Article
Materials Science, Multidisciplinary
Ingo Schmidt, Andreas Trondl, Torsten Kraft
Summary: This study analyzed the constitutive behavior of a granular material with deformable particles interacting through Coulomb friction using numerical homogenization techniques. It investigated the influence of friction coefficient, hardening behavior, and particle size distribution on stress responses, and paid particular attention to flow behavior under low stress triaxialities. Numerical results were discussed in relation to theoretical models.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Optics
Xiongfeng Hu, Shengguan Qu, Zengtao Chen, Peng Zhang, Zhiyuan Lu, Fuqiang Lai, Chenfeng Duan, Xiaoqiang Li
Summary: The effects of DLSH and USR on the material properties and rolling contact fatigue behaviors of 25CrNi2MoV steel were investigated. The results showed that the combination of DLSH and USR improved the surface quality, increased surface hardness, and obtained beneficial surface compressive residual stress. The rolling contact fatigue life of the treated samples was significantly increased compared to the untreated samples.
OPTICS AND LASER TECHNOLOGY
(2022)
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
Julia Leuthold, Eleni Gerolymatou, Theodoros Triantafyllidis
Summary: This paper evaluates the performance of a constitutive model for the hydro-mechanical behavior of soft rock and calibrates it using experimental results. An analytical model based on the Kozeny-Carman equation is proposed to describe the effect of compaction bands on the permeability of soft rocks and is discussed.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Yunteng Wang, Ronaldo I. Borja, Wei Wu
Summary: We propose a new phase-field formulation to model the formation and propagation of compaction bands in high-porosity rocks. This formulation takes into account the effects of inertia on the rate of development of compaction bands, as well as degradation mechanisms in tension, compression, and shear. We also present a robust numerical technique to handle the spatiotemporal formation and evolution of the compaction band, and validate the model using a benchmark problem involving a notched cylindrical specimen of Bentheim sandstone.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Engineering, Geological
Sabrina C. Y. Ip, Ronaldo Borja
Summary: In this study, a phase-field approach is proposed to capture the formation and propagation of compaction bands. By interpreting fracture energy as driven by grain crushing and introducing a new decomposition of the free energy function, the model accurately predicts different types of compaction bands. Numerical simulations also reveal the role of confining pressure, plasticity, and critical breakage energy on the styles of the predicted compaction bands.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Pharmacology & Pharmacy
Luca Palugan, Saliha Moutaharrik, Micol Cirilli, Andrea Gelain, Alessandra Maroni, Alice Melocchi, Lucia Zema, Anastasia Foppoli, Matteo Cerea
Summary: Dry granulation by roller compaction is a continuous manufacturing technology used in the pharmaceutical industry to improve bulk density and flowability of powder mixtures or prevent segregation issues. Mannitol, a commonly used excipient, can be successfully granulated using roller compaction, resulting in granules with proper size, increased bulk density, and adequate flow properties, which are suitable for tableting.
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
(2022)
Article
Pharmacology & Pharmacy
Shubhajit Paul, Yin -Chao Tseng
Summary: This study demonstrates the feasibility of quantifying average compressibility on non-flat faced toolings by investigating the central band portion and the entire volume of tablets. The research reveals that the yield stress is independent of powder type in the in-die condition, but varies widely in the out-die condition due to elastic recovery. The yield stress parameter correlates with the change in band volume of shaped tablets, providing an orthogonal approach to assess compressibility on non-flat faced toolings.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2023)
Article
Materials Science, Coatings & Films
Yichen Meng, Matteo Villa, Kristian Dahl, Bo Wang, Michel Drouet, Jean-Baptiste Dubois, Marcel A. J. Somers, Thomas L. Christiansen
Summary: This study investigated the surface hardening and heat treatment response of Ti-6Al-4V grades G5 and G23 under different temperature and gaseous conditions. Various surface treatments were applied, resulting in different hardness values and structure formations. The diversity of treatments in this work represents the potential of gaseous and plasma-based thermochemical methods for surface engineering of titanium alloys.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Adib Salandari-Rabori, Vahid Fallah
Summary: The deformation and evolution of shear bands in laser powder bed fused AlSi10Mg were studied using compression testing at different temperatures and strain rates. The work hardening behavior was correlated with microstructure and deformation mechanisms. Shear banding and different stages of work hardening were observed and their dependence on temperature and strain rate were evaluated. The findings provide insights into the compressive work hardening mechanisms of AlSi10Mg at different temperatures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Z. Q. Chen, M. C. Li, X. Tong, Y. Zhao, J. Y. Xie, S. W. Guo, P. Huang, F. Wang, H. B. Ke, B. A. Sun, W. H. Wang
Summary: This study captures and observes a nano shear band (NSB) structure in crystalline-layer confined amorphous (CLCA) alloy films, and finds that it enhances crystallization, hardening, and toughening effects. It provides new insights into understanding the microscopic deformation mechanism of amorphous alloys.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Automation & Control Systems
Jian Sun, Pengyang Li, Shen Zhang, Yunshuai Chen, Han Lu, Guoqing Chen, Ding Shao
Summary: This study successfully solves the machining challenges of GH4169 nickel-based high-temperature alloy and improves surface integrity through ultrasonic vibration-assisted milling. The effect of ultrasonic vibration on residual stress, surface hardening, and surface roughness is investigated.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Geosciences, Multidisciplinary
K. E. Elphick, A. Lv, H. Roshan, C. R. Sloss, K. Regenauer-Lieb, C. E. Schrank
Summary: The study found a positive correlation between strata-bound deformation bands and bedding thickness, with numerical simulations showing that the bands act as stress amplifiers explaining the observed spacing to thickness ratio (STR) much less than 1. Laboratory estimates and modeling results indicated that the existing cnoidal-wave model cannot account for the constant band spacing observed in layered porous sandstones.
