Article
Materials Science, Multidisciplinary
Ding Tang, Leilei Zhao, Huamiao Wang, Dayong Li, Yinghong Peng, Peidong Wu
Summary: The study investigates the effect of nanoscale rough surfaces on metallic materials through nano-indentation tests and finite element simulations. An updated Nix-Gao relation considering surface roughness was proposed, which effectively captures the nanoindentation behavior of Sb-Pd alloy and Nickel.
MECHANICS OF MATERIALS
(2021)
Article
Engineering, Mechanical
Shaonan Lu, Baowen Zhang, Yuanyuan Ma, Yueting Zhou, Xuefen Zhao, Shenghu Ding
Summary: This study analyzes the plane thermoelastic problem of one-dimensional hexagonal quasicrystals containing a nano-open crack using surface elasticity theory, obtaining closed form solutions to describe the thermoelastic field at the crack region. The influence of surface effects, applied loads, and multi-field coupling effects on thermal stress intensity factors and strain energy density factors at the crack tip is discussed, with numerical results showing that surface effects have a significant impact on thermal stress intensity factors under small applied loads and can inhibit the propagation of nano-open cracks.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Z. Y. Liang, G. M. Pharr
Summary: This study investigates the indentation size and rate effects in materials. Experimental results show that the size effect of tungsten single crystal is independent of strain rate. The authors propose a decoupling formula that successfully explains the observed size and rate dependencies.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Chemistry, Multidisciplinary
Jamshed Haneef, Datta Markad, Renu Chadha, Amit Kumar, Navin Kumar
Summary: The mechanical properties of drug molecules are important for their processing into finished products. This study focuses on the mechanical anisotropy in two polymorphs of ambrisentan. Nanoindentation experiments showed that form I has higher hardness and elastic modulus compared to form II. The differences in mechanical properties were explained by differences in crystal structure and intermolecular interactions. Overall, form II exhibited higher plasticity and tabletability than form I. This study highlights the importance of crystal structure in determining the mechanical performance of drug crystals.
Article
Chemistry, Analytical
Xiaolin Zhu, Jijun Li, Lihua Zhang, Fengchao Lang, Xiaohu Hou, Xueping Zhao, Weiguang Zhang, Chunwang Zhao, Zijian Yang
Summary: In this study, nanoindentation tests were carried out on an a-plane (11 (2) over bar0) ZnO single crystal under three different strain rates to examine its nano-scale mechanical behavior. The load-indentation-depth curves, pop-in events, hardness, and Young's moduli were investigated. The results showed that the strain rate influenced the load and indentation depth, and affected the occurrence and characteristics of the pop-in event. The hardness and Young's modulus exhibited positive strain-rate sensitivity.
Article
Materials Science, Multidisciplinary
Yanan Liu, Ye Ding, Liangliang Xu, In Wha Jeong, Lijun Yang
Summary: In this study, a one-step fs laser-induced monocrystalline silicon structure was fabricated to enhance its nano-hardness properties. The results revealed three layers in the irradiated structure: an amorphous silicon layer, a dislocation layer, and a silicon crystal layer. The dislocation layer, with numerous dislocations and lattice distortions, positively influenced the nano-hardness of the irradiated structure, while the silicon crystal layer remained unaffected by laser irradiation.
Article
Chemistry, Physical
Shu-Wen W. Chen, Jean-Marie Teulon, Harinderbir Kaur, Christian Godon, Jean-Luc Pellequer
Summary: Measuring the structural stiffness is a method to study the elastic response of materials under external indentation, with the goal of revealing how nanostructured components or physiological circumstances affect the material's elastic behavior. In this study, atomic force microscopy (AFM) was used with a nano-scale pyramidal tip to indent the surfaces of polyacrylamide gels and Arabidopsis thaliana seedling roots with different softness. The stiffness-depth curve derived from the measured force showed heterogeneous elasticity. The responding force was decomposed into depth-impact, Hookean, and tip-shape components, called trimechanic, allowing the researchers to observe how these three restoring nanomechanics change with depth. The trimechanic theory provides insights into the restoring nanomechanics of indented materials and can differentiate the softness between different gel categories.
