Review
Engineering, Civil
Rafael Augusto Gomes, Lucas Antonio de Oliveira, Matheus Brendon Francisco, Guilherme Ferreira Gomes
Summary: This paper summarizes the definitions, designs, analyses, optimizations, mechanical properties, and specific applications of various auxetic tubular structures. It highlights the importance of additive manufacturing and numerical analysis in manufacturing and analyzing these structures. The purpose of this paper is to provide researchers and engineers with a step-by-step methodology for developing and applying auxetic tubular structures.
THIN-WALLED STRUCTURES
(2023)
Article
Computer Science, Interdisciplinary Applications
Qiang Gao, Wei-Hsin Liao, Liangmo Wang, Chen Huang
Summary: A novel structure is proposed to enhance energy absorption by introducing thin-walled tube as the inner liner tube in cylindrical structures with negative Poisson's ratio (C-NPR). Parametric analysis and optimization techniques improve crashworthiness performance, increasing specific energy absorption to 10.26 kJ/kg.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2021)
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
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
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
Materials Science, Multidisciplinary
Yichao Xu, Yezeng Huang, Hao Yan, Zhandong Gu, Tianyi Zhao, Rong Zhang, Bing Pan, Leiting Dong, Mingjie Liu, Lei Jiang
Summary: The sunflower stem pith is a natural material with superior mechanical properties that provides strong lodging resistance and high energy absorption efficiency. It exploits anisotropic auxeticity to adapt to changing environments, and the dual-gradient structure of sunflower pith is responsible for its anisotropic auxeticity.
Article
Construction & Building Technology
Ru Zhong, Xin Ren, Xiang Yu Zhang, Chen Luo, Yi Zhang, Yi Min Xie
Summary: Auxetic materials and honeycomb sandwich structures exhibit desirable mechanical properties, and a novel concrete composite with auxetic layered honeycomb has been designed and investigated for exploring their load-bearing performance. The results show that the layered structure has higher initial peak stress, stable platform stress, improved shear resistance, and overall stability.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Physical
Julian Plewa, Malgorzata Plonska, Kamil Feliksik
Summary: This paper introduces a type of structures called auxetic tubular structures, which have a negative Poisson's ratio and great potential for various applications. The tubular structures are realized by rolling up planar structures and using rigid square frames as unit cells. Changes in linear dimensions are achieved through a hinge mechanism, and an innovative connection solution is used to connect the square frames.
Article
Engineering, Mechanical
Maryam Morvaridi, Giorgio Carta, Federico Bosia, Antonio S. Gliozzi, Nicola M. Pugno, Diego Misseroni, Michele Brun
Summary: A novel two-dimensional hierarchical auxetic structure is proposed, utilizing interactions between different scale cuts to achieve a Poisson's ratio close to the minimum limit. Experimental validation on a polymeric specimen demonstrates the effectiveness of the structure, which shows potential for various engineering applications.
EXTREME MECHANICS LETTERS
(2021)
Article
Acoustics
Jagannath Debasis Parhi, Tarapada Roy
Summary: This study investigates the nonlinear vibration behaviors of carbon nanotube reinforced composite structures with negative Poisson's ratio. Mathematical models are used to analyze the vibrations, revealing that the amplitude of transverse force of excitation is a key parameter influencing the nonlinear dynamics.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Instruments & Instrumentation
Suleyman Nazif Orhan, Seydanur Erden
Summary: This paper presents a comparative numerical study of different 2D and 3D auxetic structures, and investigates the characteristics and mechanical properties of elliptic holes and lozenge grids in the 3D case. The findings show that the elliptical holes structure exhibits a higher negative Poisson's ratio and the 3D re-entrant and 2D arrowhead structures outperform the other auxetics in terms of Young's modulus and stiffness values.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Chemistry, Multidisciplinary
Shahram Yalameha, Zahra Nourbakhsh, Ali Ramazani, Daryoosh Vashaee
Summary: Using first-principles calculations, highly stable cubic bialkali bismuthides Cs(Na, K)(2)Bi with important mechanical and anisotropic elastic properties were predicted. Mechanical properties under different pressures were investigated, showing varying behaviors and properties for different compounds. The study highlights the tunable nature of these compounds under pressure and offers insights into designing high-performance nanoscale electromechanical devices.
