Physical validation of simulators in computer graphics

Romero, Victor; Ly, Mickaël; Rasheed, Abdullah Haroon; Charrondière, Raphaël; Lazarus, A. J.; Neukirch, Sébastien; Bertails-Descoubes, Florence

doi:10.1145/3450626.3459931

Cited by 18 publications

(3 citation statements)

References 89 publications

(109 reference statements)

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“…To this end, we develop an unclamped, 2D version of the Super-Helix model for discrete Kirchhoff rods 18 with a full account of dry frictional contact 19 . In section 'Simulations' we provide a detailed description of our rod simulator augmented with frictional contact, which has been recently validated in 2D and 3D 20 , in particular on the 2D pinning test 21 , which couples elasticity and frictional contact. We run a new validation test, by comparing our simulator to the analytical master curve of Yoshida et al 12 (Supplementary Fig.…”

Section: Experimental Results Overviewmentioning

confidence: 99%

“…In practice, we use the so-bogus library 32 which offers a free, robust, and efficient implementation of non-smooth frictional contact solvers based upon the hybrid algorithm first proposed by Daviet et al 19 . We note that the coupling between the Super-Circle model and so-bogus has been carefully validated 20 on the stick-slip scenario of a straight indenting rod (pinning test), first introduced by Sano et al 21 . We further improve the model by devising an arc-arc detection scheme, and validate our complete numerical model on a curved rod contacting a cylinder 12 (see Supplementary Note 1).…”

Section: Simulationsmentioning

confidence: 99%

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Randomly stacked open cylindrical shells as functional mechanical energy absorber

Sano,

Hohnadel,

Kawata

et al. 2023

Commun Mater

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Structures with artificially engineered mechanical properties, often called mechanical metamaterials, are interesting for their tunable functionality. Various types of mechanical metamaterials have been proposed in the literature, designed to harness light or magnetic interactions, structural instabilities in slender or hollow structures, and contact friction. However, most of the designs are ideally engineered without any imperfections, in order to perform deterministically as programmed. Here, we study the mechanical performance of randomly stacked cylindrical shells, which act as a disordered mechanical metamaterial. Combining experiments and simulations, we demonstrate that the stacked shells can absorb and store mechanical energy upon compression by exploiting large deformation and relocation of shells, snap-fits, and friction. Although shells are oriented randomly, the system exhibits statistically robust mechanical performance controlled by friction and geometry. Our results demonstrate that the rearrangement of flexible components could yield versatile and predictive mechanical responses.

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Section: Experimental Results Overviewmentioning

confidence: 99%

Section: Simulationsmentioning

confidence: 99%

Randomly stacked open cylindrical shells as functional mechanical energy absorber

Sano,

Hohnadel,

Kawata

et al. 2023

Commun Mater

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“…Physical hair parameters. We set the geometrical and physical parameters of our fibres using realistic hair parameters [Robbins 2012].…”

Section: Benchmark Setupmentioning

confidence: 99%

Contact detection between curved fibres: high order makes a difference

Crespel,

Hohnadel,

Metivet

et al. 2024

ACM Trans. Graph.

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Computer Graphics has a long history in the design of effective algorithms for handling contact and friction between solid objects. For the sake of simplicity and versatility, most methods rely on low-order primitives such as line segments or triangles, both for the detection and the response stages. In this paper we carefully analyse, in the case of fibre systems, the impact of such choices on the retrieved contact forces. We highlight the presence of artifacts in the force response that are tightly related to the low-order geometry used for contact detection. Our analysis draws upon thorough comparisons between the high-order super-helix model and the low-order discrete elastic rod model. These reveal that when coupled to a low-order, segment-based detection scheme, both models yield spurious jumps in the contact force profile. Moreover, these artifacts are shown to be all the more visible as the geometry of fibres at contact is curved. In order to remove such artifacts we develop an accurate high-order detection scheme between two smooth curves, which relies on an efficient adaptive pruning strategy. We use this algorithm to detect contact between super-helices at high precision, allowing us to recover, in the range of wavy to highly curly fibres, much smoother force profiles during sliding motion than with a classical segment-based strategy. Furthermore, we show that our approach offers better scaling properties in terms of efficiency vs. precision compared to segment-based approaches, making it attractive for applications where accurate and reliable forces are desired. Finally, we demonstrate the robustness and accuracy of our fully high-order approach on a challenging hair combing scenario.

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Simulating Thin Shells by Bicubic Hermite Elements

Ni,

Chen,

et al. 2024

Computer-Aided Design

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Physical validation of simulators in computer graphics

Cited by 18 publications

References 89 publications

Randomly stacked open cylindrical shells as functional mechanical energy absorber

Randomly stacked open cylindrical shells as functional mechanical energy absorber

Contact detection between curved fibres: high order makes a difference

Simulating Thin Shells by Bicubic Hermite Elements

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