JOURNAL OF STRUCTURAL GEOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Huizhen Wang, Yuewen Zhai, Leyu Zhou, Zibo Zhang
Summary: The study investigated the use of laser surface hardening on press brake dies, finding that it significantly increased hardness and improved microstructure uniformity.
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)
Editorial Material
Energy & Fuels
Joseph F. Labuz
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2021)
Article
Mechanics
Xiaoran Wang, Pouyan Asem, Chen Hu, Joseph F. Labuz
Summary: Acoustic emission and digital image correlation were used to monitor mode I fracture, revealing local mixed-mode dominance due to oblique microcrack planes within a tortuous fracture. Mechanisms in the global coordinate system mainly indicated mode I opening.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Geological
Pouyan Asem, Heloise Fuselier, Joseph F. Labuz
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Construction & Building Technology
Zhengjun Huang, Ying Zhang, Yuan Li, Dong Zhang, Tong Yang, Zhili Sui
Summary: Accurately obtaining the tensile strength of rock and understanding the evolution process of rock failure through different testing methods are key issues in rock mechanics theories and rock mass engineering applications. Experimental results show differences in tensile strength obtained from different test methods, but similar final failure modes are observed.
ADVANCES IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Zhili Sui, Zhaoguang Li, Yanhua Gao, Yuan Li, Yiwu Zheng, Yuan Meng
Summary: Soil-stone mixture is widely distributed in China, with complex physical and mechanical properties that significantly impact geotechnical engineering. True triaxial tests and a user-defined PMC numerical constitutive model for FLAC3D were developed to analyze strength properties. Results showed that strength of soil-stone mixture is affected by intermediate principal stress, requiring consideration of composite failure criteria and nonassociated flow rule based on the Mohr-Coulomb model.
ADVANCES IN CIVIL ENGINEERING
(2021)
Article
Engineering, Geological
Jian Liu, Yuan Li, Lan Qiao
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Energy & Fuels
Jinwei Fu, Joseph F. Labuz, Huixiang Cheng, Rongbin Hou, Weishen Zhu
Summary: A novel coupled model involving fluid pressure and mechanical damage is developed to study the failure process of rock specimens under seepage. The results show that the failure process under seepage is different from that under dry conditions, with significantly decreased compressive and residual strengths, and the specimen's volume expansion. Moreover, the results are well consistent with dry experiments, demonstrating the feasibility of the method.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Energy & Fuels
Jinwei Fu, Joseph F. Labuz, Mengdi Guo, Huixiang Cheng, Rongbin Hou
Summary: A new transparent resin material with a high compression-tension strength ratio has been developed, which can simulate various engineering rocks. Uniaxial and biaxial hydraulic fracturing experiments were conducted to analyze the effect of water injection on the mechanical properties of the specimens. The results were validated through numerical simulations, indicating the feasibility of the proposed method.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Geological
Ali Tarokh, Jacob D. Sharpe, Joseph F. Labuz
Summary: Experimental investigation of failure behavior of rock at low mean stress states reveals that a failure criterion incorporating tension cut-offs captures failure in this regime. The roughness of fracture surfaces varies with different failure modes.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Geological
A. Fakhimi, J. F. Labuz
Summary: Measuring the tensile strength of quasi-brittle materials such as rock proves to be a challenging task. However, a new apparatus has been introduced in this study that not only accurately measures the tensile strength but also provides information regarding the crack opening behavior.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Materials Science, Ceramics
Chen Hu, Joseph F. F. Labuz, Takaaki Koyanagi, Jia-Liang Le
Summary: Silicon carbide (SiC) fiber-reinforced SiC matrix (SiC/SiC) composites are being considered as potential materials for fuel claddings in light water reactors. This study presents a probabilistic model for the lifetime distribution of SiC/SiC composites, anchored by a multiaxial stress-based failure criterion and subcritical damage accumulation mechanism. The analysis demonstrates the importance of understanding the static fatigue behavior and length effect on the failure probability of the cladding.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Engineering, Geological
Pouyan Asem, Joseph F. Labuz
Summary: Laboratory experiments were conducted to measure the Skempton coefficient of Dunnville sandstone using small and large specimens. The pore volume of the small specimen was comparable to the system volume, while the pore volume of the large specimen was 100 times greater. The calculated Skempton coefficient using the appropriate poroelastic model and material parameters for Dunnville sandstone was found to agree with the measured coefficient.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Daniel V. Kennedy, Bojan B. Guzina, Joseph F. Labuz
Summary: Several hundred high mast light towers in Minnesota may have insufficient foundation capacity, requiring expensive retrofit or replacement. A non-destructive evaluation technique is proposed to determine in situ pile lengths using seismic waves and machine learning algorithms.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Mechanics
Caleb Widstrand, Chen Hu, Xiaoming Mao, Joseph Labuz, Stefano Gonella
Summary: Advances in topological mechanics have revealed the unique mechanical properties of Maxwell lattices, such as the ability to focus stress and protect against damage. This study provides an experimental exploration of using Maxwell lattices with non-ideal hinges for structural design. The experiments show that the lattice can withstand stress concentration and potential failure, demonstrating the effectiveness of the design approach.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Engineering, Chemical
Zhihao Jin, Weiche Chang, Yuan Li, Kezhong Wang, Dongjue Fan, Liang Zhao
Summary: This study proposes a microparameter calibration method based on Gaussian process (GP) response surface methodology, which addresses the issues of uncertainty, blindness, and repeatability in microparameter calibration. The study establishes a nonlinear response surface relationship between micro and macro parameters of rock materials. Experimental verification shows the accuracy of this method.