Article
Nanoscience & Nanotechnology
Xingli Gu, Yunbo Xu, Xu Wang, Rendong Liu, Fei Peng, Hongliang Liu, R. D. K. Misra, Jiayu Li, Xiaoying Hou
Summary: This study investigated the microstructural evolution of a newly developed TRIP-assisted steel during an overall annealing cycle, compared with traditional cold-rolled TRIP steel. The results revealed that the new austenite obtained during intercritical annealing was fine-grained and uniformly-distributed, comprising of acicular or blocky structures. The amount of retained austenite increased with Mpre content, with similar stability against martensite transformation during tensile testing.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
Akash Gupta, Surya R. Kalidindi
Summary: This study addresses the main challenges encountered in using spectral databases in finite element models, linking them to biases introduced in the formulation of the databases. Specific strategies and improvements have been implemented to address instabilities and inaccuracies in the spectral crystal plasticity finite element method (SCPFEM) framework. The enhancements to the databases have significantly improved the accuracy of stress-strain responses and jacobians, as demonstrated in selected case studies.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Engineering, Mechanical
Ronan J. Devaney, Richard A. Barrett, Padraic E. O'Donoghue, Sean B. Leen
Summary: This paper presents a physically-based cyclic viscoplasticity model to capture the influence of welding-induced microstructural transformation on the fatigue response of the bainitic high-strength low-alloy steel, X100Q. The study found that a refined bainitic block structure is the primary microstructural feature contributing to monotonic and cyclic strength in the materials, while the coarsening of the bainitic lath structure leads to cyclic softening behavior.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
Dong Wang, Lei Zhao, Lianyong Xu, Yongdian Han, Kangda Hao
Summary: Irradiation hardening plays a crucial role in the mechanical property and service lifetime of structural materials in nuclear power plants. Dislocation loops and small bubbles are identified as the main causes of irradiation hardening. A phase field model coupled with crystal plasticity is proposed to predict irradiation hardening, providing more accurate results and reducing uncertainty in assessment.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Yang Wang, Mei Zhang, Qiongying Cen, Weijun Wang, Xiaoyun Sun
Summary: This study proposed a novel process combining thermal deformation and intercritical annealing to improve the mechanical properties and prevent Luders strain in steel. The experiment results showed that the microstructure had a significant impact on the nucleation and growth of austenite during intercritical annealing, ultimately affecting the morphology, grain size, volume fraction, and stability of retained austenite. Additionally, the sample obtained using this process exhibited improved mechanical properties and eliminated Luders strain, and the process itself was simple and cost-effective.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Multidisciplinary Sciences
Tianhao Wang, Shivakant Shukla, Bharat Gwalani, Subhasis Sinha, Saket Thapliyal, Michael Frank, Rajiv S. Mishra
Summary: This study explores a novel solid-state alloying method called friction stir alloying to modify the composition of a TWIP high-entropy alloy with titanium, activating multiple deformation mechanisms simultaneously. Through the formation of hard Ni-Ti rich precipitates and depletion of nickel in certain regions, TRIP-based deformation and TWIP deformation are induced within the alloy, enhancing its engineering properties. The approach presented in this study offers a unique way to design alloys with a combination of optimized local compositions that can activate various deformation mechanisms.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
M. J. Rezaei, M. Sedighi, M. Pourbashiri
Summary: The research aims to investigate the multi-scale crystal plasticity of polycrystalline materials using a hierarchical computational framework and macro/micro structure analysis. Several numerical studies on the evolution of microstructure and texture in pure aluminum under torsion were performed, revealing crystal misorientation. The framework was integrated into ABAQUS finite element package using DAMASK software and compared with experimental data of EBSD. The findings showed that the torsion texture was attributed to dislocation sliding and could be predicted by crystal plasticity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Mechanical
Rou Du, Xiaodan Zhang, Huamiao Wang, Xiaoming Liu, Yueguang Wei
Summary: In this work, a revised Chaboche model is proposed based on a crystal plasticity multiscale approach. Experiments show that 316L steel exhibits two plasticity characteristics during cyclic loading at room temperature: variable plastic modulus in strain-controlled cycling and continuous growing ratcheting strain in stress-controlled cycling. These characteristics cannot be predicted by the classic Chaboche model. By considering the microstructure effect and the viscous effect, the revised model successfully predicts the strain- and stress-controlled cyclic behaviors observed in experiments. The potential application of the revised model in integrated structural analysis is also discussed.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Jiahao Cheng, Xiaohua Hu, Michael Kirka
Summary: High-cycle fatigue life in metallic materials is affected by microstructure features, but traditional data-based approaches lack consideration for microstructure and crystal plasticity-based methods are computationally expensive. In this study, an acceleration method based on the cycle-jump approach was developed for efficient microstructure-based high-cycle fatigue finite element simulation.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Nanoscience & Nanotechnology
Anup Pandey, Reeju Pokharel
Summary: The machine learning based surrogate modeling method presented in this study can predict the spatially resolved 3D crystal orientation evolution of polycrystalline materials under uniaxial tensile loading. It is significantly faster than existing crystal plasticity methods and enables simulation of large volumes that would be otherwise computationally prohibitive. This approach surpasses existing ML-based modeling results by providing local 3D full-field predictions rather than just average values or being limited to 2D structures.
