Article
Nanoscience & Nanotechnology
M. A. Kader, P. J. Hazell, M. A. Islam, S. Ahmed, M. M. Hossain, J. P. Escobedo, M. Saadatfar
Summary: This study investigated the strain rate sensitivity and deformation mechanisms of closed-cell aluminium foams under low-velocity impact loadings through instrumented drop-weight impact experiments and Finite Element (FE) modelling. Both the experiments and FE modelling showed significant rate sensitivity of the foam within the examined range of strain rates. The results collectively indicate that the rate sensitivity of the base material is primarily responsible for enhancing strength during impacts.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Farrukh Saleem, Shan Li, Shitang Cui, Xujiao Liu, Tianyu Xu, Lin Mei, Yi Bian, Chunguang Miao, Tianzhi Luo
Summary: This study investigates the mechanical behaviors of closed-cell aluminum foam (CCAF) under static and dynamic conditions, and the influence of strain rate and relative density on its properties. Micro-CT imaging and finite element analysis were used to study the foam's microstructure and validate the constitutive relation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Civil
S. Talebi, R. Hedayati, M. Sadighi
Summary: The study investigated the effects of different lattice structures on the stress-strain curves, first peak stress, and energy absorption capacity of closed-cell metal foams under varying foam density and impact velocity conditions. The results showed that unit cell topology plays a significant role in determining the mechanical behavior of closed-cell foams.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Laila Hossain, Emily Eastman, Monica De Rango, Vikram Singh Raghuwanshi, Joanne Tanner, Gil Garnier
Summary: The absorption capacity and kinetics of nanocellulose foams are controlled by the surface charge of the fibers, affecting swelling and network structure. The absorption process includes three stages: wicking, transition, and fiber swelling. Tuning the surface charge can modulate the absorption kinetics of nanocellulose foam.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Jutta Luksch, Thomas Bleistein, Kristian Koenig, Jerome Adrien, Eric Maire, Anne Jung
Summary: Microheterogeneous materials like metal foams have a strong structure-property relationship, where the macroscopic properties are influenced by factors such as pore geometry, strut geometry, and microstructure, especially grain structure. The differences in microtensile properties of aluminum foam struts were found to be mainly due to micro-porosity and primary inclusions, which are likely caused by the manufacturing process of investment casting. The study used ex situ and in situ microtensile tests to understand the scattering in micromechanical properties of individual struts, with in situ tests using high resolution X-ray computed tomography revealing the microstructural failure mechanisms.
Article
Chemistry, Physical
Yinzheng Xia, Jianchao Shi, Yongliang Mu
Summary: The drop hammer impact test and simulation study on closed-cell Al foams revealed that increasing density and impact velocity can enhance the energy absorption capacity of the specimens, but higher energy absorption does not necessarily indicate better cushioning performance.
Article
Engineering, Civil
Jianxun Zhang, Jinlong Du, Fuxing Miao, Haoyuan Guo
Summary: This paper studies the large deflection of the slender circular metal foam-filled tube under transverse loading through theoretical and numerical analysis. The yield criterion and analytical solution for the plastic behavior of the foam-filled tube are proposed, considering the interaction between bending, stretching, and foam strength. The numerical results confirm the accuracy of the analytical model. The influences of various factors on the load-carrying capacity and energy absorption of the foam-filled tubes are discussed in detail.
THIN-WALLED STRUCTURES
(2022)
Article
Polymer Science
Lucia Doyle, Ingo Weidlich
Summary: Polyethylene terephthalate (PET) foam is a popular choice for structural applications due to its good balance of mechanical properties and cost, as well as its recyclability and availability of recycled material. Aging tests under hygrothermal conditions show that PET foam does not undergo significant degradation, indicating its durability and suitability for long-term use.
POLYMER DEGRADATION AND STABILITY
(2022)
Article
Construction & Building Technology
D. M. Meyer, R. Combrinck
Summary: The study revealed that the shrinkage in concrete is isotropic even when cracks form, and settlement voids under reinforcing bars can quickly develop after casting the concrete, particularly in high evaporation conditions.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Girolamo Costanza, Fabio Giudice, Andrea Sili, Maria Elisa Tata
Summary: Researchers developed a predictive analytical model for the compressive behavior of closed-cell Al foams based on the correlation between cellular morphology and mechanical response, successfully simulating the entire compression stress-strain curve.
