Quasi-static impact of indented foldcores

Gattas, Joseph M.; Zhang, You

doi:10.1016/j.ijimpeng.2014.06.001

Cited by 66 publications

(35 citation statements)

References 11 publications

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“…This is particularly detrimental for the indented foldcore, where imperfections suppress the travelling hinge line failure mode. This agrees with behaviour reported in Gattas and You (2014b) where foldcores with visible defects or imperfections with a magnitude greater than 25% t p did not exhibit travelling hinge behaviour. Comparisons of the observed experimental and imperfect numerical failure modes for both the foldcores are also shown in Fig.…”

Section: Numerical and Experimental Comparisonsupporting

confidence: 91%

“…The indented foldcore is a modified version of the standard foldcore proposed by the authors (Gattas and You, 2014b), Fig. 1(b).…”

Section: Honeycomb and Indented Foldcorementioning

confidence: 99%

“…Standard and indented foldcores were designed with approximately the same height and density. Parameters were set at the optimal indented configuration given in Gattas and You (2014b), for a ¼ 15 mm, b Ã ¼ 0:5; / ¼ 64:8 ; g A ¼ 95 , and for the indented foldcore, p Ã ¼ 0:067. The two curved-crease foldcore tessellations were designed with the standard foldcore parameters above, plus u ¼ p=2.…”

Section: Prototype Dimensions and Materialsmentioning

confidence: 99%

“…A periodic core unit was constructed and meshed from S4R shell elements and crushed between two flat, rigid plates. A mesh density of a=80 and a quasi-static loading rate of 2 m/s were selected following convergence studies, described fully in Gattas and You (2014b). The force-displacement response was obtained and converted to dimensionless values.…”

Section: Generation Of Geometric Imperfectionsmentioning

confidence: 99%

“…The geometric parameters used to explore the standard foldcore configuration space in Gattas and You (2014b) were reused for the curved-crease parametric study, with thirteen straight-crease bases set corresponding to models B1-B5, C1-C5, and D1-D5, excluding C4 and D3 which are identical to B4. Each configuration was run at three aspect ratios, b Ã ¼ 0:5; 1:0, and 2:0, and two tessellations, for a total of seventy-eight models.…”

Section: Geometrymentioning

confidence: 99%

See 4 more Smart Citations

The behaviour of curved-crease foldcores under low-velocity impact loads

Gattas

Zhang

2015

International Journal of Solids and Structures

Self Cite

105

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Section: Numerical and Experimental Comparisonsupporting

confidence: 91%

“…The indented foldcore is a modified version of the standard foldcore proposed by the authors (Gattas and You, 2014b), Fig. 1(b).…”

Section: Honeycomb and Indented Foldcorementioning

confidence: 99%

Section: Prototype Dimensions and Materialsmentioning

confidence: 99%

Section: Generation Of Geometric Imperfectionsmentioning

confidence: 99%

Section: Geometrymentioning

confidence: 99%

See 3 more Smart Citations

The behaviour of curved-crease foldcores under low-velocity impact loads

Gattas

Zhang

2015

International Journal of Solids and Structures

Self Cite

105

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Architected Origami Materials: How Folding Creates Sophisticated Mechanical Properties

et al. 2018

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devices, [26,27] to small-scale nano- [28][29][30] and DNA origamis. [31] A common theme in these studies is to exploit the sophisticated shape transformations from folding. For example, an origami robot is typically fabricated in a 2D flat configuration and then folded into the prescribed 3D shape to perform its tasks. The origamis have been treated essentially as linkage mechanisms in which rigid facets rotate around hingelike creases (aka "rigid-folding origami"). Elastic deformation of the constituent sheet materials or the dynamics of folding are often neglected. Such a limitation in scope indeed resonates the origin of this field, that is, folding was initially considered as a topic in geometry and kinematics.However, the increasingly diverse applications of origami require us to understand the force-deformation relationship and other mechanical properties of folded structures. Over the last decade, studies in this field started to expand beyond design and kinematics and into the domain of mechanics and dynamics. Catalyzed by this development, a family of architected origami materials quickly emerged (Figure 1). These materials are essentially assemblies of origami sheets or modules with carefully designed crease patterns. The kinematics of folding still plays an important role in creating certain properties of these origami materials. For example, rigid folding of the classical Miura-ori sheet induces an in-plane deformation pattern with auxetic properties (aka negative Poisson's ratios). [32,33] However, elastic energy in the deformed facets and creases, combined with their intricate spatial distributions, impart the origami materials with a rich list of desirable and even unorthodox properties that were never examined in origami before. For example, the Ron-Resch fold creates a unique tri-fold structure where pairs of triangular facets are oriented vertically to the overall origami sheet and pressed against each other. Such an arrangement can effectively resist buckling and create very high compressive load bearing capacity. [34] Other achieved properties include shape-reconfiguration, tunable nonlinear stiffness and dynamic characteristics, multistability, and impact absorption.Since the architected origami materials obtain their unique properties from the 3D geometries of the constituent sheets or modules, they can be considered a subset of architected cellular solids or mechanical metamaterials. [35][36][37][38][39] However, the origami materials have many unique characteristics. The rich geometries of origami offer us great freedom to tailor targeted Origami, the ancient Japanese art of paper folding, is not only an inspiring technique to create sophisticated shapes, but also a surprisingly powerful method to induce nonlinear mechanical properties. Over the last decade, advances in crease design, mechanics modeling, and scalable fabrication have fostered the rapid emergence of architected origami materials. These materials typically consist of folded origami sheets or modules with intricate 3D geomet...

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Foldcore Structures with Origami Initiators for Energy-Absorbing Sandwich Panels

Cheng

2023

Acta Mech. Solida Sin.

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Quasi-static impact of indented foldcores

Cited by 66 publications

References 11 publications

The behaviour of curved-crease foldcores under low-velocity impact loads

The behaviour of curved-crease foldcores under low-velocity impact loads

Architected Origami Materials: How Folding Creates Sophisticated Mechanical Properties

Foldcore Structures with Origami Initiators for Energy-Absorbing Sandwich Panels

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