SCRIPTA MATERIALIA
(2021)
Article
Engineering, Mechanical
Ritesh Dadhich, Alankar Alankar
Summary: A FFT-based modular solver for crystal plasticity is proposed in this paper. It solves the balance of momentum in a global iterative loop and single crystal plasticity in an inner loop using an implicit time integration scheme. The response of single crystals is modeled by coupling slip system based constitutive equations to crystal kinematics. The solver is validated against experimental data and shows excellent agreement. The FFT solver is also used to analyze the deformation behavior of a dual phase polycrystal and exhibits good accuracy compared to an open-source finite element crystal plasticity solver.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
Lianyong Xu, Fangdong Bao, Lei Zhao, Yongdian Han, Hongyang Jing, Huajin Yu, Xueting Gong
Summary: This study investigated the relationship between microstructural evolution and low cycle fatigue behavior of 316H austenitic steel at the working temperature of generation-IV nuclear power plants. It was found that different strain amplitudes led to different expressions of cyclic softening behavior due to the evolution of dislocation structures, and dynamic recrystallization resulted in a decrease in dislocation density. A modified life prediction model based on plastic strain energy was proposed to predict the fatigue life of 316H steel.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Engineering, Mechanical
Wei Wang, Peitang Wei, Huaiju Liu, Caichao Zhu, Guanyu Deng, Heli Liu
Summary: We have developed a prediction system for the rolling contact fatigue (RCF) performance of martensitic steel based on machine learning algorithm and micro-mechanical simulations. This system not only provides a low-cost micromechanics-based prediction system, but also establishes the link between microstructure features and RCF responses. The prediction system uses a hierarchical microstructure modeling approach and a size-dependent physics-based crystal plasticity (CP) framework to capture the micromechanical response of martensitic steel in RCF.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Chemistry, Physical
Z. Y. You, Z. Y. Tang, F. B. Chu, L. Ma, G. F. Guan, H. Ding, R. D. K. Misra
Summary: This study systematically investigated the microstructure and mechanical properties of a tri-phase heterogeneous high-entropy alloy (HEA) under different thermo-mechanical processing. The HEA exhibited a hierarchical microstructure and showed varying mechanical properties depending on the recrystallized fraction. Multiple strengthening mechanisms were activated during deformation, leading to an increase in work hardening rate. The phase distribution and recrystallized grains morphology were characterized, providing insights into the synergy between strength and ductility in HEAs.
Article
Materials Science, Multidisciplinary
Berzah Yavuzyegit, Egemen Avcu, Albert D. Smith, Jack M. Donoghue, David Lunt, Joseph D. Robson, Timothy L. Burnett, Joao Quinta da Fonseca, Philip J. Withers
Summary: By coupling an improved speckle patterning method enabling high resolution digital image correlation (HRDIC) at nanoscale strain resolution with a scanning electron microscope allowing autonomous experimental control and image acquisition during in situ tensile straining, the plastic deformation in AZ31 Mg alloy at the grain scale to significant plastic strains has been mapped for the first time. The proposed methodologies have the potential to characterise the real-time deformation behaviour of a wide range of engineering alloys at the grain scale at room and elevated temperatures.
