Article
Engineering, Mechanical
Xiang-Long Peng, Swantje Bargmann
Summary: The effective thermoelastic properties of three-dimensional lattice structures can be widely tunable by tailoring the microstructural geometry and constituent materials, exhibiting negative effective Poisson's ratios. If the walls have different thermal expansion coefficients, they can achieve isotropic negative or positive effective thermal expansion coefficients.
EXTREME MECHANICS LETTERS
(2021)
Article
Engineering, Mechanical
Kang-Jia Liu, Hai-Tao Liu, Jie Li
Summary: This paper proposes a bi-material triangle re-entrant honeycomb (BTRH) structure with tunable coefficient of thermal expansion (CTE), Poisson's ratio (PR), and bandgap. Analytical analysis and numerical simulations are used to quantify the changes in effective CTE, PR, and Young's modulus. Experiments are conducted to validate the theory of effective PR and Young's modulus. The band structures are calculated through finite element analysis, and the effects of geometric parameters and material combinations on mechanical properties are systematically investigated.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Oliver Skarsetz, Viacheslav Slesarenko, Andreas Walther
Summary: This study introduces shape morphing of a hydrogel metamaterial by integrating responsive actuating elements to reconfigure the mesoscale unit cell geometry, achieving programmable auxeticity. The ability to programmably change the unit cell angle from 68 degrees to 107 degrees results in negative, zero, or positive Poisson's ratio under tensile strain. Finite element simulation confirms the predicted geometrical reconfiguration and programmable auxeticity.
Article
Materials Science, Multidisciplinary
James N. Grima-Cornish, Daphne Attard, Kenneth E. Evans, Joseph N. Grima
Summary: This work investigates the potential of multi-material honeycombs to exhibit anomalous thermal expansion properties in specific directions, including negative thermal expansion (NTE) and zero thermal expansion (ZTE). It was found that re-entrant honeycombs can exhibit NTE in specific directions when made from positive thermal expansion (PTE) materials, and the conditions for honeycombs to demonstrate ZTE coefficients in specific directions were explored.
FRONTIERS IN MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Kang-Jia Liu, Hai-Tao Liu, Jie Li, Fu-Guang Ren
Summary: This study proposes a bi-material-directional honeycomb metamaterial (BHM) with tunable coefficient of thermal expansion (CTE) and bandgap properties. Theoretical analysis and numerical simulations reveal the thermal deformation mechanism of the BHM, as well as the analytical expression of the effective Young's modulus. Parameter analysis confirms that the CTE and bandgap of the BHM can be simultaneously regulated by changing the geometric parameters and material combinations.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Chemistry, Physical
Pawel Zajdel, Miroslaw Chorazewski, Juscelino B. Leao, Grethe Jensen, Markus Bleuel, Hai-Feng Zhang, Tong Feng, Dong Luo, Mian Li, Alexander Rowland Lowe, Monika Geppert-Rybczynska, Dan Li, Yaroslav Grosu
Summary: A study discovered a significant negative compressibility effect when a non-wetting liquid penetrates a flexible porous structure, causing expansion in certain dimensions. Through high-pressure neutron scattering, intrusion-extrusion experiments, and DFT calculations, coefficients of negative compressibility exceeding previously reported values by over an order of magnitude were achieved.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Yisong Bai, Chuanbao Liu, Yang Li, Jinxu Li, Lijie Qiao, Ji Zhou, Yang Bai
Summary: Mechanical metamaterials provide a feasible approach for achieving customized mechanical and thermal deformation. These metamaterials, constructed with curved bimaterial strips, can exhibit programmable and anisotropic thermal deformation through coding the unit cells. The fabricated metamaterials are verified experimentally and show unusual deformation modes.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Review
Chemistry, Inorganic & Nuclear
Naike Shi, Yuzhu Song, Xianran Xing, Jun Chen
Summary: Negative thermal expansion (NTE) is a counterintuitive phenomenon where unit cell volume of materials contracts upon heating. Framework structure materials, with flexible bridging units and large voids, facilitate transverse atomic vibrations leading to NTE. The magnitude of NTE is influenced by framework size and metal atom size, and can be controlled through chemical substitution, local structure distortion, and guest molecular or ion intercalation.
