Article
Materials Science, Multidisciplinary
Jonathan M. Hestroffer, Jean-Charles Stinville, Marie-Agathe Charpagne, Matthew P. Miller, Tresa M. Pollock, Irene J. Beyerlein
Summary: This study investigates the incipient slip localization near hundreds of grain boundary triple junctions (TJs) in a lightly deformed nickel-base superalloy IN718 using a combination of three-dimensional (3D) crystal plasticity finite element modeling, high resolution digital image correlation, and 3D electron back-scatter diffraction tomography. The results show that TJs exhibit larger stress concentration and grain-average re-orientation compared to grain interiors and boundaries, but there are no substantial differences in cumulative slip among these microstructural regions.
Article
Mathematics, Interdisciplinary Applications
Humberto Breves Coda
Summary: Flory's decomposition is used to write hyperelastic constitutive models, but this study introduces it for plastic flow directions in elastoplastic models. The proposed total Lagrangian elastoplastic framework offers a simple implementation with good response.
COMPUTATIONAL MECHANICS
(2022)
Article
Chemistry, Multidisciplinary
Ozgur Aslan, Emin Bayraktar
Summary: This work presents analytical solutions for 2D model problems to demonstrate the unique plastic fields generated by the micromorphic approach for gradient plasticity. It also analyzes the constitutive behavior of the material undergoing plastic deformation. Additionally, the matching of analytical solutions with numerical results is demonstrated.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Multidisciplinary
K. E. N'souglo, K. Kowalczyk-Gajewska, M. Marvi-Mashhadi, J. A. Rodriguez-Martinez
Summary: In this paper, the effect of initial texture on multiple necking patterns in ductile metallic rings subjected to rapid radial expansion was investigated using finite element calculations. The material behavior was modeled using the elasto-viscoplastic single crystal constitutive model developed by Marin specialIntscript. The polycrystalline microstructure of the ring was generated using random Voronoi seeds. The results showed that the spatial distribution of grains, grain size, and initial texture have significant effects on the formation of necks.
MECHANICS OF MATERIALS
(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
Materials Science, Multidisciplinary
M. A. Charpagne, J. M. Hestroffer, A. T. Polonsky, M. P. Echlin, D. Texier, V. Valle, I. J. Beyerlein, T. M. Pollock, J. C. Stinville
Summary: This study investigates the slip localization behavior of the polycrystalline nickel base superalloy Inconel 718 during monotonic tensile loading at room temperature in relation to the 3D microstructure. Statistical analyses revealed strong correlations between slip band locations and specific microstructure configurations, with over half of the slip bands emanating from triple junction lines. Crystal plasticity finite elements calculations were performed on the experimental microstructure to identify the characteristics of slip activity in different microstructure regions.
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
Wei Jiang, Yinyin Li
Summary: This study investigates the effects of microstructure characteristics on the cumulative plastic slip (CPS) in the dominant slip system (DSS) at meso-scale and the J-integral at macro-scale using the combined crystal plasticity finite element method and variable-node finite element method. Experimental evidence shows that the grain size of the repaired layer is significantly smaller when an appropriate amount of nano tungsten carbide (WC) is added at the crack tip, leading to a greatly reduced J-integral in the repaired specimen. The addition of nano-WC during the laser repairing process serves to strengthen the material and refine the grain of the repaired layer, improving fracture properties.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Hyuk Jong Bong, Jinwoo Lee, Myoung-Gyu Lee
Summary: In this study, a multiscale model was developed to predict the cyclic loading behaviors of a wrought magnesium alloy. The model accounted for temperature dependency and introduced the concept of variable residual twin fraction. The accuracy of the model was validated by comparing with experimental data.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Engineering, Mechanical
Fengwei Sun, Shengxun Wang, Qingge Xie
Summary: The plastic deformation of aluminium alloy AA6061 under tension and compression was investigated using a strain gradient crystal plasticity model implemented with the finite element method. The research revealed the asymmetry of stress strain curves in loading of tension and compression, which is caused by lattice rotation and variation of dislocation density.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Engineering, Mechanical
Tsuyoshi Mayama, Sean R. Agnew, Koji Hagihara, Kentaro Kamura, Kazuma Shiraishi, Michiaki Yamasaki, Yoshihito Kawamura
Summary: The influence of alpha-Mg/LPSO phase interfaces on the flow stress of as-cast Mg-Zn-Y alloys was experimentally and numerically evaluated. The results showed that the flow stresses of Mg-Zn-Y alloys with LPSO phase fractions ranging from 40 to 85% were higher than those of single phase alpha-Mg or LPSO alloys. Comparison between Mg-Zn-Y alloys and Mg-Zn-Y-Zr alloys revealed that the flow stresses of Mg-Zn-Y alloys with LPSO phase fractions of 25 and 40% were insensitive to grain size, while the flow stress of alpha-Mg single-phase alloy showed clear grain size dependence. Crystal plasticity analysis successfully reproduced the observed stress-strain behavior, indicating that alpha-Mg/LPSO phase interfaces are effective obstacles against dislocation slip in two-phase Mg alloys containing LPSO phase.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Engineering, Mechanical
Akhil Vijay, Farshid Sadeghi
Summary: This paper presents a two-stage approach for modeling the initiation and propagation phases of rolling element bearing failures. By using crystal plasticity and cohesive elements, the method is able to simulate the initiation and growth of cracks, showing good correlation with experimental data.
