Graded lattice structures: Simultaneous enhancement in stiffness and energy absorption

Niknam, H.; Akbarzadeh, A.H.

doi:10.1016/j.matdes.2020.109129

Cited by 142 publications

(52 citation statements)

References 44 publications

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“…To evaluate the EA capacity of the superimposed lattice structure, it is necessary to consider the EA and specific EA (SEA) of the superimposed lattice structure. [ 24,29 ] The EA per unit volume is the area enclosed by the stress and strain curves, integrated within the strain range to obtain the EA of the superimposed structure of different diameters. The expression is

EA = \int_{0}^{ε_{0}} σ d ε

where σ and ε are the compressive stress and strain, respectively.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Characteristics of Superimposed 316L Lattice Structures under Static and Dynamic Loading

Chang

Zhang

et al. 2021

Adv Eng Mater

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Additive Manufacturing (AM) discrete patterns made of stainless steel 316 L offer potential energy absorption for engineering applications, including blast and impact protection systems and aircraft structure. Herein, three different superimposed stainless steel 316 L lattice structures varying rod diameter are manufactured by selective laser melting (SLM). Compression experiments and split Hopkinson pressure bar (SHPB) tests are conducted to determine the quasi‐static and impact behavior of different lattice structures for the strain rate from 10−3 to 1000 s−1. The compressive response, strain rate dependency, and energy absorption capacity of the lattice structures are mechanically characterized. In addition, numerical simulations are conducted to complement the experimental work in which the deformation modes of the lattice under mechanical responses have been studied. The results indicate that vertical truss in structure plays a bearing role in the whole process of compression, which is better than inclined truss structures. Due to the combined effect of two deformation modes in the superimposed structure, it has shown superior energy absorption capacity compared with other structures. The superiority of the superimposed structure provides a new idea for the design of lattice structure.

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EA = \int_{0}^{ε_{0}} σ d ε

where σ and ε are the compressive stress and strain, respectively.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Characteristics of Superimposed 316L Lattice Structures under Static and Dynamic Loading

Chang

Zhang

et al. 2021

Adv Eng Mater

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“…Compared with the lattice structure with uniform density, the properties of gradient lattice will change with the change of region due to the change of structural porosity [26]. Niknam et al [27] found that when the strain increases, the stiffness and energy absorption characteristics of the gradient lattice can exceed those of the lattice structure with uniform density distribution. Ajdari et al [28] introduced density gradient and compared the dynamic properties of lattice structures with different rules to develop a new shockproof structure.…”

Section: Latticementioning

confidence: 99%

Study on Vibration Damping Mechanism of Shoe Sole with Alternating Lattice Structure Using Vibration Level Difference

Wang

Yue

et al. 2021

Mathematical Problems in Engineering

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As one of the media of the ground and feet, the design of footwear products has lately received great attention, and the cushioning performance of the sole has become a key factor for the comfort and sportiness of the foot. In this paper, a new type of middle sole sports shoes with an alternating gradient lattice structure was proposed. The dynamic response of the structure was analyzed by ABAQUS software, and the model was validated by modal analysis. The effects of different kinds of alternating lattice and uniform lattice sole models on vibration isolation were analyzed by using the vibration level difference as the evaluation index of vibration characteristics. The analysis results are as follows: (a) We found that the mean of the vibration level difference of the alternating gradient structure is higher than that of the uniform lattice structure, which confirms the feasibility of the alternating gradient arrangement and its excellent buffering performance. (b) Two kinds of vibration stage drop values of the 24-series alternating lattice structure model are analyzed, and “C-G-X″ structure has the highest vibration stage drop value. In addition, the comprehensive analysis of the alternating gradient lattice structure of the soles shows that the four types of structures have good cushioning performance, and the C-series structure in the frequency range of 0–140 Hz vibration level difference value is higher than other series. The results show that the evaluation index of vibration level difference based on mechanical vibration characteristics can accurately analyze the response of different structure soles to vibration, which also provides a method for the future design of vibration reduction and exploration of the biomechanics of footwear.

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“…Advances in additive manufacturing have simplified the development of spatial structures and made it possible to develop more complex structures. Study [ 40 ] classifies different groups of lattices based on their topology and proposes a methodology to improve their energy absorption to weight ratio under compression. Particular attention was paid to the effect of changing the relative density in lattice structures printed with a 3D incremental stereolithography method.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research of Selected Lattice Structures Developed with 3D Printing Technology

et al. 2022

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This paper presents the results of the experimental research of 3D structures developed with an SLA additive technique using Durable Resin V2. The aim of this paper is to evaluate and compare the compression curves, deformation process and energy-absorption parameters of the topologies with different characteristics. The structures were subjected to a quasi-static axial compression test. Five different topologies of lattice structures were studied and compared. In the initial stage of the research, the geometric accuracy of the printed structures was analysed through measurement of the diameter of the beam elements at several selected locations. Compression curves and the stress history at the minimum cross-section of each topology were determined. Energy absorption parameters, including absorbed energy (AE) and specific absorbed energy (SAE), were calculated from the compression curves. Based on the analysis of the photographic material, the failure mode was analysed, and the efficiency of the topologies was compared.

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Graded lattice structures: Simultaneous enhancement in stiffness and energy absorption

Cited by 142 publications

References 44 publications

Mechanical Characteristics of Superimposed 316L Lattice Structures under Static and Dynamic Loading

Mechanical Characteristics of Superimposed 316L Lattice Structures under Static and Dynamic Loading

Study on Vibration Damping Mechanism of Shoe Sole with Alternating Lattice Structure Using Vibration Level Difference

Experimental Research of Selected Lattice Structures Developed with 3D Printing Technology

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