Article
Chemistry, Physical
Afshin Ghanaei, Hossein Edris, Hossein Monajati, Bejan Hamawandi
Summary: This study investigated the effect of adding Nb and V alloying elements on the strength of ultra-low carbon steel after bake hardening, and analyzed the influence of pre-strain, grain size, and recrystallization annealing temperature on the yield stress caused by the bake hardening process. The results showed that increasing pre-strain and annealing temperature led to higher baking hardness, and the presence of V reduced the annealing temperature.
Article
Materials Science, Multidisciplinary
V. L. Berdichevsky
Summary: This study identifies the scaling properties of dislocation dynamics involving temperature and Burgers vector, and conjectures that these properties should hold in general cases. Experimental data compilation supports this conjecture. To describe the scale-invariant experimental dependencies, a scale-invariant form of stress-strain rate-temperature constitutive relation is suggested in this study. The constitutive equation also considers the nontrivial rigid-viscous limit when thermal fluctuations approach zero.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Construction & Building Technology
Julian Carrillo, Harold Lozano, Carlos Arteta
Summary: The study examines the mechanical properties of steel bars sold in the Bogotá market and the impact of imported steel bars that do not meet the requirements on local building codes. Through statistical analysis of experimental data, important references are provided for future research on the structural performance and reliability of reinforced concrete structures in central Colombia.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Chaoyue Zhao, Xianhua Chen, Teng Tu, Ziyi Wang, Yuan Yuan, Fusheng Pan
Summary: This study investigated the effect of temperature on the strain-hardening behaviors of binary Mg-3X alloys. As temperature increases, the strain-hardening ability decreases due to stronger dynamic recovery. However, Mg-3Y and Mg-3Gd alloys may exhibit a periodic serrated hardening curve at elevated temperatures, resulting from dynamic strain aging (DSA) effect. The differences in strain-hardening behavior at various temperatures are mainly related to diffusion coefficients of alloying elements in the alpha-Mg matrix.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Engineering, Mechanical
Fenfei Hua, Dabiao Liu, Yuan Li, Yuming He, D. J. Dunstan
Summary: This study investigates the mechanical properties of thin foils in bending, tension, and constrained layers through experiments and simulations. The passivated layer significantly increases the flow stress of the foil, while the dissipative gradient terms contribute to the increased yield strength and the energetic gradient terms lead to increased strain hardening and an anomalous Bauschinger effect.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Construction & Building Technology
Bo Wen, Ding Huang, Lu Zhang, Qiyu Song, Guanyi Gao, Dewen Huo
Summary: A numerical model of coal gangue concrete based on a mesoscale was established to study its mechanical properties and failure modes. Increasing the mortar strength can increase the peak stress and brittleness of the concrete. The size effect of coal gangue concrete is more significant, and conversion factors should be considered.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Tianyi Zhao, Yue Zhao, Zhandong Wan, Pengcheng Shang, Aiping Wu, Quan Li, Dongyang Yan
Summary: The prediction of welding residual stresses (WRS) can be inaccurate if the mechanical property model of the material is inaccurate in the finite element model. In this study, the influence of temperature, working hardening, and anneal softening on the mechanical properties of TIG welded 2219-T8 aluminum alloy was investigated. Tensile properties were obtained using the Gleeble and DIC system, and working hardening and anneal softening were studied through tensile curves. A refined mechanical property model was then built for welding simulation. The results showed that anneal temperature had a significant influence on the longitudinal residual stress (LRS) in certain regions, and correct consideration of anneal softening led to lower LRS and reduced yield strength in these regions, while regions with lower maximum temperature were less affected by anneal softening.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Mechanical
Shubham Sanjay Joshi, Clement Keller, Lydie Mas, Williams Lefebvre, Eric Hug, Jean-Philippe Couzinie
Summary: In this article, the basic strain hardening mechanisms of AM (LPBF) alloys of a theoretically monophasic Ni20Cr alloy manufactured by laser powder bed fusion are investigated. The microstructure and tensile mechanical behavior of the alloys are analyzed and compared with conventionally manufactured Ni20Cr alloy. The results show that the LPBF samples exhibit an increase in yield stress due to effective stress and backstress modification. Additionally, the strain hardening mechanisms are modified for LPBF manufactured samples compared to cast ones. The study also highlights the contribution of specific LPBF microstructure features to stress and strain hardening.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Nanoscience & Nanotechnology
