Results 31 to 40 of about 5,371,238 (109)

A Reaction‐Cross‐Diffusion Formulation for the Evolution of Compaction Bands

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 3, March 2025.
Abstract We present a new thermodynamically consistent model for the time‐dependent evolution of compaction bands in porous rocks. The model extends a closed‐form analytical solution of compaction band formation for porous media into the time domain.
Qingpei Sun, Klaus Regenauer‐Lieb, Manman Hu   +2 more
wiley   +1 more source

A comparison between the Perzyna viscoplastic model and the consistency viscoplastic model

, 2020
The elastic-viscoplastic characteristics of the Perzyna model and the Consistency model are considered. Both theories are compared by assessing the evolution of the viscoplastic multiplier, the evolution of the internal variables and the loading ...
René De Borst, Otto M Heeres, Akke S J Suiker   +2 more
core  

On integration strategies for perzyna-type viscoplasticity, and application to zero-thickness interface elements [PDF]

, 2013
In this paper, Perzyna-type viscoplastic rate equations are integrated for a time step by considering the step as stress-driven. Depending on how the increment is imposed (constant, linear etc.), different strategies arise.
Carol, Ignacio, Aliguer Piferrer, Ignasi, Sture, S.   +2 more
core   +2 more sources

Numerical Investigation Into Mechanical Behavior of Metastable Olivine During Phase Transformation: Implications for Deep‐Focus Earthquakes

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 2, February 2025.
Abstract One hypothesized mechanism that triggers deep‐focus earthquakes in oceanic subducting slabs below ∼300 km depth is transformational faulting due to the olivine‐to‐spinel phase transition. This study uses finite element modeling to investigate phase transformation‐induced stress redistribution and material weakening in olivine.
S. Sindhusuta, Sheng‐Wei Chi, Craig Foster, Timothy Officer, Yanbin Wang   +4 more
wiley   +1 more source

The Applicability of Elastic/Viscoplastic Theory in Stress Wave Propagation

, 1975
A viscoplastic constitutive model developed by Perzyna to describe stress wave propagation in rate-dependent materials is examined. The model is considered in terms of dislocation concepts and its ability to provide results which agree with those ...
I. M. Fyfe
core   +1 more source

Efficient numerical integration of Perzyna viscoplasticity, with application to rock slope stability using zero-thickness interface elements [PDF]

, 2014
In this paper, Perzyna-type viscoplastic rate equations are integrated for a time step by considering the step as stress-driven. Depending on how the increment is imposed (constant, linear etc.), different strategies arise.
Carol, Ignacio, Aliguer Piferrer, Ignasi
core   +1 more source

Diffuse and localized failure predictions of Perzyna viscoplastic models for cohesive-frictional materials

, 2002
Viscoplastic constitutive formulations are characterized by instantaneous tangent operators which do no exhibit degradation from the elastic properties.
Etse, Jose Guillermo, Carosio, A.
core   +1 more source

Mixed Finite Element Solution of Quasi-Static Problems of Viscoplastic Plates

Engineering Transactions, 1980
The paper is concerned with the numerical analysis of rigid, viscoplastic and elastic viscoplastic plates subjected to static loading. The small deflection theory of thin plates is employed.
M.J. Mikkola, K. Saloviin
doaj  

A depth‐integrated SPH framework for slow landslides

International Journal for Numerical and Analytical Methods in Geomechanics, Volume 48, Issue 16, Page 3848-3875, November 2024.
Abstract Slow and very slow landslides can cause severe economic damage to structures. Due to their velocity of propagation, it is possible to take action such as programmed maintenance or evacuation of affected zones. Modeling is an important tool that allows scientists, engineers, and geologists to better understand their causes and predict their ...
Manuel Pastor, Andrei Hernández, Saeid M. Tayyebi, Gustavo A. Trejos, Ginés Suárez, Junwei Zheng   +5 more
wiley   +1 more source

Granular material regime transitions during high energy impacts of dry flowing masses: MPM simulations with a multi‐regime constitutive model

International Journal for Numerical and Analytical Methods in Geomechanics, Volume 48, Issue 15, Page 3699-3724, 25 October 2024.
Abstract The dynamic interaction between granular flowing masses and rigid obstacles is a complex phenomenon characterised by both large displacements and high strain rates. In case the flowing mass is modelled as a continuum, its numerical simulation requires both advanced computational tools and constitutive relationships capable of predicting the ...
Pietro Marveggio, Matteo Zerbi, Irene Redaelli, Claudio di Prisco   +3 more
wiley   +1 more source