Article
Computer Science, Interdisciplinary Applications
K. Krabbenhoft, J. Krabbenhoft
Summary: A simplified kinematic hardening plasticity framework for constitutive modeling of soils is proposed, where yield surfaces are used to compute effective hardening modulus for efficient numerical implementation. The framework is detailed for total and effective stress analysis, and illustrated with a simple model for undrained total stress analysis of clays.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Materials Science, Multidisciplinary
Knut Andreas Meyer, Johan Ahlstrom
Summary: In this paper, the authors analyze the assumption of the dependence of yield surface evolution on accumulated plasticity in cyclic plasticity models. Through carefully designed experiments, they measure the scalar variable and track the yield surface evolution, finding that this variable is insufficient to describe isotropic or distortional hardening of the investigated steel, thus invalidating the commonly used assumption. The results highlight the need for developing and verifying new isotropic and distortional hardening laws.
MECHANICS OF MATERIALS
(2023)
Article
Engineering, Geological
Yuki Yamakawa, Koichi Hashiguchi, Tomohiro Sasaki, Masaki Higuchi, Kiyoshi Sato, Tadashi Kawai, Tomohiro Machishima, Takuya Iguchi
Summary: This study developed an anisotropic elastoplastic constitutive model for geomaterials at finite strain and verified its basic characteristics and predictive capability through numerical examples.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2021)
Article
Engineering, Geological
Jianjun Ma, Junwei Guan, Yilin Gui, Linchong Huang
Summary: An anisotropic plasticity model has been developed to describe the nonisotropic mechanical behaviors of porous media, which has been validated through stress-strain responses modeling under various loading conditions. The model demonstrates good agreement with experimental results, showcasing its capability in capturing the complex behavior of porous media.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2021)
Article
Instruments & Instrumentation
Cheng Yang, Dayi Zhang, Fabrizio Scarpa, Qicheng Zhang, He Sun, Xiaoyong Zhang
Summary: This paper presents a phenomenological model for shape memory alloys based on classical plasticity theory. The proposed model combines the Souza constitutive approach with kinematic hardening, which improves computational efficiency. Additionally, the model incorporates an odd polynomial function to describe phase transformation and uses fewer parameters for inverse identification. The tangent stiffness formulation derived here enhances convergence and accurately simulates the elastic modulus variation during phase transformation.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Mechanics
Kai Zhang, Hao Li, Jianlin Liu
Summary: A plasticity model fully coupled with isotropic damage for Mg alloys is proposed in this study, accurately reproducing the stress-strain evolution under different loading conditions. The model takes into account the influence of distortional hardening, correctly capturing the initial anisotropic behavior and subsequent yield surface distortion of Mg alloys, accurately predicting failure under complex loading paths.
ARCHIVE OF APPLIED MECHANICS
(2021)
Article
Engineering, Geological
Seyed Iman Moghadam, Ehsan Taheri, Morteza Ahmadi, Seyed Ali Ghoreishian Amiri
Summary: This paper presents a constitutive model that can simulate the monotonic and cyclic behavior of clay and sand in a unified framework. The model effectively captures the elastic-plastic behavior of the soil using the bounding surface concept, a new dilatancy relation, and a kinematic hardening rule. An implicit integration scheme is introduced to improve the accuracy and convergence of the model. Experimental data from the literature are used to verify the accuracy and performance of the model.