Hongliang Liu, Maicang Zhang, Min Xu, Ye Meng, Guohua Xu, Na Ta, Lei Zheng
Summary: The work-hardening characteristic of nickel-based GH4141 superalloy was investigated through uniaxial compression tests, revealing that during the plastic deformation stage, the true stress gradually increased while the hardening rate gradually decreased.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Weiling Cui, Ji Qiu, Hefeng Wang, Buyun Su
Summary: In this study, uniaxial compression tests combined with Digital Image Correlation Technique were conducted on Ti6Al4V alloy, and an ISE model was established based on this experimental data and strain gradient theory. The proposed model provides a direct and reasonable theory foundation to investigate ISE by uniaxial compression and bridges the gap between nanoindentation and uniaxial compression.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Xinglong An, Yan Li, Song Ni, Zhangwei Wang, Min Song
Summary: The investigation of cold-rolled cobalt revealed that various deformation mechanisms were activated during the process, leading to grain refinement to the nano scale. The Vickers hardness tests indicated a stable strain hardening process throughout the cold rolling process.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Abhinav Kumar Sharma, Saurabh S. Sharma, Sandeep Kumar Singh, Avinash Parashar
Summary: This article investigates the effect of helium nanobubbles on the mechanical properties of single-crystal nickel, finding that the presence of helium nanobubbles has a detrimental effect on the onset of plastic deformation in single-crystal nickel, with a higher helium atom concentration in the nanobubble having a more severe impact on mechanical strength. The results will contribute to a better understanding of deformation in irradiated nickel crystals.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Engineering, Civil
A. Hosseini-Hooshyar, A. Farhadi, A. Nayebi
Summary: This study discusses the modeling methods for small-scale plasticity behavior, introducing the strain or stress gradient plasticity models and the lower-order stress gradient plasticity model proposed by the stress gradient plasticity theory. It is found that the essential microscale plasticity behavior of metals can be captured with only one length scale parameter.
THIN-WALLED STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Xiaohong Li, Qin Sun, Xiaohu Zhang
Summary: This paper investigates parameters of a nonlinear combined hardening model considering the effect of pre-tensile stress. The results show that the changing trend of simulated stress-strain cyclic curves with initial conditions is more consistent with that of the test curve, predicting the ratchet effect of asymmetric cyclic loading. The presence of pre-tensile stress significantly affects the elastic-plastic mechanical behavior under stress-controlled loading.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Engineering, Civil
Juntian Hong, Ming Xu
Summary: This study introduces a new time-dependent strain hardening model for simulating the creep behavior of rockfill, validated through triaxial creep tests on granular materials. The results indicate that the proposed model more accurately predicts the long-term deformation of high rockfill geostructures compared to existing isotach models.
TRANSPORTATION GEOTECHNICS
(2021)
Article
Mechanics
K. C. Le, Y. Piao
ARCHIVE OF APPLIED MECHANICS
(2019)
Article
Engineering, Mechanical
K. C. Le, Y. Piao
INTERNATIONAL JOURNAL OF PLASTICITY
(2019)
Biographical-Item
Mechanics
Andrej Cherkaev, Khanh Chau Le
ARCHIVE OF APPLIED MECHANICS
(2019)
Article
Engineering, Multidisciplinary
K. C. Le, Y. Piao
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2019)
Article
Engineering, Multidisciplinary
K. C. Le, T. H. Le, T. M. Tran
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2020)
Article
Mechanics
K. C. Le, T. M. Tran
COMPOSITE STRUCTURES
(2020)
Article
Mechanics
K. C. Le
MECHANICS RESEARCH COMMUNICATIONS
(2020)
Article
Mechanics
F. Guenther, K. C. Le
Summary: This paper investigates the plane constrained shear problem for single crystals with one active slip system under the small strain thermodynamic dislocation theory proposed by Le. The numerical solution shows combined isotropic and kinematic work hardening, sensitivity of stress-strain curves to temperature and strain rate, Bauschinger effect, and size effect.
ARCHIVE OF APPLIED MECHANICS
(2021)
Article
Materials Science, Multidisciplinary
K. C. Le, S. L. Dang, H. T. Luu, N. Gunkelmann
Summary: This paper presents a modified version of the thermodynamic dislocation theory, which can fit the stress-strain curves of bcc crystals niobium, tantalum, tungsten, and vanadium over a wide range of temperatures and strain rates by employing a small set of physics-based material parameters identified through large scale least squares analysis.