Article
Engineering, Mechanical
Li Ding, Chao Yu, Xu Zhang, Zefeng Wen, Qianhua Kan, Guozheng Kang
Summary: Experimental observations indicate that the torsional deformation of copper micro-wires is influenced by sample and grain size. In this study, a higher-order strain gradient constitutive model is developed based on the cyclic plastic J2 flow rule to explain the size effect in torsional deformation of copper micro-wires. A new kinematic hardening evolution rule is proposed considering the coupling effect of sample and grain sizes. Numerical implementation is accomplished using a finite element iterative algorithm, and the proposed model is validated using the finite element software ABAQUS. Simulation results show that the proposed model effectively captures the size-dependent torsional deformation of copper micro-wires. This research lays a solid foundation for the combination of strain gradient plasticity theory and cyclic plasticity constitutive model.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Aerospace
Yuhang Duan, Bo Zhang, Xu Zhang, Limin Zhang, Huoming Shen
Summary: In this study, the elastic buckling of skew thick microplates under combined in-plane shear and compressive loading is investigated within the framework of modified couple stress theory. A two-variable refined shear deformation theory is used to describe the displacement field of the microplates, resulting in a simple and universal elastic buckling model. An analytical buckling solution is challenging to obtain, so a C1-type four-node 32-DOF differential quadrature finite element is developed. Parametric studies are conducted to analyze the effects of different geometrical dimensions, boundary edges, in-plane loadings, and material length scale parameters. The results show that the buckling modes of skew microplates are influenced by the combination of size effects and skew angle.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Mechanics
Peilin Fu, Jizhong Zhao, Xu Zhang, Hongchen Miao, Zefeng Wen, Guozheng Kang, Qianhua Kan
Summary: A three-dimensional tractive rolling contact analysis is conducted on functionally graded coating-substrate systems. The surface frictional anisotropy is described by Coulomb's orthotropic friction law, and the discontinuous transmissions of stress and displacement at the coating-substrate interface are modeled by a coupled dislocation-like and force-like interfacial imperfection. A multi-layered model is used to simulate the coating with arbitrarily varying thermo-elastic properties, and numerical methods are employed to obtain the thermo-elastic responses of tractive rolling contact. The results show the effect of friction coefficients and interfacial imperfections on traction and stress distribution.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Ni Ao, Han Zhang, Huihui Xu, Shengchuan Wu, Dong Liu, Pingguang Xu, Yuhua Su, Qianhua Kan, Guozheng Kang
Summary: This study investigated the fatigue crack growth (FCG) behavior of a structurally gradient axle steel with different pre-crack depths in air and a corrosive medium. The results showed that corrosion significantly accelerated the FCG rate in the high Delta K region, but the effect weakened as Delta K decreased. The accelerated corrosion FCG rate was influenced by anodic dissolution, hydrogen-enhanced localized plasticity and corrosion-induced crack-tip blunting. Despite the decreasing corrosion resistance with increasing pre-crack depth, the FCG rate in the corrosive medium gradually decreased due to the dominant role of fatigue loading in accelerating corrosion FCG rate.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Xu Zhang, Yang Gui, Minjie Lai, Xiaochong Lu, Ji Gu, Feng Wang, Tao Yang, Zhangwei Wang, Min Song
Summary: The microstructures, mechanical properties, and deformation substructures of gradient Mo0.3NiCoCr medium-entropy alloys with very coarse grain size created by pre-torsion have been investigated. The strength of these alloys increases with the increase of torsion angle, while the tensile elongation remains the same, suggesting the enhanced strength-ductility synergy. The combination of experimental characterization and theoretical modeling enables to clarify the underlying strengthening and strain hardening mechanisms, providing guidance for optimizing the mechanical performance of structural materials via tuning the design of gradient structure.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Engineering, Mechanical
Ziyi Wang, Shengchuan Wu, Yu Lei, Hang Li, Chao Yu, Kun Zhou, Xiqiao Feng, Guozheng Kang
Summary: This paper presents a novel mesoscopic damage model to characterize the low-cycle fatigue damage evolution of an extruded AZ31 magnesium alloy, taking into account the effect of twinning. The damage caused by the slip bands-twin boundaries and slip bands-grain boundaries interactions is treated based on the Tanaka-Mura model and the Eshelby inclusion theory. The proposed damage model is able to reproduce the damage evolution processes and predict the crack initiation life within the twice error band.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Mechanics
Qianhua Kan, Yong Zhang, Yangguang Xu, Guozheng Kang, Chao Yu
