Design of buckling-induced mechanical metamaterials for energy absorption using topology optimization

2018 ◽  
Vol 58 (4) ◽  
pp. 1395-1410 ◽  
Author(s):  
Qi Chen ◽  
Xianmin Zhang ◽  
Benliang Zhu
Keyword(s):  
Topology Optimization ◽  
Energy Absorption ◽  
Mechanical Metamaterials

Evolutionary topology optimization for mechanical metamaterials with auxetic property

2020 ◽  
Vol 179 ◽  
pp. 105638 ◽  
Author(s):  
Yongfeng Zheng ◽  
Yingjun Wang ◽  
Xiang Lu ◽  
Zhongyuan Liao ◽  
Jinping Qu
Keyword(s):  
Topology Optimization ◽  
Mechanical Metamaterials

Topology Optimization of Cellular Materials With Maximized Energy Absorption

2015 ◽  
Author(s):  
Josephine V. Carstensen ◽  
Reza Lotfi ◽  
James K. Guest ◽  
Wen Chen ◽  
Jan Schroers
Keyword(s):  
Topology Optimization ◽  
Mathematical Programming ◽  
Energy Absorption ◽  
High Performance ◽  
Optimization Problem ◽  
Cellular Materials ◽  
Component Level ◽  
Linear Elastic ◽  
Optimization Formulation ◽  
Level Scale

While topology optimization is typically employed for design at the component-level scale, it is increasingly being used to design the topology of high performance cellular materials. The design problem is posed as an optimization problem with governing unit cell and upscaling mechanics embedded in the formulation, and solved with formal mathematical programming. While design for linear elastic properties is generally well-established, this paper will discuss including nonlinear mechanics in the topology optimization formulation, also in the domain of cellular materials. In particular, the problem of maximizing total energy absorption of a cellular Bulk Metallic Glass material is considered and numerical and experimental analyses of the new design show that it has enhanced performance compared to conventional cellular topologies.

scholarly journals Optimization Simulation of the Light Aircraft’s Cockpit Made of Carbon Fiber Reinforced Composites

2017 ◽  
Author(s):  
Pu-Woei Chen ◽  
Chia-Hung Liu
Keyword(s):  
Aluminum Alloy ◽  
Topology Optimization ◽  
Carbon Fiber ◽  
Energy Absorption ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Composites ◽  
Carbon Fiber Reinforced ◽  
The Impact

Due to the demands of personal travels and entertainments, light airplanes and small business aircrafts are developing rapidly. Light airplane structure is simple; however, it lacks crashworthiness design, especially the considerations on the impact of energy absorption. Therefore, in an event of accident, significant damage to passengers will be usually incurred. Airplanes made of composite materials structurally have high specific strength and good aerodynamic configuration. These materials have become the primary choice for new airplane development. This study mainly explores the topology optimization analysis of the light aircraft’s cockpit made of carbon fiber reinforced composites. This paper compares the compression amounts in the original models of composite material and aluminum alloy fuselages with the models after optimization during the crash-landing, in order to investigate the safety of fuselages made of different materials after structural optimization under the dynamic crashing. This study found that the energy absorbed by the aluminum alloy fuselage during crash-landing is still higher than that by the carbon fiber reinforced composites fuselage. On the other hand, the aluminum alloy fuselage after topology optimization could have an energy absorption capability enhanced by 40%, as compared to the that of the original model of aluminum alloy fuselage.

scholarly journals Robust topological designs for extreme metamaterial micro-structures

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tanmoy Chatterjee ◽  
Souvik Chakraborty ◽  
Somdatta Goswami ◽  
Sondipon Adhikari ◽  
Michael I. Friswell
Keyword(s):  
Mechanical Properties ◽  
Topology Optimization ◽  
Elastic Modulus ◽  
Robust Design ◽  
Poisson’S Ratio ◽  
Mechanical Performance ◽  
Poisson's Ratio ◽  
Mechanical Metamaterials ◽  
Homogenization Approach ◽  
Micro Structures

AbstractWe demonstrate that the consideration of material uncertainty can dramatically impact the optimal topological micro-structural configuration of mechanical metamaterials. The robust optimization problem is formulated in such a way that it facilitates the emergence of extreme mechanical properties of metamaterials. The algorithm is based on the bi-directional evolutionary topology optimization and energy-based homogenization approach. To simulate additive manufacturing uncertainty, combinations of spatial variation of the elastic modulus and/or, parametric variation of the Poisson’s ratio at the unit cell level are considered. Computationally parallel Monte Carlo simulations are performed to quantify the effect of input material uncertainty to the mechanical properties of interest. Results are shown for four configurations of extreme mechanical properties: (1) maximum bulk modulus (2) maximum shear modulus (3) minimum negative Poisson’s ratio (auxetic metamaterial) and (4) maximum equivalent elastic modulus. The study illustrates the importance of considering uncertainty for topology optimization of metamaterials with extreme mechanical performance. The results reveal that robust design leads to improvement in terms of (1) optimal mean performance (2) least sensitive design, and (3) elastic properties of the metamaterials compared to the corresponding deterministic design. Many interesting topological patterns have been obtained for guiding the extreme material robust design.

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.

Mechanical design and energy absorption performances of novel dual scale hybrid plate-lattice mechanical metamaterials

2020 ◽  
Vol 40 ◽  
pp. 100918
Author(s):  
Rui Xue ◽  
Xinguang Cui ◽  
Peng Zhang ◽  
Kai Liu ◽  
Ying Li ◽  
...  
Keyword(s):  
Energy Absorption ◽  
Mechanical Design ◽  
Mechanical Metamaterials ◽  
Hybrid Plate ◽  
Dual Scale

scholarly journals A Novel Design Method for Energy Absorption Property of Chiral Mechanical Metamaterials

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5386
Author(s):  
Mengli Ye ◽  
Liang Gao ◽  
Fuyu Wang ◽  
Hao Li
Keyword(s):  
Energy Absorption ◽  
Large Deviation ◽  
Design Method ◽  
Structural Parameters ◽  
Impact Resistance ◽  
Absorption Properties ◽  
Impact Compression ◽  
Mechanical Metamaterials ◽  
Good Energy ◽  
Bragg Grating Sensor

In this paper, a full-cycle interactive progressive (FIP) method that integrates topology optimization, parametric optimization, and experimental analysis to determine the optimal energy absorption properties in the design of chiral mechanical metamaterials is proposed. The FIP method has improved ability and efficiency compared with traditional design methods due to strengthening the overall design, introducing surrogate models, and its consideration of the application conditions. Here, the FIP design was applied in the design of mechanical metamaterials with optimized energy absorption properties, and a chiral mechanical metamaterial with good energy absorption and impact resistance was obtained based on the rotation mechanism of metamaterials with a negative Poisson’s ratio. The relationship among the size parameters, applied boundary conditions, and energy absorption properties were studied. An impact compression experiment using a self-made Fiber Bragg Grating sensor was carried out on the chiral mechanical metamaterial. In light of the large deviation of the experimental and simulation data, a feedback adjustment was carried out by adjusting the structural parameters to further improve the mechanical properties of the chiral mechanical metamaterial. Finally, human–computer interaction, self-innovation, and a breakthrough in the design limits of the optimized model were achieved. The results illustrate the effectiveness of the FIP design method in improving the energy absorption properties in the design of chiral mechanical metamaterials.

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