Multistable mechanical metamaterials with highly tunable strength and energy absorption performance

2020 ◽  
pp. 1-13
Author(s):  
Haigui Fan ◽  
Yuchen Tian ◽  
Lijuan Yang ◽  
Dapeng Hu ◽  
Peiqi Liu
Keyword(s):  
Energy Absorption ◽  
Mechanical Metamaterials ◽  
Absorption Performance

scholarly journals Brief review of metamaterials and auxetic materials

2021 ◽  
Vol 31 ◽  
pp. 1-9
Author(s):  
Raluca Florentina NEGREA ◽  
Keyword(s):  
Energy Absorption ◽  
Mechanical Response ◽  
Deformation Pattern ◽  
Geometrical Shape ◽  
Variable Permeability ◽  
Base Materials ◽  
Mechanical Metamaterials ◽  
Auxetic Materials ◽  
Potential Applications ◽  
Absorption Performance

This paper aims to provide a comprehensive review on auxetic materials and structures, including various types of cellular auxetics, natural and artificial auxetics, metallic auxetics, multi-material and composite auxetics. A material engineered to have aproperty that is not found in naturally occurring materials is the metamaterial (meaning"beyond" from the Greek word μετά meta, and "material" from the Latin word materia) made from assemblies of multiple elements shaped from composite materials such as metals and plastics. They have exceptional properties, derive from their geometrical shape rather than directly from the behavior of the base materials, in terms of mechanical response, energy absorption and, heat transport performance.One of the most studied species of mechanical metamaterials is the auxetic materials, a type of mechanical metamaterial with a negative Poisson’s ratio (which shrink transversely under longitudinal compression and expand transversely under longitudinal tension). They consistof numerous hinge-like cells that are joined together. The cells have a re-entrant geometry, i.e. under pressure, they expand in lateral direction.Superior and unusual properties of auxetics are presented and some existing or potential applications are summarized. Accompanied by uncommon deformation pattern under compression and tension, auxetic materials and structures are endowed with many desirable material properties, such as superior shear resistance, indentation resistance, fracture resistance, synclastic behavior, variable permeability and better energy absorption performance.

Multi-objective design optimization of additively manufactured lattice structures for improved energy absorption performance

2021 ◽  
pp. 095440622199554
Author(s):  
Recep M Gorguluarslan
Keyword(s):  
Energy Absorption ◽  
Response Surfaces ◽  
Optimization Process ◽  
Truss Optimization ◽  
Size Optimization ◽  
Lattice Structures ◽  
Multi Objective ◽  
Lattice Design ◽  
Highly Nonlinear ◽  
Absorption Performance

This paper aims to improve the energy absorption performance of stiffness-optimized lattice structures by utilizing a multi-objective surrogate-based size optimization that considers the additive manufacturing (AM) constraints such as the minimum printable size. A truss optimization is first utilized at the unit cell level under static compressive loads for stiffness maximization and two optimized lattice configurations called the Face-Body Centered Cubic (FBCC) lattice and the Octet Cubic (OC) are obtained. A multi-objective size optimization process is then carried out to improve the energy absorption capabilities of those lattice designs using non-linear compression simulations with Nylon12 material to be fabricated by the Multi Jet Fusion (MJF) AM process. Thin plate spline (TPS) interpolation method is found to produce very high accuracy as the surrogate model to predict the highly nonlinear response surfaces of energy absorption objectives in the optimization. Compared to the lattice designs with uniform strut diameters, by using the optimization process, the maximum energy absorption efficiency ( EAEm) and the crush stress efficiency ( CSE) of the OC lattice design are further improved up to 33% and 37%, respectively. The FBCC lattice design is also found to have superior EAEm performance compared to the existing lattice types considered for fabricating by the MJF process in the literature.

Bending Behavior of Simply-Supported Sandwich Beams Subjected to Large Deflection

2018 ◽  
Vol 777 ◽  
pp. 569-574
Author(s):  
Zhong You Xie
Keyword(s):  
Energy Absorption ◽  
Large Deflection ◽  
Absorption Efficiency ◽  
Sandwich Beams ◽  
Element Simulation ◽  
Energy Absorption Efficiency ◽  
Load Carrying ◽  
Absorption Performance ◽  
Bending Behavior ◽  
The Moment

Due to thin skins and soft core, it is apt to local indentation inducing the concurrence of geometrical and material nonlinearity in sandwich structures. In the paper, finite element simulation is used to investigate the bending behavior of lightweight sandwich beams under large deflection. A modified formulation for the moment at mid-span section of sandwich beams under large deflection is presented, and energy absorption performance is assessed based on energy absorption efficiency. In addition, it is found that no local indentation arises initially, while later that increases gradually with loading displacement increasing. The height of the mid-span section as well as load-carrying capacity decreases significantly with local indentation depth increasing.