NANOSCALE HORIZONS
(2023)
Article
Materials Science, Multidisciplinary
Huai-Rong Xiao, Li-Xun Cai, Xiao-Kun Liu, Chang-Bing Ji
Summary: A theoretical indentation model based on the energy-density equivalence is proposed in this study to describe the mechanical properties of structural materials. The experiments show that the model accurately predicts the stress-strain curves and strengths of materials, and agrees closely with the results of conventional hardness tests.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
S. Gordon, F. Garcia-Marro, T. Rodriguez-Suarez, J. J. Roa, E. Jimenez-Pique, L. Llanes
Summary: The severe conditions of hard machining operations require tools with exceptional mechanical properties. This study investigates the damage scenario of polycrystalline cubic boron nitride (PcBN) through controlled damage induction. The results show that higher-grade PcBN exhibits higher resistance to crack nucleation and a more gradual transition between damage scenarios, which can be attributed to the higher hardness and fracture toughness of that grade. The different crack paths and toughness mechanisms observed in the PcBN grades contribute to their effective crack growth resistance. Higher fracture toughness is observed in the grade with a higher content of cBN particles, while the grade with a lower amount of superhard particles shows lower crack growth resistance. These differences in crack resistance are key in understanding enhanced contact damage behavior.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
T. J. F. Southern, J. E. Campbell, C. Fang, A. Nemcova, A. Bannister, T. W. Clyne
Summary: Hardness testing and Profilometry-based Indentation Plastometry (PIP) can both be used to obtain features of stress-strain curves. However, the data handling procedures for the two tests are very different. Hardness testing provides a semi-quantitative indication of resistance to plastic deformation, while PIP testing allows for the complete stress-strain curve to be obtained through modeling.
MECHANICS OF MATERIALS
(2023)
Article
Multidisciplinary Sciences
Oliver Campbell, Tom Blenkinsop, Lisa Mol, Oscar Gilbert
Summary: This study investigates the subsurface damage caused by bullet impacts to built heritage during armed conflicts. Controlled firearm experiments were conducted on sandstone and limestone buildings to simulate conflict damage. The results show that bullet impacts create conical fractures, radial fractures, spallation, and craters. The nature of the damage is influenced by the properties of the target material, with regions close to the impact at increased risk of future deterioration. Understanding the formation of subsurface damage is essential for future surveying and post-conflict assessments.
Article
Materials Science, Ceramics
Onur Arslan
Summary: In literature, it is shown that material gradation can inhibit surface crack initiation in glass/ceramic composites subjected to Hertzian indentation. However, surface cracks could still occur due to higher loadings or the presence of surface flaws/defects. Therefore, it is important to characterize graded composites regarding their resistance against Hertzian crack initiation and propagation.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Mechanics
Lihong Wang, Liyuan Wang, Hongjun Han, Wei Han, Yu Wang
Summary: In this paper, the two-dimensional nano-contact problem with surface effect was systematically investigated using Chen-Yao's surface elastic theory. The study found that the surface energy density of the indented bulk substrate is a key factor influencing contact properties, and numerical results showed significant differences between theoretical predictions with and without surface effects under specific conditions, indicating that surface effect led to substrate hardening.
ARCHIVE OF APPLIED MECHANICS
(2021)
Article
Engineering, Chemical
W. Sekkal, M. Izadifar, A. Zaoui, N. Ukrainczyk, E. Koenders
Summary: Improving the durability of metakaolin aluminosilicate materials (geopolymer) is a challenge in the building industry. Modifying the surface properties of these materials, such as by coating with graphene, can enhance their resistance to water infiltration. This study investigates the atomic-level interactions between water droplets and a graphene-coated geopolymer surface, and reveals the crucial role of interfacial chemical bonding in increasing the material's stability and reducing water permeability.
Article
Materials Science, Multidisciplinary
Huanjian Xie, Zili Liu, Xiqin Liu, Fang Liu, Pingze Zhang, Jian Li
Summary: A new hexagonal phase AlZnY was discovered in the Mg-4Y-Al-3Zn alloy for the first time in this study, and its deformation behavior and hardness were evaluated, providing new data for the study of the Mg-Y-Al-Zn alloy system.
