Energy absorption of a helicoidal bistable structure

Leelavanichkul, Seubpong; Cherkaev, Andrej; Adams, Daniel O.; Solzbacher, Florian

doi:10.2140/jomms.2010.5.305

Cited by 12 publications

(9 citation statements)

References 13 publications

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“…The V-22 may be seen as a sort of bistable structure in which the main links correspond to the wings and the pylon to the waiting links. Additional numerical work on this idea was performed by Cherkaev and collaborators [8,9]. Since 2004, Whitman and La Saponara developed a physical proof-of-concept work of bistable structures for energy absorption, built either with metal or with composite materials [10][11][12], where main and waiting link parts were manufactured with the same type of materials.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Modeling and Experimental Characterization of Enhanced Hybrid Composite Structures for Improved Crashworthiness

Arronche

Martínez

Saponara

et al. 2013

Journal of Applied Mechanics

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¡n this work, two hybrid composite structures were designed, modeled, and tested for improved resistance to impact. They were inspired by bistable composite structures, which are structures composed of two parts: a so-called "main link" and a so-called "waiting link." These links work together as a mechanism that will provide enhanced damage tolerance, and the structure exhibits a bistable stress/strain curve under static tension. The function of the main link is to break early, at which point the waiting link becomes active and provides a redundant load path. The goal of the current study was to design, manufacture, and test a similar concept for impact loading and achieve greatly improved impact resistance per unit weight. In the current project, the main link was designed to be a brittle composite material (in this case, woven carboniepoxy) exposed to impact, while the waiting link was chosen to be made with a highly nonlinear and strong composite material (in this case, polyethylenelepoxy), on the opposite surface. Hence, the structure, if proven successful, can be considered an enhanced hybrid concept. An explicit finite element (FE) commercial code, LS-DYNA, was used to design and analyze the baseline as well as two proposed designs. The simulations' methodology was validated with results published in the literature, which reported tests from linear fiberreinforced composites. The plots were obtained via the ASCII files generated fiom the FE code, processed using MATLAB®, and compared to experimental impact tests. An instrumented drop-weight testing machine performed impact tests, and a high-speed camera validated the specimens' displacement under impact. It is shown that the FF model provided qualitative behavior very consistent with the experiments but requires further improvements. Experimentally, it is shown that one of the two enhanced hybrid models leads to up to a 30% increase of returned energy/weight when compared to its baseline and, therefore, is worthy of further investigations,

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Section: Introductionmentioning

confidence: 99%

Finite Element Modeling and Experimental Characterization of Enhanced Hybrid Composite Structures for Improved Crashworthiness

Arronche

Martínez

Saponara

et al. 2013

Journal of Applied Mechanics

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“…More space is needed as the waiting element becomes longer and curvier. In this section, we suggest another configuration, a helicoid, (see [7,8]), which improves the spacing requirement. To avoid confusion in the terminology, the "main element/main-link" and "waiting element/waiting-link" previously used will be replaced with "main-strip" and "waiting-strip" to reflect the geometry of the structure in this section.…”

Section: Energy Absorption Of a Helicoidal Bistable Structurementioning

confidence: 99%

“…As yielding continues, an increasing portion of the applied load is transferred to the outer helicoidal waiting-strip. The paper [8] investigates an energy absorption concept of a helicoidal bistable structure using a simplified model where the central main-strip exhibits linear elastic material behavior to failure (brittle failure). The outer helicoidal waiting-strip is assumed to remain nonactive (unloaded) until the inner brittle main-strip fails.…”

Section: Energy Absorption Of a Helicoidal Bistable Structurementioning

confidence: 99%

“…The additional "twisting" degrees of freedom of the strip correspond to the additional energy released, in the process of the elongation. The location where the breakages occur does not affect the amount of the energy absorbed [8].…”

Section: Energy Absorption Of a Helicoidal Bistable Structurementioning

confidence: 99%

“…In Section 4, we discuss the bistability and its features [2,3]; in Section 6 and 7, we review the dynamics of bistable lattices from elastic-brittle material [5], and from elastic-plastic materials [6], respectively. In Section 8, new morphology of spiraling bistable structures [7,8] is discussed.…”

Section: Introductionmentioning

confidence: 99%

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Principles of Optimization of Structures Against an Impact

Cherkaev

Leelavanichkul

2011

J. Phys.: Conf. Ser.

Self Cite

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We discuss principles of design of optimal structure subjected to a dynamical load. The goal is to design a structure which is capable of sustaining an impact of a dynamical load (collision or blast) by absorbing and redistributing the energy of the collision and keeping the structural integrity. An unstructured material can absorb energy until it melts. However, a tiny portion of this energy yields to a construction's disintegration due to instability of the damage that leads to energy concentration. Appearance of concentrated damage zones, such as cracks or delaminating, destroys the construction. The remains of the disintegrated construction still can absorb a lot of energy. The goal of optimal design is to maximally use the ability of a damageable material to absorb energy. We develop a theory of macro-and micro behavior of damageable structures. Damage is understood as a process of irreversible phase transition from initial to damaged state. The wave of phase transition is described and the structural parameters are optimized. We propose a concept of a replaceable protective structure design. Such structure should dissipate maximum energy, be able to spread energy of damage, and the damage process should be as stable as possible. An optimized structure should trigger stress waves propagation and thereby spread the stress more evenly; it must also contain multiple energy absorbers. This can be achieved by the use of a composite with a special structure made of a strong frame, and an absorbing filler material. The absorbing rate and rate of damage propagation are times amplified by waiting-link structures that we describe below. The optimization strategy requires a proper choice of design parameters. They are: the shape of the whole protective construction, location of beams or frames and waiting links, and the choice of materials in the structure and in the outer layers.

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Damage propagation in 2d beam lattices: 2. Design of an isotropic fault-tolerant lattice

Cherkaev

Ryvkin

2019

Arch Appl Mech

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Energy absorption of a helicoidal bistable structure

Cited by 12 publications

References 13 publications

Finite Element Modeling and Experimental Characterization of Enhanced Hybrid Composite Structures for Improved Crashworthiness

Finite Element Modeling and Experimental Characterization of Enhanced Hybrid Composite Structures for Improved Crashworthiness

Principles of Optimization of Structures Against an Impact

Damage propagation in 2d beam lattices: 2. Design of an isotropic fault-tolerant lattice

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