Article
Metallurgy & Metallurgical Engineering
Rajvir Singh, Ranvir Singh Panwar, J. D. Sharma, Rama Arora
Summary: The applications of aluminum foams in the automobile and aerospace sector are growing due to their unique properties. In this study, Al2024-B4Cp composite foams were developed and the effect of different sized B4C particles and wt % on foam characteristics and performance was investigated.
INTERNATIONAL JOURNAL OF METALCASTING
(2023)
Article
Materials Science, Composites
Yi He, Weiguo Li, Mengqing Yang, Pan Dong, Yanli Ma, Jiabin Yang
Summary: This study analyzed the effect of temperature and external force on the plastic collapse of metal foams, proposed energy density and models for the plastic collapse at different temperatures. The models are accurate and practical, enabling rapid prediction of energy absorption and plastic collapse strength of metal foams at different temperatures.
COMPOSITES COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Chenxi Lu, Chi Zhang, Pin Wen, Fei Chen
Summary: This paper investigates the fabrication and performance of Al-Si10-Mg gyroid surfaces with different level-set values, exploring their mechanical behavior and energy absorption characteristics through experimental and numerical methods. The understanding gained provides a new method for developing desired properties of implants or energy absorption applications by selecting an optimal combination of level-set value, thickness, periodicity, etc.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Tomislav Rodinger, Danko Coric, Zeljko Alar
Summary: The choice and mass fraction of foaming agents have a significant impact on the size and number of metal foam cells. Aluminium foams were produced using titanium hydride (TiH2) and calcium carbonate (CaCO3) as foaming agents. Foams foamed with TiH2 have much larger cells compared to CaCO3 agent. The quantity of CaCO3 affects the morphology of aluminium foam, with a smaller quantity of CaCO3 resulting in a macrostructure with smaller cells. The sphericity and compactness indicate that TiH2 foaming agent forms cells of a more regular shape compared to CaCO3 agent.
Article
Chemistry, Physical
Makoto Iizuka, Ryohei Goto, Petros Siegkas, Benjamin Simpson, Neil Mansfield
Summary: Polyurethane foams have unique mechanical properties depending on the parent material and microstructure. X-ray tomography and finite element analysis can be used to study the relationship between macroscopic mechanical properties and microscopic foam structure. X-ray scanning and CAD modeling are effective in simulating the compression behavior of polyurethane foam.
Article
Materials Science, Multidisciplinary
Baihong Chen, Changyue Liu, Zengting Xu, Zhijian Wang, Rui Xiao
Summary: In this study, both polydomain and monodomain liquid crystal elastomers (LCEs) were synthesized and their shape change with temperature under a certain stress level was characterized. A thermo-order-mechanical coupling model was developed to predict the shape change of LCEs, showing good consistency with experimental results.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Peng Wang, Fei Xu, Yiding Wang, Jun Song, Cheng Chen
Summary: This study investigates the interplay of super-screw dislocations and coherent twin boundary (CTB) in Ni3Al using molecular dynamics simulations and dislocation continuum theory. Various interaction mechanisms are observed depending on the stress and dislocation gliding pathways. A continuum model framework is developed to evaluate the critical shear stress required for CTB to accommodate dislocations along different pathways, considering the effects of anti-phase boundary (APB) and Complex Stacking Fault (CSF). The study suggests that the resistant force of CTB against all gliding dislocations is a more appropriate metric for quantifying its strength.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Chenyu Du, Haitao Cui, Hongjian Zhang, Zhibin Cai, Weikuo Zhai
Summary: A thermal-elastoplastic phase field model was developed to simulate thermal fatigue crack growth. The accuracy and availability of the model were verified through typical examples. The results indicate that the proposed model effectively simulates the process of thermal fatigue crack propagation in elastoplastic solids. The appropriate regularization length needs to be determined based on experimental results.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
J. Carlsson, A. Kuswoyo, A. Shaikeea, N. A. Fleck
Summary: The sensitivity of the compressive strength of a polymeric Kelvin lattice to the presence of an epoxy core is investigated both experimentally and numerically. The study shows that the epoxy core prevents the formation of crush bands in the lattice and changes its deformation mode. At finite strain, the strength of the lattice is degraded by bending failure and cracking of the struts and adjacent core, leading to the formation of vertical fissures.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Saptarshi Paul, Anurag Gupta
