<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>This paper demonstrates the importance of a proper contact algorithm selection when a constitutive model is correlated and validated, especially in the case of brittle materials. A parametric study is carried out to study the influence of contact parameters on the outcomes of the numerical simulations of a dynamic compression test. The split Hopkinson pressure bar (SHPB) model is developed, and sandstone rock is considered as a representative material having considerably different properties compared to SHPB bars. The finite element method (FEM) and smoothed particle hydrodynamics (SPH) were used to simulate specimen behaviour using a LS-Dyna solver. Two contact types based on the penalty method are analysed: nodes to surface (FEM and SPH) and surface to surface (FEM only). Furthermore, three approaches of contact stiffness calculation are used for each contact type. The waveform data and failure patterns are then compared among all simulated cases and the corresponding experimental outcomes. It is found that the soft constraint stiffness (<italic>SOFT = 1)</italic> provides the best outcomes, especially in the case of one-way contact, and is nearly insensitive to stiffness scaling parameters. By contrast, standard (<italic>SOFT</italic> = 0) and segment-based (<italic>SOFT</italic> =2) approaches require a substantial effort in adjusting the stiffness scaling parameters to obtain satisfactory results. This paper provides valuable guidance for correlating and validating parameters of constitutive models for rock and other brittle materials in the SHPB test.</p>
</abstract>

This paper demonstrates the importance of a proper contact algorithm selection when a constitutive model is correlated and validated, especially in the case of brittle materials. A parametric study is carried out to study the influence of contact parameters on the outcomes of the numerical simulations of a dynamic compression test. The split Hopkinson pressure bar (SHPB) model is developed, and sandstone rock is considered as a representative material having considerably different properties compared to SHPB bars. The finite element method (FEM) and smoothed particle hydrodynamics (SPH) were used to simulate specimen behaviour using a LS-Dyna solver. Two contact types based on the penalty method are analysed: nodes to surface (FEM and SPH) and surface to surface (FEM only). Furthermore, three approaches of contact stiffness calculation are used for each contact type. The waveform data and failure patterns are then compared among all simulated cases and the corresponding experimental outcomes. It is found that the soft constraint stiffness (SOFT = 1) provides the best outcomes, especially in the case of one-way contact, and is nearly insensitive to stiffness scaling parameters. By contrast, standard (SOFT = 0) and segment-based (SOFT =2) approaches require a substantial effort in adjusting the stiffness scaling parameters to obtain satisfactory results. This paper provides valuable guidance for correlating and validating parameters of constitutive models for rock and other brittle materials in the SHPB test.

Study of Contact Algorithms Influencing Specimen Response in Numerical Simulation of Dynamic Compression Test

Faculty of Mechanical Engineering, Institute of Mechanics and Computational Engineering

Acta Mechanica et Automatica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

This paper demonstrates the importance of a proper contact algorithm selection when a constitutive model is correlated and validated, especially in the case of...

Study of Contact Algorithms Influencing Specimen Response in Numerical Simulation of Dynamic Compression Test

Publié en ligne: 26 juin 2024

Pages: 252 - 273

Reçu: 11 août 2023

Accepté: 26 sept. 2023

DOI: https://doi.org/10.2478/ama-2024-0029

Mots clés
JH-2 constitutive model, sandstone, rock, SHPB, LS-DYNA

© 2024 Paweł Baranowski et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Study of Contact Algorithms Influencing Specimen Response in Numerical Simulation of Dynamic Compression Test

Publié en ligne: 26 juin 2024

Pages: 252 - 273

Reçu: 11 août 2023

Accepté: 26 sept. 2023

DOI: https://doi.org/10.2478/ama-2024-0029

Mots clésJH-2 constitutive model, sandstone, rock, SHPB, LS-DYNA

© 2024 Paweł Baranowski et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Mots clés
JH-2 constitutive model, sandstone, rock, SHPB, LS-DYNA