Article
Mechanics
Zhiqiang Meng, Xu Gao, Hujie Yan, Mingchao Liu, Huijie Cao, Tie Mei, Chang Qing Chen
Summary: This paper presents a cage-shaped, self-folding mechanical metamaterial that exhibits multiple deformation modes and has tunable mechanical properties, providing multifunctional applications in various fields.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Hasan Murat Oztemiz, Semsettin Temiz
Summary: Sandwich panel composites have various applications and their mechanical behavior and performance depend on material properties and geometry. The load-carrying capacity of S-core composite sandwich panels increases with the increase of the core wall thickness, but decreases with the increase of the core height.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Yang Sun, Wei Zhang, Weipeng Hu, Mabao Liu
Summary: The study presents a novel computational framework to investigate the effect of graphene percolation network on the strength-ductility of graphene/metal composites. It utilizes the Cauchy's probabilistic model, the field fluctuation method, and the irreversible thermodynamics principle.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Elaheh Kazemi-Khasragh, Juan P. Fernandez Blazquez, David Garoz Gomez, Carlos Gonzalez, Maciej Haranczyk
Summary: This study explores group interaction modelling (GIM) and machine learning (ML) approaches for predicting thermal and mechanical properties of polymers. ML approach offers more reliable predictions compared to GIM, which is highly dependent on the accuracy of input parameters.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Yafei Yin, Shaotong Dong, Dong Wu, Min Li, Yuhang Li
Summary: This paper investigates a bending-induced instability in sandwiched composite structures, and establishes a phase diagram to predict its characteristics. The results are of great significance in understanding the physical mechanisms of bending instability and providing design guidelines for practical applications.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Dhairya R. Vyas, Sharen J. Cummins, Gary W. Delaney, Murray Rudman, Devang V. Khakhar
Summary: In this study, multiple collisions of granules on a substrate are analyzed using Collisional Smooth Particle Hydrodynamics (CSPH) to understand the influence of impact-induced deformation on subsequent collision dynamics. It is found that the collision dynamics are dependent on the impact location and the deformation caused by preceding impacts. The accuracy of three theoretical models is also evaluated by comparing their predictions with CSPH results, and it is discovered that these models are only useful for predicting collisions at the same location repeatedly.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Sneha B. Cheryala, Chandra S. Yerramalli
Summary: The effect of hybridization on the growth of interface crack along the fiber is predicted. The study shows an enhancement in the compressive splitting strength with hybridization due to the lateral confinement effect on the interfacial crack.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Xiang-Nan Li, Xiao-Bao Zuo, Liang Li, Jing-Han Liu
Summary: A multiscale mechanical model is proposed to quantitatively describe the macro-mechanical behavior of fiber reinforced concrete (FRC) based on its multiscale material compositions. The model establishes the stiffness and strength equations for each scale of FRC and demonstrates the influence of steel fiber parameters on the mechanical properties of FRC.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Vicente Ramirez-Luis, Hilario Hernandez-Moreno, Orlando Susarrey-Huerta
Summary: In this paper, a Multicell Thin-walled Method is developed for studying the stress distributions in multimaterial beams. This method accurately obtains complex stress fields while reducing the solution time and computational cost. Validation with the finite element method confirms the accuracy of the proposed method.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Yanfeng Zheng, Siyuan Li, Jingyao Zhang, Yaozhi Luo
Summary: This study proposes an enhanced simplified model based on finite particle method (FPM) to consider the link cross-sectional size and contact in Bennett linkages. The model introduces virtual beams and contact forces to accurately simulate the real-world behavior of Bennett linkages. The proposed method is effective for dynamic analysis of large-scale deployable Bennett linkages and shows great potential.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Viktoriya Pasternak, Heorhiy Sulym, Iaroslav M. Pasternak
Summary: This paper investigates anisotropic elastic, magnetoelectroelastic, and quasicrystal solids and presents their equations of time-harmonic motion and constitutive relations in a compact and unified form. A matrix approach is proposed to derive the 3D time-harmonic Green's functions for these materials. The effects of phason field dynamics on the phonon oscillations in quasicrystals are studied in detail. The paper provides a strict proof that the eigenvalues of the time-harmonic magnetoelectroelaticity problem are all positive. It also demonstrates the application of the obtained time-harmonic Green's functions in solving boundary value problems for these materials using the derived boundary integral equations.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Jan Tomec, Gordan Jelenic
Summary: This paper investigates the relationship between different formulations and contact-force models in beam-to-beam contact mechanics. It specifically addresses the recently developed mortar method and develops its variant based on the penalty method. The developed elements are tested using the same examples to provide an objective comparison in terms of robustness and computational cost.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Paulo Teixeira Goncalves, Albertino Arteiro, Nuno Rocha, Fermin Otero
Summary: This work presents a novel formulation of a 3D smeared crack model for unidirectional fiber-reinforced polymer composites based on a stress invariant approach for transverse yielding and failure initiation. The performance of the model is evaluated using monotonic and non-monotonic damage evolution, verified with single element tests and compared with experimental results.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Hanbin Yin, Yinji Ma, Xue Feng
Summary: This paper investigates the peeling behavior of a viscoelastic film bonded to a rigid substrate and establishes a theoretical peeling model. The study reveals three typical relationships between the peeling force and peeling velocity, which depend on the viscous dissipation within the film and the rate-dependent adhesion at the interface. Additionally, factors such as film thickness, interfacial toughness, and interfacial strength are identified as influencing the steady-state peeling force.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Peter Noe Poulsen, John Forbes Olesen
Summary: Finite Element Limit Analysis (FELA) is increasingly used to calculate the ultimate bearing capacity of structures made of ductile materials. This study presents a consistent and general weak formulation based on virtual work for both the lower and upper bound problem, ensuring uniqueness of the optimal solution. A plane element with linear stress variation and quadratic displacement field is introduced, showing good results for load level, stress distribution, and collapse mechanism even for coarse meshes in verification and reinforced concrete examples.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)