Article
Materials Science, Multidisciplinary
Yingying Xue, Qi Shao, Jianhui Mu, Xun Ji, Xingfu Wang
Summary: Compared with 2D auxetic metamaterials, 3D auxetic metamaterials exhibit better structural, mechanical, and functional properties, making them more suitable for various engineering applications. In this study, three types of 3D star-shaped auxetic structures with small unit cell were proposed and fabricated using selective laser melting method. The compressive behavior and energy absorption of these structures were investigated and compared using finite-element method (FEM) and experimental results.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
Article
Chemistry, Physical
Julian Plewa, Malgorzata Plonska, Pawel Lis
Summary: This paper introduces a failsafe mode in structures made of rigid squares, which exhibit a unique expansion laterally instead of contraction upon stretching. A novel solution for connecting the squares is proposed by introducing axes of rotation on the square's surface. Physical models confirm the theoretical relationships and offer new application possibilities.
Article
Materials Science, Multidisciplinary
Kazi Zahir Uddin, Nicholas Pagliocca, Ibnaj Anamika Anni, George Youssef, Behrad Koohbor
Summary: This study investigates the relationships between global and local strain fields in rectangular center-symmetric perforated planar structures, highlighting the role of local morphology on the macroscopic material response.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Xiaoyang Zheng, Ta-Te Chen, Xiaofeng Guo, Sadaki Samitsu, Ikumu Watanabe
Summary: Mechanical metamaterials with negative Poisson's ratios, such as auxetic metamaterials, exhibit counterintuitive behaviors. An inverse design method using deep learning was proposed to generate auxetic metamaterials with user-defined properties. The method was demonstrated to accelerate the design and development of mechanical metamaterials through finite element simulations and mechanical property tests.
MATERIALS & DESIGN
(2021)
Article
Engineering, Mechanical
Jipeng Cui, Liangchi Zhang, Asit Kumar Gain
Summary: This study proposes a novel unit cell design for 3D metamaterials with negative Poisson's ratios (NPR) and establishes theoretical formulas to predict the NPR. Some 3D metamaterials were fabricated using additive manufacturing technique, and their properties were tested experimentally and numerically against the theoretical predictions. The results show that the new unit cell design and theoretical formulas effectively realize the design of 3D-NPR metamaterials with predictable properties for practical applications.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
V Harinarayana, Y. C. Shin
Summary: In this study, a comprehensive design and fabrication of a three-dimensional axisymmetric auxetic structure that exhibits uniform and axisymmetric transverse deformation under longitudinal compression loading is proposed. The design of the metamaterial is generated by revolving a two-dimensional parabolic curve along the axis of rotation and subsequently perforating the structure periodically with elliptical voids. The significance of the perforations is elucidated by comparing the metamaterial structure to a plain structure.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Multidisciplinary
Kai Wang, Feng Wan, Ling Luo, Pengyu Cao, Lei Han, Peng Jin
Summary: This paper investigates the buckling enhancement of the negative Poisson's ratio (NPR) effect on a laminated plate under uniaxial compression with an in-plane translational restraint. By studying the buckling equation and lamination parameters, it is found that the critical buckling load of an NPR-laminated composite can be increased due to the induced tension force on the unloaded direction under compression. The Poisson's ratio contours and buckling load enhancement are analyzed, and the inverse problem of deciding the laminate configuration is solved using the particle swarm optimization (PSO) algorithm.
