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Showing 1 to 20 of 34 for “"Viscoplasticity"”.
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Elasto-viscoplasticity of isotropic porous metals
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1992.
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Polycrystalline elasto-viscoplasticity : application to B.C.C. metals
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Elasto-viscoplasticity of porous metals at elevated temperatures
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1992.
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Coupled Gradient Enhanced Damage - Viscoplasticity Model Using Phase Field Method
… damage model through phase field method and viscoplasticity in continuum scale is developed. It is shown that the recently proposed non local gradient type damage model through the phase field method can be coupled to a viscoplastic model to capture the inelastic behavior of the rate …
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Viscoplasticity and damage mechanics models for rate-dependent materials and their application to ice
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1997.
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Modeling and Simulation of Viscoplasticity, Recrystallization, and Softening of Alloyed Steel During Hot Rolling Process
… The objective of this study is to investigate viscoplasticity, dynamic recrystallization, and static softening of alloyed metal during hot rolling process. Gleeble hot compression tests were performed to provide experimental stress-strain curves at different temperatures and strain rates. An …
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A Space -Time Finite-Element Method for the Signorini Problem and for Viscoplasticity With Small Elastic Dilatations
We develop a space-time, finite-element analysis to simulate the indentation process accurately. The space-time nature of the code allows high degrees of time refinement in the region of interest immediately beneath the indenter, thus improving the computational efficiency of the simulation. The …
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Principios variacionales y soluciones numéricas en elasto-visco-plasticidad
… model is studied and it is shown how the viscoplasticity theory can be used not only to model this behavior but also to model plasticity as well as creep. The mixed-initial boundary value problem in elasto/viscoplasticity is presented for the case of quasi-static iso- thermal process and …
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Modelling of welding with various constitutive models for steel
… types of inelastic theories of continua: unified viscoplasticity based on dislocation density theory, unified viscoplasticity based on potential theory, and transformation induced plasticity have been chosen for quantitative investigation. Material models proposed by Anand, Estrin and Mecking, …
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Continuity in Rigid Viscoplastic Flow
… equation for the rotation field in rigid viscoplasticity. The continuity condition provides a theoretical basis for assumptions of co-rotation models of crystal plasticity.
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Analysis of metal matrix composite structures using a micromechanical constitutive theory
… matrix behavior is modeled by the unified viscoplasticity theory of Bodner and Partom. The laminate constitutive relations are incorporated into a first-order shear deformation plate theory. The resulting boundary value problem is solved by utilizing the finite element method. · …
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Modeling cycle and time dependent creep/relaxation effects on fatigue lives of notched members
… mechanical material response was modeled using viscoplasticity constitutive laws and Neuber’s rule eliminating the need for finite element modeling of uniaxially loaded notched members. However, the Nenber’s modeling may be used with any material constitutive law. The procedures for fatigue …
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Single-crystal plasticity at finite strains: a computational investigation of hardening relations
… system of equations that describe single-crystal viscoplasticity under finite strains. The second objective is to use the computer code that is developed to examine three hardening laws that have been proposed. The first is an isotropic hardening law. The second is a hardening law that is …
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Numerical simulation of friction welding processes: An arbitrary Lagrangian-Eulerian approach
… and implementation of a finite strain thermo-viscoplasticity solver with thermomechanical friction contact for numerical simulation of friction welding processes are described. A finite strain associative coupled thermoplasticity model is used, which is suited for the large deformations …
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Testing and modeling of the viscoplastic and fracture behavior of metallic foils used in lithium-ion batteries
… model and integrates these into a basic viscoplasticity framework that assumes the multiplicative decomposition of the equivalent stress into a strain and strain rate dependent contributions. The an isotropic fracture response is characterized for a strain rate of 10-3 /s using notched …
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A nonlinear viscoplastic double yield surface constitutive model for geologic materials
… based on two yield surfaces based on overstress viscoplasticity theory: one is quasi-instantaneous (for the fast part of plastic deformations) and the other is viscous (for the slow part of plastic deformations). This assumption permits the reliable simulation of the mechanical behaviour of a …
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ΜΗ ΓΡΑΜΜΙΚΑ ΠΡΟΒΛΗΜΑΤΑ ΛΕΠΤΟΤΟΙΧΩΝ ΔΙΑΤΟΜΩΝ
… WE MENTION, THE THEORY OF IDEAL PLASTICITY AND VISCOPLASTICITY, THE UNILATERAL CONTACT PROBLEMS OF A BODY WITH RIGID OR DEFORMABLE BODY, THE FRICTION PROBLEMS E.T.C. MOREOVER, SUCH PROBLEMS HAVE NOT BEEN FORMULATED ANDSTUDIED IN THE FRAMEWORK OF STRUCTURES INCLUDING THIN WALLED BEAMS, BUT ONLY …
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Viscoplastic Study of 3D Printed Carbon Fiber Composites
… at different temperatures and loads.</p> <p>The viscoplasticity model presented in this paper was able to get rough estimations of the creep response for the 3D printed carbon fiber with Onyx thermoplastic composite. The model seems to be more accurate at the lower temperatures for both stiff and …
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Microscopic characterization of macroscopic colloidal gel rheology
… how the elasticity, the viscoelasticity, and the viscoplasticity of the gel on macroscopic scales arise from the microscopic structure and dynamics of the gel network while addressing different stages of the system from its gelation to yield or fluidization. Our findings suggest ways to …
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The mechanical behaviour of soft clays under vibration loading from vehicle traffic
… the material parameters used in the present viscoplasticity model and the thermodynamic variables from rate process theory are discussed. The conclusions drawn from the vibrational slump test results as well as the careful examination of the constitutive model have been implemented in a …
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