COORDINATION CHEMISTRY REVIEWS
(2021)
Article
Instruments & Instrumentation
Xiang-Long Peng, Swantje Bargmann
Summary: A method for designing 3D transversely isotropic auxetic lattice structures is proposed, and two new auxetic structures are designed based on it. The effective elastic properties of these structures in all loading directions are investigated computationally and analytically. The proposed structures exhibit both transverse and longitudinal auxeticities concurrently and separately, expanding the existing auxetic material space in terms of elastic anisotropy.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Chemistry, Inorganic & Nuclear
Huanli Yuan, Qilong Gao, Peng Xu, Juan Guo, Lunhua He, Andrea Sanson, Mingju Chao, Erjun Liang
Summary: Zn2GeO4 exhibits both negative and positive thermal expansion below and above room temperature, respectively. The negative thermal expansion is attributed to the transverse vibrations of O atoms in the four- and six-membered rings with ZnO4-GeO4 tetrahedra.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Haoyu Chen, Jiahao Shi, Abdolhamid Akbarzadeh
Summary: Triboelectric generators are integrated into architected materials, enabling the simultaneous harvesting of electricity and absorption of mechanical energy. Novel triboelectric mechanical metamaterials (TMMs) with distance-changing, angle-changing, and mixed modes are designed and tested under cyclic compressive load. The TMMs exhibit enhanced energy harvesting properties and are capable of motion sensing, shock absorption, and energy harvesting.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Naike Shi, Andrea Sanson, Alessandro Venier, Longlong Fan, Yang Ren, Danilo Oliveira de Souza, Luca Olivi, Yuzhu Song, Xianran Xing, Jun Chen
Summary: Chemical substitution can effectively control the thermal expansion properties in solid solutions. By synthesizing a series of solid solutions Cu2-xZnxP2O7, the thermal expansion in these materials can be tuned from strong negative to near zero and finally to positive with increasing content of Zn2+ substitution. The substitution of Zn2+ diminishes the rigidity of bonds and transverse vibrations of atoms, leading to negative thermal expansion.
SCRIPTA MATERIALIA
(2022)
Article
Mechanics
Fucong Lu, Xinqiang Chen, Yilin Zhu, Chuanbiao Zhang, Yuhang Hou
Summary: A novel metamaterial is proposed in this study by introducing bi-material double-triangular elements into a standard re-entrant structure. The effect of geometrical parameters on negative Poisson's ratio and coefficient of thermal expansion is investigated and verified. The results show that the structure provides tunable Poisson's ratios and has enhanced elastic modulus and tailorable coefficient of thermal expansion.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2022)
Article
Materials Science, Composites
Sicong Liu, Feiyin Li, Junsheng Peng, Xinping Zhang
Summary: Negative thermal expansion metamaterials (NTEMs) are important for ensuring thermal stability in extreme environments. However, there is currently no universal model for calculating the thermal expansion coefficient of bending-type two-dimensional NTEMs with chiral/anti-chiral structures. In this study, a universal model based on the simplification of NTEMs into point-line structures was proposed and validated through finite element simulations. The effects of material properties and structural parameters on the thermal expansion coefficient were investigated, and a method for achieving large |alpha T| was proposed.
COMPOSITES COMMUNICATIONS
(2023)
Article
Engineering, Civil
Jian Hao, Dong Han, Xue Gang Zhang, Yi Zhang, Wei Jiang, Xing Chi Teng, Jian Ping Lang, Yang Pan, Xi Hai Ni, Xiang Yu Zhang, Yi Min Xie, Xin Ren
Summary: A newly designed re-entrant elliptic perforated structure is proposed in this study, and it achieves the auxetic effect through the buckling of lightweight perforated plates. This structure exhibits the auxetic effect in large deformation, and the material utilization rate is greatly improved.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Mechanical
Xiang-Long Peng, Swantje Bargmann
Summary: The effective thermoelastic properties of three-dimensional lattice structures can be widely tunable by tailoring the microstructural geometry and constituent materials, exhibiting negative effective Poisson's ratios. If the walls have different thermal expansion coefficients, they can achieve isotropic negative or positive effective thermal expansion coefficients.