Summary: In this study, we investigate the geometry and mechanics of the buckled orthotropic von Karman elastic plate with free boundary condition, in the presence of an isolated positive or negative disclination. The shape of the buckled plate is cone-like for a positive disclination and saddle-like for a negative disclination. With increasing orthotropy, the shape of the buckled plate becomes more tent-like and the Gaussian curvature spreads along the ridge of the tent. The stress fields are focused in the neighborhood of the defect point and the ridge, indicating that most of the stretching energy is accommodated in these singular regions.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Antu Acharya, Vikram Muthkani, Anirvan DasGupta, Atul Jain
Summary: This study proposes filler-based and infill-based strategies for creating auxetic lattices with enhanced stiffness. The elastic properties of the sinusoidal re-entrant honeycomb lattice are developed and validated using finite element models. Parametric studies are conducted to find combinations leading to enhanced stiffness with minor loss in auxeticity. The results demonstrate the possibility of achieving a significant increment in stiffness while retaining significant auxeticity. The proposed approaches outperform existing approaches in terms of stiffness and auxeticity.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Biswajit Pal, Ananth Ramaswamy
Summary: This study presents a multi-scale approach to simulate the shrinkage and creep of concrete, addressing the limitations of existing macroscopic prediction models due to the heterogeneous nature of concrete. The model is validated with experimental data and compared to national codes and macroscopic models, demonstrating its effectiveness in overcoming the gaps in existing models.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Akash Kumar Behera, Mohammad Masiur Rahaman, Debasish Roy
Summary: Ceramics have attractive properties but low fracture toughness is a major drawback. There is interest in improving the mechanical performance of ceramics by tailoring residual stresses. However, there is a lack of computational models that can accurately predict crack paths and quantify the improved fracture toughness.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Bineet Kumar, Sandeep Kumar Dubey, Sonalisa Ray
Summary: This study aims to develop an energy-based theoretical formulation for predicting the evolution of the fracture process zone in concrete under fatigue loading. Experimental results and calibrations indicate that the specimen size and aggregate size affect the fracture behavior and process zone length of concrete.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Zheliang Wang, Hao Sheng, Xinyi Lin, Yifan Rao, Jia Liu, Nanshu Lu
Summary: In this study, an analytical framework is proposed for investigating the behavior of laminated beams with any number of layers under various bending conditions, and the theory is validated through finite element analysis. It was found that the number of layers, applied deformation, layer properties, and layer aspect ratio have an impact on the equivalent flexural rigidity.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Michael Schwaighofer, Markus Konigsberger, Luis Zelaya-Lainez, Markus Lukacevic, Sebastian Serna-Loaiza, Michael Harasek, Florian Zikeli, Anton Friedl, Josef Fussl
Summary: In this study, nanoindentation relaxation tests were re-evaluated on five industrial lignins extracted from different feedstocks. It was found that the viscoelastic properties of all tested lignins were practically identical and independent of the feedstock and the extraction processes.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Tian Han, Dandan Qi, Jia Ma, Chaoyang Sun
Summary: In this study, a generative design method was used to propose new modified lattice structures suitable for tensile and compressive loading conditions. By conducting experimental and finite element analyses, it was confirmed that the derived structures have improved load-bearing capacity and energy absorption compared to the original structures. The effects of shape parameters on mechanical properties were also discussed.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Wenbin Zheng, Jay Airao, Ramin Aghababaei
Summary: Spinodal decomposition of Ti1-xAlxN crystal structure significantly affects their physical properties. This study uses three-dimensional molecular dynamics simulations to investigate the phase transformation mechanism and surface finish during material removal in TiAlN. The simulations reveal that the aluminum content and cutting depth have a significant influence on the phase transformation process through spinodal decomposition.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Atasi Ghosh
Summary: The micro-mechanism of low cycle fatigue deformation behavior has been summarized and the recent development in the approach of numerical simulation of cyclic stress-strain behavior of polycrystalline metallic materials at multi-scale has been discussed.
MECHANICS OF MATERIALS
(2024)