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Article
Materials Science, Multidisciplinary
Ramin Hamzehei et al.
Summary: This article proposes a novel bioinspired friction-based mechanical metamaterial, inspired by parrot's beaks, that exhibits a zero Poisson's ratio behavior. The mechanical performances of the metamaterials are studied at both macro and micro scales through experiments and finite element analysis, demonstrating their energy absorption and dissipation features.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Engineering, Mechanical
S. Choukir et al.
Summary: This study compares the topology-fracture toughness relationship of sheet-based, strut-based, and plate-based lattice topologies in periodic cellular materials. The simulations show that sheet lattices have the highest toughness at higher densities, but their performance deteriorates faster at lower densities compared to strut lattices. For low-density regimes, TPMS sheet-based topologies offer a better alternative with near-linear scaling of fracture toughness with density. Additionally, the crack propagation paths in 3D cellular structures depend on both fracture geometry and lattice topology.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Mechanics
Yi Pan et al.
Summary: A cylindrical negative stiffness structure with inner hollow parts filled by inclined beam elements is proposed in this paper, which can achieve enhanced stiffness and energy absorption by improving space utilization. The quasi-static and dynamic mechanical properties of the structure were studied through theoretical analysis, numerical simulation, and experimental validation. Finally, the structure was applied as a cushion in a non-pyrotechnic separator, demonstrating good cushion performance. This work is expected to provide more potential for the applications of cylindrical negative stiffness structures.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Mechanics
J. S. Hu et al.
Summary: A general model is established to evaluate the interfacial thermal damage and predict the fatigue life of the auxetic honeycomb-substrate structure (H-SS). The transient temperature field and thermal stresses are determined using the finite difference method. The interfacial thermal stress intensity factor is used to characterize stress concentration behavior, and based on this, the interfacial thermal damage evolution and fatigue life prediction of the structure are made. The results show that the auxetic property significantly enhances the fatigue life of the structure, and neglecting the effect of temperature-dependent material properties (TDMPs) undervalues the fatigue life. The influence of TDMPs on the fatigue life increases with the absolute value of the internal cell angle. This study provides a comprehensive assessment of thermal damage and fatigue life in auxetic H-SSs and serves as a theoretical foundation for future applications in extreme temperature environments.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Benjamin C. White et al.
Summary: As 3D printing technology advances, the accessibility of structural lattice metamaterials increases, requiring a better understanding of their fracture behavior. Interpenetrating lattices, created by weaving physically separate lattices together, offer a promising way to enhance fracture toughness by increasing the fracture process zone size and introducing unique toughening mechanisms. These lattices display a rising resistance-curve behavior, with significantly higher toughness than the initiation toughness needed to start a crack. In certain topologies, the toughness of interpenetrating lattices can be five times greater than that of their corresponding solid base material, and the toughening effect can be customized by controlling the mechanical mismatch of the constituent sub-lattices.
Article
Chemistry, Physical
Angkur Jyoti Dipanka Shaikeea et al.
Summary: Research shows that traditional elastic fracture mechanics and fracture testing methods are insufficient to characterize the fracture properties of advanced ultralight mechanical metamaterials. By combining numerical and asymptotic analysis, the study extends the concepts of elastic fracture mechanics to develop a general test and design protocol for truss-based metamaterials. This new framework provides a basis for understanding fracture in other elastic-brittle solids where traditional notions of fracture toughness may not apply.
Article
Instruments & Instrumentation
Ramin Hamzehei et al.
Summary: This study introduces a novel type of two-dimensional graded metamaterials with zero Poisson's ratio for energy absorption applications. Inspired by the 2D image of a DNA molecule, these metamaterials are designed with re-entrant unit cells that result in a zero Poisson's ratio behavior. The energy absorption capacity of the metamaterials is enhanced by incorporating slots and horizontal beams, taking inspiration from the DNA molecule's base pairs.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Xin Shu et al.
Summary: Inspired by microstructures in architected composites, this study proposes the concept of enhancing the toughness of uniform honeycomb (UH) structures through heterogeneous design, specifically by varying the struts thickness. Experimental and theoretical investigations on hexagonal lattices with heterogeneous design reveal that the choice of reinforcement phase influences the toughness and deformation mechanisms. The results provide insights into the structure-property relationship and facilitate the design and usage of lattice structures in structural engineering applications.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Igor Zhilyaev et al.
Summary: This study proposes the use of metamaterials principles and machine-learning techniques to design artificial flexible wing patterns, and demonstrates their practical advantages in enhancing lift.
MATERIALS & DESIGN
(2022)
Article
Instruments & Instrumentation
Chunyu Zhao et al.