Computational Modeling and Energy Absorption Behavior of Thin-Walled Tubes with the Kresling Origami Pattern

2021 ◽  
Vol 62 (2) ◽  
pp. 71-81
Author(s):  
Jiaqiang Li ◽  
Yao Chen ◽  
Xiaodong Feng ◽  
Jian Feng ◽  
Pooya Sareh
Keyword(s):  
Energy Absorption ◽  
Material Properties ◽  
Rotation Angle ◽  
Programming Model ◽  
Mixed Integer ◽  
Element Analysis ◽  
Cross Sectional ◽  
Thin Walled Tube ◽  
Absorption Performance ◽  
Thin Walled

Origami structures have been widely used in various engineering fields due to their desirable properties such as geometric transformability and high specific energy absorption. Based on the Kresling origami pattern, this study proposes a type of thin-walled origami tube the structural configuration of which is found by a mixed-integer linear programming model. Using finite element analysis, a reasonable configuration of a thin-walled tube with the Kresling pattern is firstly analyzed. Then, the influences of different material properties, the rotation angle of the upper and lower sections of the tube unit, and cross-sectional shapes on the energy absorption behavior of the thin-walled tubes under axial compression are evaluated. The results show that the symmetric thin-walled tube with the Kresling pattern is a reasonable choice for energy absorption purposes. Compared with thin-walled prismatic tubes, the thin-walled tube with the Kresling pattern substantially reduces the initial peak force and the average crushing force, without significantly reducing its energy absorption capacity; moreover, it enters the plastic energy dissipation stage ahead of time, giving it a superior energy absorption performance. Besides, the material properties, rotation angle, and cross-sectional shape have considerable influences on its energy absorption performance. The results provide a basis for the application of the Kresling origami pattern in the design of thin-walled energy-absorbingstructures.

Dynamic crushing and energy absorption performance of newly designed multitubular structures

2020 ◽  
Vol 27 ◽  
pp. 1928-1933
Author(s):  
J. Nagarjun ◽  
A. Praveen Kumar ◽  
K. Yamini Reddy ◽  
L. Ponraj Sankar
Keyword(s):  
Energy Absorption ◽  
Absorption Performance ◽  
Dynamic Crushing

scholarly journals A Multi-Cell Hybrid Approach to Elevate the Energy Absorption of Micro-Lattice Materials

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4083
Author(s):  
Lijun Xiao ◽  
Xiao Xu ◽  
Weidong Song ◽  
Menglei Hu
Keyword(s):  
Energy Absorption ◽  
Cell Hybrid ◽  
Volume Fraction ◽  
Hybrid Approach ◽  
Symmetric Distribution ◽  
Soft Matrix ◽  
Plastic Energy ◽  
Bcc Lattice ◽  
Lattice Materials ◽  
Absorption Performance

Multi-cell hybrid micro-lattice materials, in which the stretching dominated octet cells were adopted as the strengthen phase while the bending dominated body centered cubic (BCC) lattice was chosen as the soft matrix, were proposed to achieve superior mechanical properties and energy absorption performance. Both stochastic and symmetric distribution of octet cells in the BCC lattice were considered. The cell assembly micromechanics finite element model (FEM) was built and validated by the experimental results. Accordingly, virtual tests were conducted to reveal the stress–strain relationship and deformation patterns of the hybrid lattice specimens. Meanwhile, the influence of reinforcement volume fraction and strut material on the energy absorption ability of the specimens was analyzed. It was concluded that the reinforced octet cells could be adopted to elevate the elastic modulus and collapse strength of the pure BCC micro-lattice material. The multi-cell design could lead to strain hardening in the plateau stress region which resulted in higher plateau stresses and energy absorption capacities. Besides, the symmetric distribution of reinforcements would cause significant stress fluctuations in the plateau region. The obtained results demonstrated that the multi-cell hybrid lattice architectures could be applied to tailor the mechanical behavior and plastic energy absorption performance of micro-lattice materials.

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