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
(2021)
Article
Mechanics
Yinguang Piao, Khanh Chau Le
Summary: The thermodynamic dislocation theory incorporating dislocation impediment by grain boundaries was developed to analyze shear tests on polycrystals, successfully simulating stress-strain curves consistent with experimental data. Representative distributions of plastic slip were presented, explaining the extended transition stage during load reversal.
Article
Mechanics
K. C. Le, M. El Yaagoubi
Summary: The safe equilibrium variational principle for inhomogeneous elastic cracked bodies is formulated in this study, showing that crack remains in safe equilibrium as long as the maximum energy reduction rate of the virtually growing crack is negative. The crack starts to grow in the direction of the maximum energy reduction rate when it becomes zero, implying the criteria proposed by He and Hutchinson (1989). As an application, this criterion is used to predict the growth direction of an interface crack in a bimaterial.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Thermodynamics
Yinguang Piao, Khanh Chau Le
Summary: The thermodynamic theory of dislocation/grain boundary interaction is developed for non-uniform plastic deformations in polycrystals. A case study on the boundary conditions affecting work hardening of a bicrystal is conducted for three types of grain boundaries. The results show that different types of grain boundaries have different effects on work hardening.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2022)
Article
Engineering, Multidisciplinary
K. C. Le
Summary: An asymptotically exact first-order shear deformation theory for functionally graded elastic plates is derived using the variational-asymptotic method. An analytical solution to the problem of wave propagation in a sandwich plate is found in accordance with this refined theory. Comparison between the dispersion curves obtained by 2-D plate theory and 3-D elasticity theory reveals that the former is accurate up to the order of h(2)/l(2), where h is the plate thickness and l the wavelength.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Physics, Fluids & Plasmas
K. C. Le, H. Jeong, T. M. Tran
Summary: Two improvements are proposed for the theory of transition from brittle to ductile fracture developed by Langer. The first improvement includes the temperature dependence of the shear modulus to better quantify the thermally sensitive dislocation entanglement near the crack tip. The second improvement involves identifying the parameters of the improved theory using the largescale least-squares method. The comparison between the predicted fracture toughness and experimental values for tungsten shows good agreement.
Article
Multidisciplinary Sciences
J. S. Langer, K. C. Le
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Engineering, Multidisciplinary
Tohya Kanahama, Motohiro Sato
Summary: This study theoretically explains the effect of initial deflection and initial slope on self-buckling characteristics of heavy columns and proposes a formula characterizing the self-buckling problem. The results show that the greatest height is proportional to the 2/3 power of radius, and the formula can potentially predict the height of tree-like natural structures.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Aps Selvadurai, Alexander P. Suvorov
Summary: This paper examines the torsion of a solid cylinder made of a fluid-saturated porous medium with a hyperelastic porous skeleton. It analyzes the mechanics of the twisted cylinder in both short-term and long-term behaviors, using numerical solutions and the ABAQUSTM finite element code.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
S. Kanaun
Summary: This study focuses on spherical radially transverse isotropic heterogeneous inclusions in homogeneous isotropic conductive host media. The volume integral equation for the field in the medium with an isolated inclusion subjected to a constant external field is solved using Mellin-transform technique. The method allows revealing tensor structure of the solution with precision to one scalar function of radial coordinate. The study also investigates the influence of neutral inclusions and conductivity coefficients on the effective conductivity of the composite material.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Marinos Kattis, Vassilis Tsitsos, Vassilis Karatzaferis
Summary: The proposed model utilizes continuum mechanics to describe the mechanical behavior of a weakened interface between materials with microstructure, simulating the weakened interface using a surface elastic medium adhering on either side with bulk elastic continua. The model is able to investigate the effect of a weakened interface on stress concentration around inhomogeneities embedded in an unbounded matrix of Cosserat materials.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Shixiang Zhao, Yu. V. Petrov, Yuyi Zhang, G. A. Volkov, Zejian Xu, Fenglei Huang
Summary: This paper theoretically studies the thermal softening related to stress relaxation using the incubation time approach and examines the temperature-time correspondence. The developed relaxation model of plasticity (RP model) is analyzed and compared with other constitutive models and artificial neural networks. The advantages and disadvantages of different models are discussed, and the differences between the ANN model and other constitutive models are examined.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Ivan I. Argatov, Federico J. Sabina
Summary: This study models a seismic metabarrier as a cluster of single-degree-of-freedom resonator units and considers the scattering effects on pulsed Rayleigh waves caused by the vertical displacements of the resonators and the normal contact forces. The variation of the amplitude reduction factor due to the model parameters variation is studied in detail.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