APPLIED SCIENCES-BASEL
(2023)
Article
Instruments & Instrumentation
Tatheer Zahra
Summary: A study on 3D printing of auxetic materials revealed that specimens with the smallest cell sizes exhibited the highest resistance against compression, tension, and out-of-plane loading, as well as higher elastic modulus and negative Poisson's ratio. Larger cell geometries showed higher deformability and energy absorption characteristics, while all designed geometries exhibited similar deformability in out-of-plane bending, with smaller cells demonstrating the maximum ductility.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Szymon Winczewski, Jaroslaw Rybicki
Summary: A novel class of two-dimensional auxetic structures based on the pentagon motif, named as double re-entrant honeycomb, is proposed to exhibit complete and perfect auxeticity with a negative Poisson's ratio in both tensile and compressive regimes. It is shown that the considered structures simultaneously implement three different mechanisms leading to a negative Poisson's ratio.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Mingzhe Wang, Hongzhi Wu, Lei Yang, Annan Chen, Peng Chen, Haoze Wang, Zhiyuan Chen, Chunze Yan
Summary: In this study, a tunable metamaterial with negative Poisson's ratio is designed and fabricated, and its properties are verified through experiments and simulations. The results show that structures with different geometric features exhibit different auxetic effects, which can be designed by adjusting the angle of the structures. Additionally, three-dimensional auxetic structures are designed by the periodic distribution of two-dimensional structures, and the Poisson's ratio can be adjusted by changing the geometric parameters of the three-dimensional structures.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Electrical & Electronic
Weihua Gao, Jiantao Yao, Kunming Zhu, Pengwei Zhao, Xinbo Chen
Summary: This research proposes an innovative mechanical structure method by embedding a PDMS elastomer with negative Poisson's ratio (NPR) in a graphene-silicon rubber foam composite (rGO-PDMS/SR), which effectively improves the mechanical performance and resistance variation range for interactive information monitoring of multiple parts of the human body. The experimental results show that the rGO-PDMS/SR has expanded resistance variation range by six times compared to ordinary graphene-silicon rubber composites (rGO-SR), with high linear sensitivities and reliable stability during cyclic compression. Human interaction experiments demonstrate its good performance in signal detection for facial expression judgment, motion state monitoring, and other fields.
IEEE SENSORS JOURNAL
(2023)
Review
Materials Science, Multidisciplinary
P. Madhu Balan, A. Johnney Mertens, M. V. A. Raju Bahubalendruni
Summary: The continuous advancement of multifunctional materials is reshaping our way of life and paving the door for innovative things for us to probe the world and ourselves. Multifunctional Auxetic Mechanical Metamaterials (AMMs) have emerged in recent years, endowing them with innovative mechanical properties and multi functionalities, presenting a great way to transform numerous industries.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Engineering, Mechanical
Amit Rawal, Danvendra Singh, Ashish Rastogi, Sumit Sharma
Summary: This study explores the design principles and analytical methods for achieving negative Poisson's ratio in carbon nanotubes, employing energy minimization, structural modeling, and force-balance as means to target the desired outcome. The research highlights the significant role played by the alignment of carbon nanotubes in augmenting the magnitude of negative Poisson's ratio.
EXTREME MECHANICS LETTERS
(2021)
Article
Engineering, Manufacturing
Yuan Chen, Lin Ye
Summary: The research utilized 3D printing and carbon fiber reinforcement to enhance the mechanical properties and negative Poisson's ratio of base polymers. The results showed that the effective elastic modulus and compression strength of PA specimens can be linearly enhanced by adding carbon fibers. Additionally, a small amount of carbon fibers can significantly increase the negative Poisson's ratio of PA composite materials.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Chongxi Jiao, Gang Yan
Summary: This paper presents a novel 3D hexa-chiral helical structure design with negative Poisson's ratio, investigated its mechanical behaviors through experimental, theoretical, and numerical methods, and explored the relationship between geometric parameters and structural properties. The study used quasi-static compression tests and finite element simulation to analyze the relationship between geometric parameters and elastic mechanical properties, with good agreement between experimental and simulation results. The special coupled compression-torsion deformation mode and extension effect of the structure in a larger space were also discussed, providing insights for further optimizing geometric design for customized structural performance.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Textiles
Vishwas Mahesh, Vinyas Mahesh
Summary: This study aims to explore the potential application of rubber crumb in polymer matrix composites for structural purposes. The results show that the addition of rubber crumb can reduce water absorption and improve tensile, flexural, and impact strength. The VIKOR technique successfully identifies the optimum weight percentage of rubber crumb for the proposed composites.