Article
Computer Science, Interdisciplinary Applications
Vahid Galavi
Summary: This paper presents an elasto-plastic constitutive model within a double hardening framework for predicting the mechanical behavior of sands under various stress and relative density conditions. The model's capability is demonstrated by simulating laboratory tests data of Karlsruhe sand for different loading conditions.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Materials Science, Multidisciplinary
GuangTao Xu, Bo Sun, YinKui Qiao, Gang Wang, MingHao Zhao
Summary: This study proposes an indentation method combined with finite element simulation to analyze the plastic parameters of the surface-modified layer (SML). Experimental results on 18CrNiMo7-6 alloy steel show that the hardening index and yield strength of SML decrease along the depth after heat treatment, which is consistent with tensile test results.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Multidisciplinary
Jan Stefan, Slavomir Parma, Rene Marek, Jiri Plesek, Constantin Ciocanel, Heidi Feigenbaum
Summary: This paper presents an experimental technique to evaluate the initial yield surfaces and study their evolution during plastic flow of metallic materials. The technique involves using thin-walled tubular specimens and a servo-hydraulic machine under various loading modes. Plastic flow onset is identified based on a small proof equivalent plastic strain, allowing for evaluation of both initial and evolved yield surfaces. Continuous and automated evaluation of elastic moduli and proof plastic strain is ensured through algorithms written in C# language, showing promising results in capturing the yield surfaces of conventional metallic materials.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Mechanical
Jie Yang, Zhen-Yu Yin
Summary: The purpose of this study is to develop a unified elastoplastic model that can describe the monotonic and cyclic behaviors of natural structured clay-structure and crushable sand-structure interfaces. The model is based on bounding surface plasticity and the critical state concept, and incorporates features such as a more general yield surface, degradation of bounding surface size, and grain breakage effect. Simulation schemes are established for interface shear tests under different conditions, and comparisons between experimental and numerical results validate the capability of the model to predict the behavior of these interfaces.
JOURNAL OF ENGINEERING MECHANICS
(2023)
Article
Engineering, Manufacturing
Dylan Agius, Chris Wallbrink, Kyriakos Kourousis
Summary: The design freedom provided by Additive Manufacture (AM) technologies is driving innovation in new directions, but also creating challenges in material characterisation. This paper proposes a model that combines anisotropic yield function with nonlinear multicomponent kinematic hardening rule to accurately simulate the anisotropic behavior of materials like Ti-6Al-4V alloy. The model's performance was evaluated through simulations and showed good agreement with experimental data, demonstrating its efficiency in modeling cyclic stress-strain evolution in different build orientations.
ADDITIVE MANUFACTURING
(2021)
Article
Geochemistry & Geophysics
Junkun Tan, Jiaqi Guo, Shifan Qiao, Changrui Dong, Ziyong Cai, Gang Wang
Summary: The research shows that under high stress, the shear behaviour between soil and structure can be fitted by a hyperbolic model, with influencing factors including normal stress, interface roughness, and moisture content.
Article
Engineering, Geological
Zhiwei Gao, Andrea Diambra
Summary: This study proposes a full anisotropic model for fibre-reinforced sand in multiaxial stress space, taking into account the influence of fibre orientation on FRS behavior. The model is based on the deformation of the sand skeleton, the effect of fibre presence on the soil skeleton, and the relative orientation between loading direction and fibre orientation, without requiring direct measurement of individual fibre stress-strain relationships.
Article
Engineering, Mechanical
Christopher P. P. Kohar, Waqas Muhammad, Kaan Inal, Y. Larry Li
Summary: The effect of precipitation on the mechanical properties of an artificially aged AA6061 alloy was investigated. The microstructure remained constant under different aging conditions. The artificial aging reduced the initial work hardening rate and increased kinematic hardening. A numerical through-process framework accurately predicted the alloy's behavior and was used to simulate precipitation hardening in single crystals.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Engineering, Geological
Ming Yang, Gaziz Seidalinov, Mandi Taiebat
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2019)
Article
Engineering, Geological
Andres Reyes, James Adinata, Mahdi Taiebat
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2019)
Article
Engineering, Geological
Andres R. Barrero, Mahdi Taiebat, Yannis F. Dafalias
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2020)
Article
Computer Science, Interdisciplinary Applications
Christoph Schmuedderich, Mohammad Mahdi Shahrabi, Mahdi Taiebat, Arash Alimardani Lavasan
COMPUTERS AND GEOTECHNICS
(2020)
Article
Engineering, Geological
Ming Yang, Mahdi Taiebat, Yannis F. Dafalias
Summary: The new constitutive model for sand incorporates two new ingredients for controlling plastic strains and pore pressure development, as well as simulating large shear strain development in the post-liquefaction stage. With a single set of constants, this model successfully simulates undrained cyclic tests with different stress ratios, contributing to potential applications in seismic site response analysis.
