Article
Geochemistry & Geophysics
Uchitha N. Arachchige, Alexander R. Cruden, Roberto Weinberg
Summary: The study demonstrates that Laponite RD (LRD) gels undergo a transition from brittle, elastic-dominant linear viscoelastic material to plastic material under increased shear strain. LRD can be used to model both elastic deformation and plastic deformation, making it an ideal material for studying the behavior of rocks during magma emplacement and brittle fracture propagation in the upper crust.
Article
Geochemistry & Geophysics
Luca Dal Zilio, Betti Hegyi, Whitney Behr, Taras Gerya
Summary: This study presents a newly-developed numerical framework, H-MEC, to simulate the evolution of crustal stress and fluid pressure during the earthquake cycle. The model incorporates the coupling between solid rock deformation and fluid flow, and accounts for dynamic wave-mediated dynamics and fluid flow. The findings highlight the importance of pore-fluid pressure conditions and compressibility in controlling fault slip.
Article
Engineering, Aerospace
Yasutaka Satou, Hiroshi Furuya, Shoko Kaida, Tomoyuki Miyashita
Summary: This paper addresses the accurate prediction of the releasing and deploying behaviors of a creased space membrane. Experimental and finite element analysis results indicate that the opening angle of the crease increases with elapsed time after release due to stress relaxation. An analytical model is proposed to predict the releasing behavior, which shows good agreement with experimental results. Viscosity is considered important in predicting the releasing behavior of the space membrane.
Article
Engineering, Civil
Nicolas Jacquet, Nicolas Tardif, Thomas Elguedj, Christophe Garnier
Summary: This study investigates the elasto-visco-plastic buckling of thick plate structures through a modeling/experimental approach. There is a good correlation observed between numerical results and experiments.
THIN-WALLED STRUCTURES
(2021)
Article
Geochemistry & Geophysics
Uddalak Biswas, Atin Kumar Mitra, Nibir Mandal
Summary: This study investigates the mechanism of igneous dike intrusion using a combination of experimental and field observations. The experiments reveal three principal liquid pathway mechanisms and a wide variation in intrusion geometry. The results also show that volumetric flow rates and viscosity ratios significantly influence the evolution of intrusion geometry.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Mechanics
Nicolas Jacquet, Nicolas Tardif, Thomas Elguedj, Christophe Garnier
Summary: The buckling of thick elasto-visco-plastic hemi-egg shells is studied in this work using a modelling/experimental approach. It is found that the buckling behavior is influenced by the rate dependence of the material under non-proportional load paths. A buckling prediction model is used to accurately predict the buckling of the hemi-egg shells, and good agreement is observed between numerical results and experiments.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Mechanics
Qianyu Shi, Hongjun Yu, Licheng Guo, Liulei Hao, Kai Huang
Summary: A new plastic phase-field model is proposed in this study, which can better predict crack propagation and patterns in compressive stress states for elastoplastic materials compared to the conventional model.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Marine
Xin Bao, Jing-bo Liu, Shu-tao Li, Fei Wang
Summary: In this study, a visco-elastoplastic dynamic constitutive model and subroutine for coral sand material were developed to investigate the nonlinear seismic response of the reef-coral sand site in the South China Sea. The Matasovic skeleton curve and derived hysteretic curve were refined by introducing a critical shear modulus. Hysteresis criteria under irregular cyclic loads were established based on the improved Masing criteria. The study found that the coral sand layer significantly increases the site seismic responses, posing a threat to the seismic safety of buildings and constructions in the area. Moreover, the deformation of the reef-coral sand site tends to be concentrated on one side, resulting in residual displacement after earthquakes.
Article
Engineering, Mechanical
P. Lecostey, G. Gomit, S. Jarny, L. Thomas
Summary: An experimental method is presented to study the response of a synthetic mud bed under turbulent flow. The interaction between the turbulent flow and the visco-elasto-plastic bed is considered similar to the studies on compliant walls. The synthetic mud material with rheological properties similar to natural mud is studied using particle image velocimetry and adapted planar laser induced fluorescence in a channel. The analysis focuses on the onset of bed motion, surface deformations, and correlation with flow fluctuations.
EXPERIMENTS IN FLUIDS
(2023)
Article
Mechanics
Matthew Armstrong, Mathias Scully, Michael Clark, Trevor Corrigan, Corey James
Summary: The study demonstrates improvements to a simple elastic-viscous-plastic rheological model by incorporating a thixotropic term for modeling rheological flow of human blood. The enhanced model shows better accuracy compared to peer models, with evaluation based on the number of model parameters.
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2021)
Article
Engineering, Mechanical
Youngung Jeong, Bohye Jeon, Carlos N. Tome
Summary: The Delta EVPSC model is a general elasto-visco-plastic self-consistent constitutive formalism based on a Homogeneous Effective Medium (HEM) approach. By introducing an intermediate linearization scheme, it achieves more accurate predictions of intergranular stress and strain distributions in polycrystals. The Delta EVPSC-FE model offers superior numerical stability and reduced computation time, making it suitable for finite element analyses of metallic materials.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Geochemistry & Geophysics
D. W. Rees Jones, H. Zhang, R. F. Katz
Summary: Channels at mid-ocean ridges are believed to form through shear flow of partially molten mantle and reactive flow of ascending magma, with their competition being controlled by the orientation of channels with respect to gravity and mantle shear. The addition of horizontal extension favors tabular channel morphology. Reactive flow is dominant deep beneath the ridge axis, while shear-driven instability is confined to the margins of the melting region.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geosciences, Multidisciplinary
Yangming Wu, Jie Liao, Jiarong Qing, Yongqiang Shen
Summary: The study investigates the development of subduction in the tectonic setting where mid-ocean ridges and passive continental margins are juxtaposed using a 2-D numerical model. The results reveal three types of oceanic plate subduction: continental margin subduction, ridge-inversed subduction, and a transitional type with double subduction along ridges and margins. The physical parameters that influence the formation of these subduction types are systematically analyzed. The study emphasizes the significance of preexisting weakness along passive margins in promoting subduction development.
Article
Geochemistry & Geophysics
Alessio Sanfilippo, Vincent J. M. Salters, Sergey Y. Sokolov, Alexander A. Peyve, Andreas Stracke
Summary: The upper mantle is a mixture of refractory and recycled crustal domains, with the recycled portions dominating the composition of surface basalts. Hf isotope ratios may provide hints for melting of refractory source materials in basalts, allowing the identification of depleted mantle materials. Basalts from the Arctic Atlantic show high Hf isotope ratios, suggesting a highly depleted asthenospheric mantle source beneath this region.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geochemistry & Geophysics
Hongda Hao, Ian H. Campbell, Richard J. Arculus, Michael R. Perfit
Summary: The study reveals that most primitive mid-ocean ridge basalts have low platinum-group element content, which may be due to changes in sulfur saturation during ascent from the mantle to the ridge magma chamber. Sulfide saturation status can be determined by changes in Pd content, and frequent small replenishments in the magma chamber help maintain sulfide saturation status.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)