JOURNAL OF NATURAL FIBERS
(2023)
Article
Materials Science, Composites
Vinyas Mahesh, Prasad G. Maladkar, Gangu S. S. Sadaram, Athul Joseph, Vishwas Mahesh, Dineshkumar Harursampath
Summary: Besides their anomalous behavior under tensile and compressive structures, auxetic structures have improved energy absorption characteristics that are highly desirable across different fields of study. This paper focuses on characterizing the compressive behavior and negative Poisson's ratio (NPR) of auxetic structures fabricated using additive manufacturing techniques and polymer nanocomposite materials. The study uses glycol-modified polyethylene terephthalate (PETG) and PETG nanocomposites filled with organically modified montmorillonite (OMMT) nanoclay particles to produce auxetic structures using fused filament fabrication (FFF). The compressive performance of different structures is evaluated through mechanical testing and digital image correlation (DIC), considering parameters such as crushing strength, NPR, and energy absorption. The results indicate that higher concentrations of nanoclay particles decrease the compressive strength and that NPR decreases with increasing strain rates. The study also highlights the influence of composition and structure geometry on the strain energy absorption. Aerospace applications can benefit from these high-performance material-structure combinations.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2023)
Article
Engineering, Multidisciplinary
Liming Zhou, Fangting Qu, Shuhui Ren, Vinyas Mahesh
Summary: In this paper, an inhomogeneous stabilized node-based smoothed radial point interpolation method (ISNS-RPIM) is proposed to analyze functionally graded magneto-electro-elastic (FGMEE) structures in hygrothermal environment. The method combines gradient smoothing technique (GST), coupling constitutive relationship, and takes into account the hygrothermo-magneto-electro-elastic (HMEE) coupling effects. Numerical examples are provided to validate the effectiveness and robustness of the proposed method. The results show that ISNS-RPIM has great potential in solving practical complex problems.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Mechanics
Hukum Chand Dewangan, Subrata Kumar Panda, Nitin Sharma, Samy Refahy Mahmoud, Dineshkumar Harursampath, Vinyas Mahesh
Summary: This work presents a numerical modeling study on the static large-deformation behavior of multilayered flat/curved panels with cutouts under thermo-mechanical load. The numerical model incorporates third order displacement polynomials and two nonlinear strains (Green-Lagrange and von-Karman) to capture the large-deformation characteristic of the panel. The governing equation is formulated using Hamilton's principle and solved using the selective integration scheme and Picard's direct iterative method.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Vinyas Mahesh
Summary: This research evaluates the combined effects of interphase and carbon nanotube agglomeration on the nonlinear deflection of a sandwich plate using an artificial neural network assisted finite-element approach. The data points collected from a developed computational tool are used to train the neural network model. The plate consists of agglomerated carbon nanotubes and three-phase magneto-electro-elastic composites. Different agglomeration states and carbon nanotube arrangements are considered, and interphase effects are incorporated through volume fractions and compositions. The numerical examples demonstrate the influence of coupling fields on the parameters.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS
(2023)
Article
Engineering, Civil
Duy-Khuong Ly, Vinyas Mahesh, Chanachai Thongchom, T. Nguyen-Thoi
Summary: This study proposes an advanced cell-based smoothed discrete shear gap method (CS-DSG3) using zig-zag theory integrated with a hybrid control mechanism for analysis of smart damping control of laminated functionally graded carbon nanotube reinforced composite (FG-CNTRC) shell structures. The study successfully combines CS-DSG3 with zig-zag theory to provide an effective global-local numerical approach for analyzing the behavior of laminated FG-CNTRC shell structures.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Kanav Chadha, Vinyas Mahesh, Arjun Siddharth Mangalasseri, Vishwas Mahesh
Summary: This article introduces a lightweight vibration-based energy harvester (EH) constituted of multifunctional magneto-electro-elastic (MEE) facesheets and auxetic metamaterial core (AMC). The use of the auxetic core enhances the EH's performance, resulting in an almost 1.5 times higher power output compared to conventional metal-based energy harvesters. The auxetic-based EH also achieves a 22% weight reduction for the same power output. This research contributes to the utilization of multifunctional composites and metamaterials in complex engineering applications.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
Vinyas Mahesh, Vishwas Mahesh, Sathiskumar Anusuya Ponnusami
Summary: In this article, the authors numerically investigate the damped nonlinear transient response of a smart sandwich plate subjected to the thermal environment. The study focuses on the synergistic influence of agglomeration, porosity, and pyro-coupling on vibration control. The results show significant effects of pyro-coupling on the active vibration control response of the sandwich plate.