Article
Engineering, Geological
Andres Reyes, Ming Yang, Andres R. Barrero, Mahdi Taiebat
Summary: This study utilized laboratory and centrifuge tests to investigate the behavior of a sand slope subjected to base excitation through dynamic coupled analysis. By using a novel constitutive ingredient to model post-liquefaction large cyclic shear strains, the calibrated model showed improved performance compared to a reference model. The study revealed the capabilities and limitations of the models in simulating soil liquefaction strength and its post-liquefaction response.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Geological
Ming Yang, Mahdi Taiebat, Patrick Mutabaruka, Farhang Radjai
Summary: Using the three-dimensional discrete element method, the study investigates the long-term evolution towards liquefaction state in granular materials composed of spherical particles under multidirectional cyclic shearing. It is found that liquefaction resistance is generally lower under multidirectional loading compared to unidirectional loading, and a shear strain-based liquefaction criterion is proposed. The analysis includes monitoring granular texture through various parameters and observing the relationship between deviatoric stress ratio and force and fabric anisotropies.
Article
Engineering, Geological
J. Duque, M. Yang, W. Fuentes, D. Masin, M. Taiebat
Summary: The paper discusses seven characteristic limitations frequently observed in cyclic loading simulations of sands, including stress overshooting, one-way ratcheting in cyclic strain accumulation, and liquefaction strength curves. Four advanced constitutive models are analyzed for their specific limitations and capabilities in simulating essential aspects of cyclic loading of sands.
Article
Computer Science, Interdisciplinary Applications
Ming Yang, Mahdi Taiebat, Farhang Radjai
Summary: This paper investigates the evolution of internal structure during cyclic liquefaction of dense granular media through 3D-DEM simulations. The study reveals a fast transition to a fluid-like shear strain regime upon liquefaction, characterized by low shear modulus, decreasing dilatancy, and reduced shear viscosity. Various micro- and meso-scale descriptors are used to analyze the internal structure, and two possible criteria for exiting the fluid-like state based on excess pore pressure are discussed.
COMPUTERS AND GEOTECHNICS
(2022)
Editorial Material
Engineering, Geological
J. Duque, M. Yang, W. Fuentes, D. Masin, M. Taiebat
Article
Computer Science, Interdisciplinary Applications
Sounik Kumar Banerjee, Ming Yang, Mahdi Taiebat
Summary: Using the three-dimensional discrete element method, we investigated the impact of particle size distribution (PSD) on the cyclic liquefaction resistance of spherical particle assemblies. The coefficient of uniformity (Cu) was used as a descriptor for the PSD. Our simulations showed that the evolution pattern of excess pore pressure ratio against the number of loading cycles normalized by the number of cycles to liquefaction was minimally affected by Cu at each relative density (Dr). We also found that the liquefaction resistance varied with Cu depending on the Dr of the samples.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Geological
Keith Perez, Andres Reyes, Mahdi Taiebat
Summary: This study focuses on the dynamic system response of a liquefiable deposit retained by a sheet-pile wall, particularly the pre- and post-liquefaction stages of soil response. A newly developed constitutive model, SANISAND-MSf, is used to simulate the cyclic response of sands during these stages. The model incorporates the concepts of memory surface and semifluidized state and is validated using experimental tests. The study reveals the correlation between the amplitude of pre-liquefaction base acceleration and liquefaction triggering, as well as the correlation between the cumulative absolute velocity of post-liquefaction base acceleration and post-liquefaction displacements.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Physics, Fluids & Plasmas
Ming Yang, Mahdi Taiebat, Patrick Mutabaruka, Farhang Radjai
Summary: By conducting 3D particle dynamics simulations, this study analyzed the microstructure and liquefaction state of granular materials under constant volume cyclic shearing, revealing the periodic jamming-unjamming transition leading to liquefaction. The research found that liquefaction is characterized by partial collapse of force-bearing network, decrease in coordination number and nonrattler fraction, and broadening of contact force probability density function. Additionally, the study showed that jamming transition and contact network percolation threshold are independent of initial conditions, leading to high contact anisotropy and decreased friction mobilization upon unjamming.
Article
Engineering, Geological
Y. F. Dafalias, M. Taiebat, F. Rollo, A. Amorosi
GEOTECHNIQUE LETTERS
(2020)
Article
Physics, Fluids & Plasmas
Patrick Mutabaruka, Mandi Taiebat, Roland J-M Pellenq, Farhang Radjai