TRIBOLOGY INTERNATIONAL
(2022)
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
Philip Crone, Peter Gudmundson, Jonas Faleskog
Summary: The influence of small, spherical, elastic particles dispersed within a matrix on macroscopic work hardening is studied. A proposed analytical solution based on an initial yield strength model is validated numerically and calibrated against experimental data.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Engineering, Mechanical
Umair Bin Asim, Zhiqiang Zhan, Miladin Radovic, Ankit Srivastava
Summary: This article presents a crystal plasticity constitutive relation for the description of non-Schmid crystallographic slip in MAX phases, and verifies the accuracy and reliability of the constitutive relation through finite element simulations.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Engineering, Multidisciplinary
Paola F. Antonietti, Gianmarco Manzini, Ilario Mazzieri, Hashem M. Mourad, Marco Verani
Summary: The study introduces the conforming virtual element method for numerical approximation of two-dimensional elastodynamics problem, proves stability and convergence of the method, and derives optimal error estimates under different refinements. Experimental results demonstrate the method's effectiveness on various computational meshes and show exponential convergence under p-refinement. Dispersion-dissipation analysis reveals that polygonal meshes exhibit similar properties to classical simplicial/quadrilateral grids.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2021)
Article
Mechanics
Lampros Svolos, Hashem M. Mourad, Curt A. Bronkhorst, Haim Waisman
Summary: Dynamic loads on metals can lead to brittle or ductile fracture, depending on strain rates, material properties, and specimen geometry. At high strain rates, ductile fracture may be preceded by shear bands, requiring reliable models to predict metal response. Anisotropic degradation of thermal conductivity across cracks can improve temperature and heat flux approximation compared to isotropic degradation.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Nanoscience & Nanotechnology
Marat Latypov, Jean-Charles Stinville, Jason R. Mayeur, Jonathan M. Hestroffer, Tresa M. Pollock, Irene J. Beyerlein
Summary: The study reveals that highly localized elastic strain concentrations in polycrystalline microstructures under monotonic loading depend on particular crystallographic and morphological orientations of grains, rather than on crystalline details of their local neighborhood. Annealing twin boundaries with specific topological and crystallographic features may increase the likelihood of slip band initiation throughout the microstructure of polycrystalline Ni-base superalloys.
SCRIPTA MATERIALIA
(2021)
Article
Engineering, Mechanical
Joseph Indeck, Gabriel Demeneghi, Jason Mayeur, Cyril Williams, Kavan Hazeli
Summary: The study focuses on the impact of reversible and non-reversible macroscopic elastic fatigue on the microstructure and subsequent mechanical properties of 7075-T6 aluminum alloy. Results show how different stress ratios and degrees of dislocation reversibility during high cycle fatigue loading influence the microstructure and post-fatigue global behavior of the alloy.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Nanoscience & Nanotechnology
Gabriel Demeneghi, Baxter Barnes, Paul Gradl, Jason R. Mayeur, Kavan Hazeli
Summary: This study investigates the size effects on microstructure and mechanical properties of Laser Powder Bed Fusion Copper-Chromium-Niobium Alloys. Results show that porosity is highly dependent on thickness, with an almost 75% decrease in as-built condition and a 99.7% decrease in HIP condition by increasing wall thickness. The increase in porosity has a notable effect on the mechanical properties, with yield strength and ultimate tensile strength decreasing by more than 20% as thickness decreases.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Mechanics
T. J. Nizolek, H. M. Mourad, C. Liu, J. A. Valdez, M. A. Torrez, G. T. Gray
Summary: This study investigated the effect of specimen geometry on simple shear deformation behavior, showing that a notch inclination angle of 45 degrees provides a substantial improvement in deformation behavior compared to a horizontally oriented notch. Finite element analysis was used to conduct a parametric study of the notch inclination angle.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Engineering, Mechanical
Marat I. Latypov, Jonathan M. Hestroffer, Jean-Charles Stinville, Jason R. Mayeur, Tresa M. Pollock, Irene J. Beyerlein
Summary: This study investigates the relationship between an intense slip band (ISB) and the zone of large lattice rotations, finding that ISB can lead to the formation of a severe lattice rotation region, known as a "microvolume," which requires a large amount of slip to enlarge its size and rotation magnitude. The results suggest that non-concentrated and spatially diffuse slip induced by ISB may result in the formation of detrimental ISB/microvolume pairs.