Article
Mechanics
Vinyas Mahesh
Summary: This article proposes a hybrid method integrating finite element methods and artificial neural network models to predict the coupled nonlinear frequency response of porous functionally graded piezo-elasto-magnetic plates with non-uniform geometries. This approach significantly reduces computational efforts while maintaining considerable accuracy.
Article
Mechanics
Vinyas Mahesh
Summary: In this article, a novel finite element method - artificial neural network approach is used to study the coupled static parameters of a smart sandwich plate with agglomerated Carbon Nanotubes porous nanocomposite core and piezo-magneto-thermo-electric facings. The effects of CNTs agglomeration, porosity, and pyro-coupling of the PMTE materials are investigated. Data collected from a Finite Element computational tool are used to train the ANN model. Different agglomeration states and forms of porosity are considered for investigation. Numerical examples are solved to understand the interrelated effects of these material properties on the static parameters.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2023)
Article
Mechanics
Chetna Srivastava, Vinyas Mahesh, Pandi Pitchai, P. J. Guruprasad, Nik Petrinic, Fabrizio Scarpa, Dineshkumar Harursampath, Sathiskumar A. Ponnusami
Summary: The variational asymptotic method (VAM) is used to determine the equivalent elastic stiffness tensor of auxetic materials for the first time. The VAM allows rotational degrees-of-freedom of the structural elements without any assumptions. The homogenized response of the unit cells is fully anisotropic, with specific possible responses of orthotropy or transverse isotropy depending on the arrangement of structural elements. The predictions of the VAM-based method are validated using commercial finite element software and open literature, demonstrating its versatility and computational efficiency in describing auxetic metamaterials.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2023)
Article
Materials Science, Composites
Vishwas Mahesh, Vinyas Mahesh, Dineshkumar Harursampath
Summary: This study utilized Artificial Neural Network (ANN) strategies to evaluate the energy absorption capabilities of eco-friendly rubber crumb/kenaf composites under low-velocity impact loads. Experimental tests and ANN models were employed to predict the energy absorption behavior of these sustainable composites. The results showed that the composite's energy absorption capabilities were influenced by the ratio of rubber crumb to kenaf and the impact velocity.
POLYMER COMPOSITES
(2023)
Article
Engineering, Chemical
Surjeet Singh Bedi, Vasu Mallesha, Vinyas Mahesh, Vishwas Mahesh, Sriram Mukunda, Sushanth Negi, Sathiskumar Anusuya Ponnusami
Summary: The focus is on the influence of fillers in high-performance polymer composites and the utilization of additive manufacturing in this process. The thermal behavior of PETG polymers reinforced with graphene flakes was assessed, and it was found that increasing the concentration of graphene enhances the thermal properties of the composites. Chemical interactions between graphene and PETG also impact the overall effectiveness of the composites.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Engineering, Chemical
Vishwas Mahesh, Vinyas Mahesh, Dineshkumar Harursampath, Jayadev Shivanna, Rakesh Chikkathotlukere Lakshmikanth, Gagana Tumkur Renukumar, Babitha Channamuddenahalli Muthuramaiah
Summary: This study investigates the factors affecting the abrasion of cenosphere-reinforced syntactic foams and assesses their three-body wear behavior using Taguchi's design of experiments. The concentration of cenospheres, duration, and applied force all influence the wear rate of the syntactic foams.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Arjun Siddharth Mangalasseri, Vinyas Mahesh, Sriram Mukunda, Vishwas Mahesh, Sathiskumar A. Ponnusami, Dineshkumar Harursampath, Abdelouahed Tounsi
Summary: This article investigates the energy harvesting characteristics of a magneto-electro-elastic (MEE) cantilever beam reinforced with carbon nanotubes (CNT) under transverse vibration using a lumped parameter model. The influence of various factors on the energy harvesting behavior is thoroughly discussed, including the distribution and volume fraction of CNT, substrate material, and thickness ratios. The article aims to explore the behavior of smart materials reinforced with carbon nanotubes for energy harvesting applications.
ADVANCES IN NANO RESEARCH
(2023)