Simulation of Fracture Coalescence in Granite via the Combined Finite–Discrete Element Method

Euser, Bryan; Rougier, Esteban; Lei, Zhou; Knight, Earl E.; Frash, Luke P.; Carey, J. William; Viswanathan, Hari; Munjiza, Antonio

doi:10.1007/s00603-019-01773-0

Cited by 66 publications

(22 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…HOSS has been used to simulate a diverse array of problems, ranging from lab-scale experiments [10,40,41] to earthquake rupture [42,43]. Although HOSS has been used to model small-scale, high strain-rate impact problems in the past [44][45][46], this is the first time it has been used in the context of large-scale impact modeling.…”

Section: Hoss-finite-discrete Element Methodsmentioning

confidence: 99%

“…The simulations concluded shortly after the shock wave reflected off of the boundary of the target domain, 7.5 km from the point of impact. The mesh consisted of evenly sized triangular elements that varied with the cppr of interest (5,10,20). Figure 3 illustrates the 3D HOSS simulation domain that consisted of a spherical aluminum impactor with diameter 1 km and a 7.5 km radius hemispherical target.…”

Section: Hoss Setupmentioning

confidence: 99%

“…This work presents a code-to-code comparison between a hydrodynamics code (hydrocode) and a finite-discrete element method (FDEM) code. The hydrocode approach is a more traditional approach for addressing impact cratering problems [4][5][6][7][8][9], while the FDEM approach has been traditionally used for brittle fracture in geomaterials [10][11][12]. These approaches are operative on similar spatial scales, but the underlying formulation, particularly in how each approach accounts for damage, is very different.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Benchmarking Numerical Methods for Impact and Cratering Applications

et al. 2021

Self Cite

View full text Add to dashboard Cite

Large scale computational models are important for studying impact cratering events that are prevalent both on Earth and, more broadly, in this solar system. To address these problems, models must reliably account for both large length scales (e.g., kilometers) and relatively long time scales (hundreds of seconds). This work benchmarks two such approaches, a more traditional hydrodynamics approach and a finite-discrete element method (FDEM), for impact cratering applications. Both 2D and 3D results are discussed for two different impact velocities, 5 km/s and 20 km/s, striking normal to the target and, for 3D simulations, 45° from vertical. In addition, comparisons to previously published data are presented. Finally, differences in how these methods model damage are discussed. Ultimately, both approaches show successful modeling of several different impact scenarios.

show abstract

Section: Hoss-finite-discrete Element Methodsmentioning

confidence: 99%

Section: Hoss Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Benchmarking Numerical Methods for Impact and Cratering Applications

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…In this regard, HOSS has modeled split Hopkinson bar experiments on granite [69], producing excellent comparison to experimental data in addition to capturing the complex crack networks that evolve during high-rate loading conditions. Furthermore, HOSS has directly compared simulated and experimental fracture patterns in granite samples under low-rate compressive loads [71]. HOSS simulated experimental fracture patterns in shale have also been compared with promising results in Carey et.…”

Section: Hoss Simulations and Fdem Model For Dynamic Fracturementioning

confidence: 98%

“…The sample is considered as failed when a set of fractures connect the two opposite boundaries of the domain. HOSS has been previously validated for several applications and it is shown to be reliable [49,[69][70][71]. Validation of HOSS that may be of particular interest is cases addressing the brittle failure of geomaterials.…”

Section: Hoss Simulations and Fdem Model For Dynamic Fracturementioning

confidence: 99%

Surrogate Models for Estimating Failure in Brittle and Quasi-Brittle Materials

et al. 2019

View full text Add to dashboard Cite

In brittle fracture applications, failure paths, regions where the failure occurs and damage statistics, are some of the key quantities of interest (QoI). High-fidelity models for brittle failure that accurately predict these QoI exist but are highly computationally intensive, making them infeasible to incorporate in upscaling and uncertainty quantification frameworks. The goal of this paper is to provide a fast heuristic to reasonably estimate quantities such as failure path and damage in the process of brittle failure. Towards this goal, we first present a method to predict failure paths under tensile loading conditions and low-strain rates. The method uses a k-nearest neighbors algorithm built on fracture process zone theory, and identifies the set of all possible pre-existing cracks that are likely to join early to form a large crack. The method then identifies zone of failure and failure paths using weighted graphs algorithms. We compare these failure paths to those computed with a high-fidelity fracture mechanics model called the Hybrid Optimization Software Simulation Suite (HOSS). A probabilistic evolution model for average damage in a system is also developed that is trained using 150 HOSS simulations and tested on 40 simulations. A non-parametric approach based on confidence intervals is used to determine the damage evolution over time along the dominant failure path. For upscaling, damage is the key QoI needed as an input by the continuum models. This needs to be informed accurately by the surrogate models for calculating effective moduli at continuum-scale. We show that for the proposed average damage evolution model, the prediction accuracy on the test data is more than 90%. In terms of the computational time, the proposed models are ≈ O ( 10 6 ) times faster compared to high-fidelity fracture simulations by HOSS. These aspects make the proposed surrogate model attractive for upscaling damage from micro-scale models to continuum models. We would like to emphasize that the surrogate models are not a replacement of physical understanding of fracture propagation. The proposed method in this paper is limited to tensile loading conditions at low-strain rates. This loading condition corresponds to a dominant fracture perpendicular to tensile direction. The proposed method is not applicable for in-plane shear, out-of-plane shear, and higher strain rate loading conditions.

show abstract

Multiscale numerical investigation of ratchet growth damage effects in PBX 9502

Hagengruber,

Bennett,

Boyce

et al. 2023

Propellants Explo Pyrotec

View full text Add to dashboard Cite

This paper presents results of numerical experiments conducted on the high explosive PBX 9502 to investigate how recently observed grain‐scale damage mechanisms of ratchet growth [1] affect uniaxial compression measurements. Simulations are multiscale in the sense of directly resolving grains, pores, cracks, and grain‐interfaces based upon scanning electron microscope (SEM) images of damaged and undamaged samples. The combined finite‐discrete element method (FDEM) is utilized to resolve both grain‐scale microfracture and elastoplastic deformation of solid grains. Pristine (undamaged) and damaged microstructures are compared in simulation of unconfined compression tests of the same material from the literature. The simulation results show the observed microscale mechanisms of damage, specifically microfracture predominantly around and sometimes through grains and crack‐associated pore growth, can well‐explain the effective degradation of strength and stiffness observed in the laboratory measurements.

show abstract

Simulation of Fracture Coalescence in Granite via the Combined Finite–Discrete Element Method

Cited by 66 publications

References 39 publications

Benchmarking Numerical Methods for Impact and Cratering Applications

Benchmarking Numerical Methods for Impact and Cratering Applications

Surrogate Models for Estimating Failure in Brittle and Quasi-Brittle Materials

Multiscale numerical investigation of ratchet growth damage effects in PBX 9502

Contact Info

Product

Resources

About