Showing papers in "Extreme Mechanics Letters in 2018"

TL;DR: This work optimization a large-scale system not tractable by an exhaustive brute force approach and shows that it is a promising tool towards composite design offers a new perspective in the exploration of design spaces and accelerating the discovery of new functional, customizable composites.

TL;DR: Here, three key elements of bioinspired soft robots from a mechanics vantage point are reviewed, namely, materials selection, actuation, and design.

TL;DR: In this article, an untethered soft robot using soft electrostatic actuators is reported, which consists of a deformable body driven by dielectric elastomer actuators and two paper-based feet driven by electroadhesion actuators.

TL;DR: In this article, the authors describe the interactions that give rise to the structural heterogeneity of the extracellular matrix and present the techniques that are widely employed to measure ECM properties and remodeling dynamics.

TL;DR: It is demonstrated that this hybrid material system can be 3D printed as a soft dielectric elastomer actuator (DEA) with a unimorph configuration that is capable of generating high bending motion in response to an applied electrical stimulus.

TL;DR: In this article, an array of compressible hexagonal-structured triboelectric nanogenerators (CH-TENGs) was used for harvesting the mechanical energy from a rolling tire.

TL;DR: Inspired by the coupling geometrical relations of left-hand and right-hand climbing towel gourd tendrils within single branch, an innovative chiral architected cylindrical tube is proposed, which can convert axial compression loads into angular rotation deformation.

TL;DR: In this paper, the effect of nodes on the Young's modulus of lattice architectures with different unit cell geometries was quantified through simple analytical constructions, reduced-order computational models, and experiments at the milli-and micrometer scales.

TL;DR: In this paper, a new family of elastically-isotropic elementary cubic truss lattice structures is developed, eliminating the need of combining elementary structures to achieve elastic isotropy, which can be tailored at macroscopic level by changing the ratio of bending-toaxial stiffness of the constituent beams.

TL;DR: In this paper, the mechanical and electrical properties of a direct-spun carbon nanotube mat are measured, which consists of an interlinked random network of nanotubes, with approximately 40 wires in a bundle and a small degree of in-plane anisotropy.

TL;DR: In this paper, the out-of-plane compressive properties of honeycomb structures with variable-thickness cell edges are investigated through experimental analysis, and the experimental results illustrate that the honeycombs with the variable-thymm cell edges show enhanced compressive mechanical properties compared to the conventional honeycomb.

TL;DR: In this article, the authors carried out dilatant plasticity simulations to investigate the process of void-mediated failure inside a shear band and found that the material in the band may soften with no increase in the void volume fraction.

TL;DR: In this paper, a 3D kagome lattice structure was fabricated by selective laser melting with titanium alloy and compared with the theoretical predictions, and the experimental strength and load capacity were close to but a little higher than theoretical predictions under buckling.

TL;DR: In this paper, the dispersion characteristics of the phononic resonator (PR) were investigated and the metadamping amplification was verified in finite PR systems via a power flow approach that depicts the spatial rate of energy dissipation along the length of a 100 cells phononic Resonator.

TL;DR: In this article, the authors studied the dynamic response of a 1-D bistable lattice, i.e., a FPU chain with springs having a non-convex double-well energy potential.

TL;DR: In this article, the mechanics of a cellular Kirigami that rotates and buckles upon compression are studied. And the authors demonstrate the cell-based construction of laminates with multi-stable behavior and a rotary-linear boom actuator, as well as self-deploying cells with shape memory alloy hinges, for applications including deployable structures, soft robotics and medical devices.

TL;DR: In this paper, a large deformation isotropic elastic-viscoplastic theory for modeling the response of lithium is presented, which is implemented as a user-material-subroutine in a finite element program and calibrated using the data from the microindentation experiments of Wang and Cheng.

TL;DR: In this article, the authors proposed a novel design solution, which combines the advantages of both concepts, i.e., high force and stroke, based on a stack of high stroke (3mm) membrane DEAs.

TL;DR: In this paper, temperature and strain rate sensitivity of the triple-layer polypropylene (PP)/polyethylene (PE)/polypropylene(PP) porous separator for Li-ion batteries was studied experimentally under controlled temperatures of up to 120° (393 K), and strain rates (from 1 ⋅ 1 0 − 4 s − 1 to 0. 1 s−1 ).

TL;DR: This work reviews numerous critical diseases that are related to keratin, collagen, and elastin, and proposes ways of extensively utilizing multiscale modeling, from atomistic to coarse-grained molecular dynamics simulations, to uncover the molecular origins for some of these diseases and to aid in the development of novel cures and therapies.

TL;DR: In this article, a novel architectural paradigm that adds stepwise graded core-shell struts to bending dominated lattices to increase energy absorption up to 38 times with negligible changes in density or mass, i.e., less than ＋2.5%.

TL;DR: In this article, the authors explore the mechanical behavior of the origami hyperbolic paraboloid or hypar which is a bistable thin sheet structure with symmetric stable states.

TL;DR: In this article, the preferential buckling mode of conventional square lattice structures can be altered to pattern transformation by modifying the sections of the frame of the lattice structure, and there exists an effective modifying region.

TL;DR: This work investigates a new actuating mechanism for driving an origami structure, which results in simple and rapid prototyping of a soft robot.

TL;DR: Based on the flexure hinges as a mechanical elastomer, the FH-TENG can convert mechanical energy into electricity by utilizing the contact electrification between fluorinated ethylene propylene and copper films as mentioned in this paper.

TL;DR: In this paper, the wave propagation properties of one, two and three-dimensional tense-grity-based periodic structures were investigated, which are termed as tensegrity beams, plates and solids, respectively.

TL;DR: In this article, first-principles calculations to explore the mechanical properties of single-layer transition metal dichalcogenides (TMDD) structures were conducted. And the possibility of engineering of the electronic properties of these attractive 2D structures using the biaxial or uniuxial tensile loadings was analyzed, which confirmed the remarkable strength of this novel 2D system.

TL;DR: In this article, it was shown that localized necking can occur when the nominal electric field as a function of nominal electric displacement reaches a maximum under a dead load and the determinant of the Hessian of the free energy function becomes zero.

TL;DR: In this paper, the authors presented significantly simplified metamaterial architectures, which are composed of just one rather than eight hollow sealed functional elements within each cubic unit cell, and measured a negative effective compressibility of about κ eff = − 4. 7 % ∕ bar under pressure control.

TL;DR: In this article, the mechanical properties of single-layer borophene using molecular dynamics simulations based on a newly developed interatomic potential were analyzed and shown that the Young's modulus and fracture strength in the zigzag direction are much lower than those in the armchair direction.