EXTREME MECHANICS LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Joseph Indeck, David Cereceda, Jason R. Mayeur, Kavan Hazeli
Summary: The use of machine learning techniques in mechanics and materials research can enhance the understanding of microstructure-property relationships. In this study, various machine learning techniques were employed to analyze mesoscopic deformation mechanisms and gain insights into void nucleation in polycrystalline metals. The results showed that unsupervised clustering analysis combined with a K-nearest neighbor classifier accurately characterized slip transmission and identified grains with fatigue-induced voids. It was also discovered that the inclusion of partially-active slip systems was more appropriate for predicting slip activity than the binary classification. The study concluded that grains containing fatigue-induced voids were more likely to be surrounded by grains with orientations that inhibited slip transmission according to the Lee Robertson-Birnbaum criteria. Furthermore, it was demonstrated that smaller datasets using limited simulation results could yield similar outcomes when additional physical descriptors for the slip system activity were incorporated.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Manufacturing
Behzad Bahrami Babamiri, Jason R. Mayeur, Kavan Hazeli
Summary: This article presents a methodical approach to optimize both microstructure and topology of additively manufactured metallic lattice structures (AMLS) in order to improve their mechanical properties. By calibrating crystal plasticity model parameters and considering different microstructures and topologies, the structural integrity of AMLS can be significantly enhanced.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Xiaolong Ma, Bharat Gwalani, Jinhui Tao, Mert Efe, Matthew Olszta, Miao Song, Sakshi Yadav, Anqi Yu, Thomas J. Nizolek, John S. Carpenter, Bo Zhou, Arun Devaraj, Suveen Mathaudhu, Aashish Rohatgi
Summary: Disentangling the contribution of intragranular and interfacial plasticity is crucial for understanding the overall strain accommodation in nanoscale materials. Researchers introduced shear strain gradients to Cu/Nb nanolaminates and found that intragranular slip dominates deformation in thick laminates, while it contributes significantly to plasticity in thin laminates. Additionally, forced chemical mixing was observed in the top region of the thin laminates.
Article
Materials Science, Multidisciplinary
Yifan Zhang, Jonathan G. Gigax, Thomas J. Nizolek, John S. Carpenter, Matthew M. Schneider, Nan Li, Laurent Capolungo, Rodney J. McCabe
Summary: Nano metallic laminates (NMLs) show exceptional strengths, but limited ductility under tension. By conducting mesoscale tension tests, it is found that annealing at 800 degrees C significantly enhances the ductility and work hardenability of NMLs.
Article
Materials Science, Multidisciplinary
Yifan Zhang, Nan Li, Matthew M. Schneider, Thomas J. Nizolek, Laurent Capolungo, Rodney J. McCabe
Summary: This study investigates the formation process and mechanism of kink band (KB) in Cu/Nb nano metallic laminates (NMLs). It is found that the inhomogeneous microstructure plays a key role in the formation of KB, leading to the accumulation of geometrically necessary dislocations (GNDs) and the formation of tilt geometrically necessary boundaries (GNBs) near KB boundaries (KBBs). Furthermore, once the layer-parallel slip systems are activated, preexisting lattice dislocations and dislocations nucleating from interfaces will accumulate as GNDs near KBBs, promoting the evolution of KB.
Article
Materials Science, Multidisciplinary
Yifan Zhang, Miroslav Zecevic, Aritra Chakraborty, Rodney J. McCabe, Thomas J. Nizolek, Ricardo A. Lebensohn, John S. Carpenter, Nan Li, Laurent Capolungo
Summary: This study investigates the dependence of kinking on microstructural attributes in NMLs through in situ micropillar compression, microstructure characterization, simulations, and modeling. The development of internal stresses during loading activates local layer-parallel glide triggering kinking in NMLs. The effect of key microstructural features on kink band formation in NMLs is also revealed.
Article
Materials Science, Multidisciplinary
Yinling Zhang, Nan Chen, Curt A. Bronkhorst, Hansohl Cho, Robert Argus
Summary: This paper presents a data-driven statistical reduced-order modeling framework for predicting the deformation process of porosity-based ductile damage in polycrystalline metallic materials, with uncertainty quantification. The framework computes the time evolution of the leading few moments of specific state variables from full-field polycrystal simulations and utilizes a sparse model identification algorithm to discover the governing equations. The predicted moments are then used to obtain an approximate solution of the time evolution of the probability density function (PDF) using the maximum entropy principle. Numerical experiments demonstrate the effectiveness of the model in characterizing the non-Gaussian PDF and quantifying extreme events.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)