Stable and Accurate LS-DYNA Simulations with Foam Material Models: Optimization of Finite Element Model Parameters

Ramaswamy, Karthik; Patham, Bhaskar; Savic, Vesna; Tripathy, Biswajit

doi:10.4271/2017-01-1338

Cited by 9 publications

(3 citation statements)

References 13 publications

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“…The 60 mm brittle mineral foam is modeled using both traditional Lagrangian models and SPH particles. The meshless approach of SPH has proven to be more robust for high compaction and high dislocation applications [28,29].…”

Section: Modeling Methodsmentioning

confidence: 99%

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Numerical modeling of brittle mineral foam in a sacrificial cladding under blast loading

Aminou

Belkassem

Atoui

et al. 2023

Mechanics & Industry

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Cellular materials, such as aluminum foams, have proven to be excellent energy absorbents. They can be used as crushable core in sacrificial cladding (SC) for blast load mitigation. In this study, the blast absorption capacity of a brittle mineral foam-based SC is investigated through finite element modeling using the LS-DYNA software. The experimental set-up used consists of a rigid steel frame with a square cavity of 300 mm x 300 mm in the center The structure to be protected is simulated by a thin aluminum plate clamped into the rigid steel frame. The blast load is generated by 20 g of C4 high explosive set at a distance of 250 mm from the center of the plate. The blast absorption capacity of the considered SC is evaluated by comparing the maximum out-of-plane displacement of the center of the plate with and without the protective brittle mineral foam. The presence of the brittle mineral foam reduces the maximum out-of-plane displacement of the center of the plate at least by a factor of two. The brittle mineral foam is modeled both in solid elements and smoothed-particle hydrodynamics (SPH) by using Fu Chang's constitutive material law based exclusively on the results of quasi-static compression tests of the foam and a phenomenological relationship between stress, strain and strain rate. The SPH model predicts the maximum out-of-plane displacement of the center of the aluminum plate with an average relative error of 5% with respect to the experimental values.

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Section: Modeling Methodsmentioning

confidence: 99%

“…Constitutive models for foams such as Low Density Foam, Crushable Foam, and Fu Chang Foam have been proposed in the past [28,29]. The present study adopts the Fu Chang Foam model.…”

Section: Materials Modelingmentioning

confidence: 99%

Numerical modeling of brittle mineral foam in a sacrificial cladding under blast loading

Aminou

Belkassem

Atoui

et al. 2023

Mechanics & Industry

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“…A linear function was used to load the specimen from zero to 5 kN, as a concentrated force on the tabbed composite adherend end. For stable quasi-static simulations in the explicit finite-element solver, judicious use of mass scaling or time/velocity scaling, or hybrid scaling is necessary [41][42][43]. In this study, time/velocity scaling, where the 5 kN load was applied in 25 ms, was employed.…”

Section: Metalmentioning

confidence: 99%

Influence of adhesive spew geometry and load eccentricity angle on metal-composite bonded joints tested at quasi-static and dynamic loading rates

Ramaswamy

O’Higgins

McCarthy

et al. 2022

Composite Structures

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Numerical study on the influence of cell gas on the compression behavior of expanded polypropylene

Grüber,

Koch,

Müller‐Pabel

et al. 2024

J of Applied Polymer Sci

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Expanded polypropylene (EPP) bead foam mainly consists of entrapped gas within closed polymer cells. This numerical study presents a method to account for the influence of this entrapped gas on the compression behavior of EPP foam. The method developed combines a finite element (FE) model of the foam structure with a smoothed particle hydrodynamics model to simulate the effect of the cell gas. The foam structure is modeled using the open‐source software neper, the FE simulations are conducted using the explicit FE solver of LS‐Dyna. Numerically obtained stress–strain curves for the investigated foam materials, both with and without considering the cell gas, are compared with experimental data from tests using a specially designed vacuum test chamber. The comparison shows a good agreement between numerical and experimental results, indicating that entrapped cell gas increases the structural stiffness under compression. However, in load‐hold‐unload tests, the numerical model fails to accurately capture the stress relaxation behavior observed during the hold phase of the experiment. This study highlights the significant impact of cell gas on the compression behavior of EPP foam and the need for further refinement in simulation strategy to capture effects like the stress relaxation and multiaxial loading.

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Stable and Accurate LS-DYNA Simulations with Foam Material Models: Optimization of Finite Element Model Parameters

Cited by 9 publications

References 13 publications

Numerical modeling of brittle mineral foam in a sacrificial cladding under blast loading

Numerical modeling of brittle mineral foam in a sacrificial cladding under blast loading

Influence of adhesive spew geometry and load eccentricity angle on metal-composite bonded joints tested at quasi-static and dynamic loading rates

Numerical study on the influence of cell gas on the compression behavior of expanded polypropylene

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