EXTREME MECHANICS LETTERS
(2021)
Article
Mechanics
Xiang-Long Peng, Swantje Bargmann
Summary: A novel lattice structure with tension-compression asymmetrical effective elastic properties has been designed by utilizing unilateral contact and the Poisson effect. The structure can exhibit positive or negative Poisson's ratio in both soft and hard states, with the degree of tension-compression asymmetry being widely tunable through geometric parameters and constituent material properties.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Biomedical
Jens Lamsfuss, Swantje Bargmann
Summary: This study analyzes the mechanical behavior of skeletal muscles at different levels, investigating the material behavior of muscle fibers and endomysium, as well as local stress and strain under different strains. Simulation results help identify potential damage areas and optimal arrangements under different pennation angles.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
B. Alheit, S. Bargmann, B. D. Reddy
Summary: Interlocking composites have gained popularity due to the impressive performance of natural interlocking protective structures. This study investigates the dynamic mechanical behavior and structure-property relationship of sutures using finite element analysis, revealing that sutures can tailor a structure's behavior at different deformation levels.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Instruments & Instrumentation
Xiang-Long Peng, Swantje Bargmann
Summary: A method for designing 3D transversely isotropic auxetic lattice structures is proposed, and two new auxetic structures are designed based on it. The effective elastic properties of these structures in all loading directions are investigated computationally and analytically. The proposed structures exhibit both transverse and longitudinal auxeticities concurrently and separately, expanding the existing auxetic material space in terms of elastic anisotropy.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Biomedical
Xiang-Long Peng, Subin Lee, Jana Wilmers, Sang Ho Oh, Swantje Bargmann
Summary: The mechanical properties and failure behavior of nacre are strongly orientation-dependent due to its brick-and-mortar microstructure. Experimental and simulation studies have shown how nacre's performance varies under different loading conditions, providing valuable insights for designing artificial composites with enhanced properties.
ACTA BIOMATERIALIA
(2022)
Article
Engineering, Biomedical
B. Alheit, S. Bargmann, B. D. Reddy
Summary: This study investigates the behavior of structures containing sutures during predator attacks and finds that sutures can improve the protective performance of structures by reducing the strain energy density and increasing resilience to failure. The results of this research have significant practical implications for the biomimetic design of protective structures.
ACTA BIOMATERIALIA
(2022)
Article
Engineering, Mechanical
Philipp Kowol, Swantje Bargmann, Patrick Goerrn, Jana Wilmers
Summary: Stretchable electronics utilize soft polymers and microstructural designs to enhance the stretchability of electronic materials. The introduction of controlled cracks in the polymer substrate's surface can significantly increase macroscopic stretchability. The design of soft islands demonstrates outstanding strain relief capabilities and allows for the integration of rigid functional parts.
EXTREME MECHANICS LETTERS
(2022)
Article
Engineering, Biomedical
Jens Lamsfuss, Swantje Bargmann
Summary: Skeletal muscle has high damage tolerance due to its high toughness, which allows it to withstand cracks while maintaining most of its strength. This study focuses on analyzing the damage behavior in muscle fibers and fascicles, where most serious muscle injuries occur. The results show that the endomysium does not transfer high strains, providing protection to adjacent undamaged fibers. Additionally, titin plays a significant role in stabilizing pre-damaged muscle fibers, resulting in minimal reduction in macroscopic strains of fascicles.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2022)
Article
Multidisciplinary Sciences
Sang Ho Oh, Jin-Kyung Kim, Yue Liu, Michael Wurmshuber, Xiang-Long Peng, Jinsol Seo, Jiwon Jeong, Zhen Wang, Jana Wilmers, Celal Soyarslan, Jongil Kim, Boonsita Kittiwirayanon, Jeehun Jeong, Hyo-Jeong Kim, Yang Hoon Huh, Daniel Kiener, Swantje Bargmann, Huajian Gao
Summary: Through studying the microstructure of limpet teeth, we found that this unique structure allows materials to exhibit negative Poisson's ratio behavior while maintaining high strength. These findings are important for designing biomimetic auxetic materials with extreme strength and high stiffness.
Article
Mechanics
Jens Lamsfuss, Swantje Bargmann
Summary: In this study, the impact of thermotherapy and cryotherapy on trigger points in fascicles was investigated using a microstructural model. The mechanisms of different thermal treatments for relieving muscle pain were examined, showing that heating reduces pain by decreasing compressive strains and compressive passive stresses in the trigger point, while cooling increases muscle tension. Long-term treatment also reduces pain in trigger points during both heating and cooling.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Computer Science, Software Engineering
Christoph Leuther, Jana Wilmers, Swantje Bargmann
Summary: Nowadays, the development of functional and high-performance materials relies on understanding the structure-property relationships gained from computational simulations. The microstructure of nacre, consisting of tiny aragonite platelets embedded in a biopolymer matrix, provides insights into nature's solutions to complex engineering problems and can be applied to the design of new materials. This article provides codes for generating periodic models of nacre with a wide variety of structure geometries.