Article
Mechanics
Ying Gao, Xingyu Wei, Xingkai Han, Zhengong Zhou, Jian Xiong
Summary: This paper introduces a new methodology for generating 3D lattice structures with negative Poisson's ratio behavior and systematically investigates the elastic properties of these structures, finding that the homogenized Poisson's ratio effect can be tuned in a wide range along different principal axes. The design flexibility of these structures would help to expand and accelerate their adoption in engineering applications.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Amir Asadi, Dorna Hedayat, Sadegh Ghofrani, Ali Abouei Mehrizi, Ghasem Shadalooyi, Javad Kadkhodapour, Ali Pourkamali Anaraki
Summary: In this study, three stents with negative Poisson's ratio were designed by improving the unit cell structure, and numerical and experimental investigations were conducted using different materials. The modified auxetic stents showed better auxeticity and Poisson's ratio, and had higher radial expansion, stress tolerance and yield strain, which helped to overcome the drawbacks of non-auxetic stents.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
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
Biophysics
Mariam Mir, Umar Ansari, Murtaza Najabat Ali
JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS
(2017)
Review
Engineering, Biomedical
T. Jamil, U. Ansari, M. Najabat Ali, M. Mir
Article
Biophysics
Faiza Bukhari, Umar Ansari, Murtaza Najabat Ali, Hafsah Akhtar, Sarim Asif, Umer Mohammad, Mariam Mir
JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS
(2017)
Article
Engineering, Biomedical
Mariam Mir, Umar Ansari, Murtaza Najabat Ali, Muhammad Hassan Ul Iftikhar, Faisal Qayyum
IEEE JOURNAL OF TRANSLATIONAL ENGINEERING IN HEALTH AND MEDICINE
(2017)
Review
Pharmacology & Pharmacy
Bakhtawar Ghafoor, Amna Aleem, Murtaza Najabat Ali, Mariam Mir
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
(2018)
Article
Instruments & Instrumentation
Mariam Mir, Murtaza Najabat Ali, Umar Ansari, Patrick J. Smith, Amber Zahoor, Faisal Qayyum, Sabtain Abbas
Article
Cardiac & Cardiovascular Systems
Murtaza Najabat Ali, Mariam Mir, Piotr Buszman
Summary: The study demonstrated two cases of binary restenosis with REJUVENATE (R) at short and mid-term follow-up, but the stenosed area decreased to 21% at long-term follow-up. Histopathology analysis showed lower levels of inflammation and complete endothelialization at 180 days, supporting the safety of REJUVENATE (R) stent.
PAKISTAN HEART JOURNAL
(2021)
Article
Multidisciplinary Sciences
Sadia Hassan, Murtaza Najabat Ali, Mariam Mir, Ammad Ahmed, Munam Arshad
Summary: In this study, an electromechanically actuated drug dispensation device was developed and evaluated for controlled release of active pharmaceutical compound. Additive manufacturing was used to design and fabricate the device, with haptic technology providing stimulation for drug release. The effectiveness and personalized medication outcome of the device were demonstrated through in vitro, microbial, and in vivo studies.
SN APPLIED SCIENCES
(2021)
Article
Cardiac & Cardiovascular Systems
Azhar Mahmood Kayani, Syed Nadeem Hassan Rizvi, Khusrow A. Niazi, Murtaza Najabat Ali, Muhammad Mubashar Aslam, Mariam Mir, Haris Ali
Summary: The pilot study aimed to evaluate the safety, feasibility, deliverability, and efficiency of the newly developed REJUVENATE (R) bare metal stent system in coronary artery disease patients in Pakistan. The study showed good deliverability and clinical safety of the stent system over a 10-month period, with no observed cases of in-stent restenosis or stent thrombosis.
PAKISTAN HEART JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Sadia Hassan, Murtaza Najabat Ali, Mariam Mir
Summary: The annealing temperature of cobalt-based alloys affects carbide precipitation, grain boundary formation, and crystallinity. In this study, the surface characteristics, corrosion potential, and biocompatibility of a stent containing carbon-rich particles were compared to a commercially available stent without carbon precipitates. The results showed that both stents had similar surface features, corrosion potentials, and biocompatibility.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Instruments & Instrumentation
Aniqa Junaid, Murtaza Najabat Ali, Mariam Mir, Sadia Hassan
Summary: This study presents the synthesis of a hydrogel composed of Chitosan and Poly(ethylene glycol) and investigates its thermal responsive behavior. The experimental results show that this hydrogel has the potential to be used as a temperature sensor in medical applications.
Article
Cardiac & Cardiovascular Systems
Piotr Buzsman, Murtaza Najabat Ali, Mariam Mir, Haris Ali, Muhammad Mubashar Aslam, Sadia Hassan, Azhar Mahmood Kayani
Summary: This study evaluated the vascular and tissue response of a Pakistani manufactured novel drug eluting stent on a swine model, comparing the results with a control stent. The novel stent performed comparably or better than the control stent at different follow-up time points, indicating its potential feasibility for clinical use after necessary clinical trials.
PAKISTAN HEART JOURNAL
(2022)
Article
Cardiac & Cardiovascular Systems
Muhammad Umer, Murtaza Najabat Ali, Aamir Mubashar, Mariam Mir
RESEARCH REPORTS IN CLINICAL CARDIOLOGY
(2019)
Article
Radiology, Nuclear Medicine & Medical Imaging
Mariam Mir, Murtaza Najabat Ali, Ambar Zahoor, Patrick J. Smith
BIOMEDICAL PHYSICS & ENGINEERING EXPRESS
(2018)
Review
Engineering, Biomedical
Mariam Mir, Murtaza Najabat Ali, Afifa Barakullah, Ayesha Gulzar, Munam Arshad, Shizza Fatima, Maliha Asad
PROGRESS IN BIOMATERIALS
(2018)