Guo

2024

J. Stat. Mech.

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Physical parameter measurement and discrete element simulation parameter calibration with fresh Rhizoma polygonati

Zheng,

Hu,

Yang

et al. 2024

Preprint

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This study is aimed to solve the parameter shortage during discrete element method (DEM) simulation in mechanized deseeding of fresh Rhizoma polygonati, and to calibrate DEM simulation parameters of fresh R. polygonati using physical measurement and simulation trials. First, the physical properties of fresh R. polygonati from picking to 15 days of stacking, and the contact parameters between fresh R. polygonati and different materials along with the prolonging of stacking days were measured through physical experiments. Based on the physical test results, the parameters significantly affecting the repose angle of fresh R. polygonati were screened out via Plackett-Burman test. The collision recovery coefficient, static friction coefficient, and rolling friction coefficient between fresh R. polygonati fruits all significantly affected the repose angle of fresh R. polygonati. On basis of Plackett-Burman test, a steepest ascent test was designed to further clarify the ranges of the significant parameters. Targeting at the actual repose angle of fresh R. olygonati (27.23°), we conducted Box-Behnken test and obtained the optimal parameter combination for DEM simulation of fresh R. polygonati. Verification tests showed the relative errors between the simulated values and measured values of repose angle in fresh R. polygonati were less than 3%, which proves the DEM simulation parameters are reliable.

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Damage Evolution in Quasi-Brittle Materials: Experimental Analysis by AE and Numerical Simulation

Rojo Tanzi,

Sobczyk,

Iturrioz

et al. 2023

Applied Sciences

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This work investigates the extension of a total-collapse prediction method to include local failures in quasi-brittle materials as they undergo damage processes. The analysis is experimentally conducted with acoustic emission data from a basalt specimen under a prescribed displacement loading test. The proposed failure index is compared with the well-established b-value to evaluate its usefulness; the simulation results are also used to further investigations. In particular, the simulations show that the parameter calculation can be carried out by indirectly estimating the elastic energy released within the system throughout the damage process, which cannot be measured directly. It is concluded that the proposed method is valid, consistently outperforming the b-value as a failure precursor throughout the experimental studies.

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Truss-like Discrete Element Method Applied to Damage Process Simulation in Quasi-Brittle Materials

Cited by 4 publications

References 53 publications

A new approach on constitutive modeling for quasi-brittle materials under multiaxial loading

A new approach on constitutive modeling for quasi-brittle materials under multiaxial loading

Physical parameter measurement and discrete element simulation parameter calibration with fresh Rhizoma polygonati

Damage Evolution in Quasi-Brittle Materials: Experimental Analysis by AE and Numerical Simulation

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