Article
Computer Science, Software Engineering
Jens Lamsfuss, Swantje Bargmann
Summary: Python codes are provided for generating computer models of skeletal muscle on different hierarchical levels. The codes are parameterized and flexible, allowing for the generation of diverse muscle structures.
Article
Engineering, Mechanical
Rosaria Del Toro, Maria Laura De Bellis, Marcello Vasta, Andrea Bacigalupo
Summary: This article presents a multifield asymptotic homogenization scheme for analyzing Bloch wave propagation in non-standard thermoelastic periodic materials. The proposed method derives microscale field equations, solves recursive differential problems within the unit cell, establishes a down-scaling relation, and obtains average field equations. The effectiveness of this approach is validated by comparing dispersion curves with those from the Floquet-Bloch theory.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Yue Bao, Zhengcheng Yao, Yue Zhang, Xueman Hu, Xiandong Liu, Yingchun Shan, Tian He
Summary: This paper proposes a novel triple-gradient phononic acoustic black hole (ABH) beam that strategically manipulates multiple gradients to enhance its performance. The study reveals that the ABH effect is not solely brought about by the thickness gradient, but also extends to the power-law gradients in density and modulus. The synergistic development of three different gradient effects leads to more pronounced and broader bandgaps in PCs.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Matthias Ryser, Jason Steffen, Bekim Berisha, Markus Bambach
Summary: This study investigates the feasibility of replacing complex experiments with multiple simpler ones to determine the anisotropic yielding behavior of sheet metal. The results show that parameter identifiability and accuracy can be achieved by combining multiple specimen geometries and orientations, enhancing the understanding of the yield behavior.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Wenjun Li, Pengfei Zhang, Siyong Yang, Shenling Cai, Kai Feng
Summary: This study presents a novel two-dimensional non-contact platform based on Near-field Acoustic Levitation (NFAL), which can realize both one-dimensional and two-dimensional transportation. Numerical and experimental results prove the feasibility and ease of this method.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Shuo Liu, Lu Che, Guodong Fang, Jun Liang
Summary: This study presents a novel lamina conjugated bond-based peridynamic (BB-PD) model that overcomes the limitations of material properties and is applicable to composite laminates with different stacking sequences. The accuracy and applicability of the model are validated through simulations of elastic deformation and progressive damage behavior, providing an explanation of the damage modes and failure mechanisms of laminated composite materials subjected to uniaxial loading.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Omar El-Khatib, S. Kumar, Wesley J. Cantwell, Andreas Schiffer
Summary: Sandwich-structured honeycombs (SSHCs) are hierarchical structures with enhanced mass-specific properties. A model capable of predicting the elastic properties of hexagonal SSHCs is presented, showing superior in-plane elastic and shear moduli compared to traditional honeycombs, while the out-of-plane shear moduli are reduced.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Zhi-Jian Li, Hong-Liang Dai, Yuan Yao, Jing-Ling Liu
Summary: This paper proposes a process-performance prediction model for estimating the yield strength and ultimate tensile strength of metallic parts fabricated by powder bed fusion additive manufacturing. The effect of main process variables on the mechanical performance of printed metallic parts is analyzed and the results can serve as a guideline for improvement. The accuracy of the proposed model is validated by comparison with literature.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Saman A. Bapir, Kawa M. A. Manmi, Rostam K. Saeed, Abdolrahman Dadvand
Summary: This study numerically investigates the behavior of an ultrasonically driven gas bubble between two parallel rigid circular walls with a cylindrical micro-indentation in one wall. The primary objective is to determine the conditions that facilitate the removal of particulate contamination from the indentation using the bubble jet. The study found that the bubble jet can effectively remove contamination from the indentation for certain ranges of indentation diameter, but becomes less effective for larger indentation diameters.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
E. Polyzos, E. Vereroudakis, S. Malefaki, D. Vlassopoulos, D. Van Hemelrijck, L. Pyl
Summary: This research investigates the elastic and damage characteristics of individual composite beads used in 3D printed composites. A new analytical probabilistic progressive damage model (PPDM) is introduced to capture the elastic and damage attributes of these beads. Experimental results show strong agreement with the model in terms of elastic behavior and ultimate strength and strain.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