Summary: A macroscopic double-network (DN) design for a stretchable composite is proposed, which embeds strain-rate stiffening elastomer (SSE) reinforced bars into an Ecoflex matrix. The Ecoflex/SSE composite shows higher toughness and fatigue threshold compared to traditional single-network elastomers due to the complementarity of mechanical properties between Ecoflex and SSE, as well as the strong interfacial bond strength. Moreover, the fracture toughness of the Ecoflex/SSE composite is enhanced with increasing external strain rates, and a sideway crack-arrest morphology is observed above 0.1 s(-1), indicating better anti-crack ability at higher strain rates.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Green & Sustainable Science & Technology
Ali Zolfagharian et al.
Summary: This paper introduces a novel zero Poisson's ratio graded cylindrical metamaterial that achieves vibration isolation performance before resonance and global buckling control of long cylindrical tubes using multi-stiffness re-entrant unit cells.
Article
Materials Science, Multidisciplinary
Shengzhi Luan et al.
Summary: This study investigates the fracture properties of regular triangular and hexagonal lattices using numerical simulations and tensile tests to compare their crack orientations, displacements, and energy release rates. The results indicate that the triangular lattice has significantly higher toughness than the hexagonal honeycomb structure.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Ramin Hamzehei et al.
Summary: This article introduces novel 3D zero Poisson's ratio (ZPR) metamaterials for reversible energy absorption applications fabricated by 4D printing technology. The designs are based on piecemeal energy absorption (PEA) and conventional energy absorption (CEA) approaches. Finite element analysis and experimental testing are used to validate the accuracy and performance of the designs. The article also demonstrates the shape recovery capability of the metamaterials through a thermal test.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Alessandro Ciallella et al.
Summary: In this paper, a generalized two-field model for pantographic sheets is proposed to describe the mechanical behavior of the sheets, including cyclic extension tests in elastic regimes and damage initiation. Experimental tests were performed to validate the model, and the observed rupture and dissipation mechanisms were attributed to the shear deformation of the interconnecting pivots.
MATHEMATICS AND MECHANICS OF SOLIDS
(2022)
Article
Engineering, Mechanical
Marco Maurizi et al.
Summary: Nano-architected lattices, a novel class of mechanical metamaterials, demonstrate unprecedented mechanical properties by exploiting small scale material effects and structural topology. However, the understanding of fracture characteristics and properties of these 3D nano-architected lattices still hinders the design and realization of future engineering applications.
EXTREME MECHANICS LETTERS
(2022)
Article
Engineering, Mechanical
Sage Fulco et al.
Summary: We investigate the elastic-plastic fracture of architected materials and find that load sharing and toughness can be controlled by changing the spatial distribution and height of pillars. We present a simple relation to relate the plastic fracture process zone to the pillar array structure and toughness. This relation allows for quantitative prediction of failure loads and reveals that strength and toughness can be decoupled through architecture, providing a foundation for the design of architected materials with enhanced fracture toughness.
EXTREME MECHANICS LETTERS
(2022)
Article
Mechanics
Philipp E. Seiler et al.
Summary: Recent research focuses on the impact of strut shape on the tensile response of 2D lattices made from low-carbon steel sheets. Experiment measurements and FE calculations show that strut waviness can enhance ductility, especially for bending-dominated hexagonal lattices. Manufacturing imperfections such as undercuts have a small effect on ductility but significantly reduce the ultimate tensile strength.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Mechanical
K. Li et al.
Summary: A local reinforcement technique is proposed to enhance the macroscopic strength and ductility of lattices near stress-raising features like notches, with optimized lattice structures determined based on the sensitivity of macroscopic tensile response to strut waviness distribution. Both hexagonal and triangular lattice structures were studied, representing bending-dominated and stretching-dominated lattices respectively.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Nanoscience & Nanotechnology
Saeed Rezaei et al.
Summary: The paper utilized the modified SIMP topology optimization method to investigate the impact of diverse auxetic unit cells with different volume fractions on 2D auxetic structures composed of symmetric, chiral and re-entrant unit cells. 3D printed auxetic structures were compression tested to validate the TO results.
PHOTONICS AND NANOSTRUCTURES-FUNDAMENTALS AND APPLICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Meng-Ting Hsieh et al.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2020)
Article
Materials Science, Multidisciplinary
Ramin Hamzehei et al.
MECHANICS OF MATERIALS
(2020)
Article
Mechanics
Ivan Giorgio et al.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2020)
Article
Mechanics
Huaiyuan Gu et al.
ENGINEERING FRACTURE MECHANICS
(2019)
Article
Engineering, Mechanical
Riccardo Manno et al.
EXTREME MECHANICS LETTERS
(2019)
Article
Engineering, Mechanical
Ramin Hamzehei et al.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2018)
Article
Mechanics
Huaiyuan Gu et al.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2018)
Article
Materials Science, Multidisciplinary
Eesha Khare et al.
FRONTIERS IN MATERIALS
(2018)
Article
Mechanics
M. Spagnuolo et al.
MECHANICS RESEARCH COMMUNICATIONS
(2017)