Summary: The functional degeneration of super-elastic NiTi shape memory alloy (SMA) rods was investigated under cyclic tension-unloading and compression-unloading experiments. The results showed that the functional degeneration exhibited a strong tension-compression asymmetry, which was caused by the initial mixed textures, polarity of martensite transformation, and the interaction between martensite transformation and dislocation slipping. Furthermore, the dependence of functional degeneration on the applied stress level was discussed.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Weiyang Huang, Guozheng Kang, Pengyu Ma
Summary: The electro-mechanically coupled cyclic deformation of VHB 4905 dielectric elastomer is studied through experimental observation and constitutive modeling. It is found that applying a constant voltage leads to more apparent cyclic softening and ratchetting in VHB 4905 DE, indicating an electro-mechanically coupled effect. The deformation also exhibits rate-dependence and stress-level-dependence. A visco-hyperelastic constitutive model considering nonlinear viscosity and the effect of applied voltage is proposed and validated through comparison with experimental data.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Engineering, Mechanical
Yuehao Du, Jiangcheng Cai, Qianhua Kan, Qinghua Zhang, Ping Wang, Hongchen Miao, Guozheng Kang
Summary: In this study, a time-delayed layer-based piezoelectric transducer (TDLBPT) is developed for unidirectional generation and reception of pure SH0 wave. The TDLBPT can achieve a phase gradient over a wide range of frequencies, eliminating the need for additional time delays. Both simulated and experimental results demonstrate that the TDLBPT can generate pure SH0 wave and focus the wave energy along a given direction in a plate. Due to its excellent performance and easy fabrication, the proposed TDLBPT is highly useful for unidirectional excitation and reception of SH0 wave in SHM and NDT.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Jianfeng Zhao, Baoxi Liu, Yanfei Wang, Yanxiang Liang, Jicheng Li, Xu Zhang
Summary: Gradient nano-grained (GNG) metals exhibit superior strength-ductility synergy compared to homogeneous counterparts. This study develops a dislocation density-based strain gradient plasticity model coupled with a damage model to describe the strain hardening and softening behavior of GNG material. The results predict the tensile response of GNG nickel with varying degrees of grain size gradient, revealing that dispersed strain bands stabilize in the nano-grained surface layer and improve ductility. The method developed in this study enhances the understanding of strength-ductility synergy and optimization of microstructure gradient in GNG materials.
MECHANICS OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Shuxin Chang, Zhiwu Zhu, Guozheng Kang, Xingmin Huang, Juan Zhang
Summary: A phase field model combined with finite element method was used to simulate the ratchetting phenomenon of medium-manganese steel under asymmetric load and discuss the effect of martensitic transformation on ratchetting. The results showed that the ratchetting strain of the steel increased with increasing stress amplitude, mean stress, and stress ratio, and the martensite content increased with increasing stress amplitude but decreased with increasing mean stress and stress ratio. The plastic strain induced by martensitic transformation played a critical role in the overall ratchetting behavior.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Engineering, Mechanical
Songjiang Lu, Ni Ao, Qianhua Kan, Shengchuan Wu, Guozheng Kang, Xu Zhang
Summary: A three-dimensional discrete dislocation dynamics (DDD) method was used to study the effect of residual stress on the stress-strain response of gradient nano-grained (GNG) metals. The distribution of residual stress was found to have a significant influence on the tensile stress-strain curve. The presence of both compressive and tensile residual stress in GNG samples resulted in a lower initial flow stress but a higher ultimate flow stress compared to samples without residual stress.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Acoustics
Huijian Chen, Zhiqiang Feng, Ling Tao, Jian Li, Hongchen Miao, Guozheng Kang
Summary: Nonlinear ultrasonic techniques are effective in characterizing incipient defects of materials. In this study, a time domain spectral finite element method combined with the bi-potential contact theory is used to simulate contact acoustic nonlinearity (CAN) problems with prestresses. It is found that a primary shear horizontal (SH) wave can generate a second harmonic SH wave when there are tangential prestresses at the frictional interfaces or crack surfaces. This new phenomenon is explained by the asymmetric sliding mechanism induced by the tangential prestresses.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Materials Science, Multidisciplinary
Siyao Shuang, Yanxiang Liang, Xie Zhang, Fupin Yuan, Guozheng Kang, Xu Zhang
Summary: High-entropy alloys (HEAs) are considered ideal solid solutions of multi-principal elements, but recent studies have shown that complex interactions among constituents can lead to local chemical ordering at low temperatures. In this study, the impact of chemical ordering on the deformation behaviors of CuNiCoFe HEA was investigated through molecular dynamics simulations. The results reveal that chemical ordering leads to a softening in mechanical properties and a decrease in ultimate strength due to the nucleation of dislocations.
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
(2023)
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)
