Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 285 for “"constitutive model"”.
-
Peridynamic constitutive model for concrete
… has several drawbacks including being limited to modeling materials with Poissons ratio of one-quarter. In 2007, Silling generalized his model by introducing state-based peridynamics. Sau et al. proposed a micropolar model for concrete in 2007, but were unable to fully implement the model. In …
-
Image-Based Geotechnical Constitutive Model Parameter Calibration
… through appropriately simplified mathematical models, commonly known as constitutive models. Conventional "element" tests (e.g. triaxial, simple shear) typically assume a homogeneous deformation response in a sample subject to externally applied stresses. While necessary due to current …
-
Cyclic Uniaxial Constitutive Model For Steel Reinforcement
… of steel reinforcement by means of appropriate constitutive models. Several uniaxial material models have been developed for reinforcing steel. Existing material models sacrifice efficiency for accuracy or vice versa. Conceptually simple and numerically efficient models do not accurately capture …
-
A unified constitutive model for clays and sands
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1994.
-
A continuum constitutive model for amorphous metallic materials
A finite-deformation, Coulomb-Mohr type constitutive theory for the elastic-viscoplastic response of pressure-sensitive and plastically-dilatant isotropic materials has been developed. The constitutive model has been implemented in a finite element program, and the numerical capability is used to …
-
A constitutive model for friction in metal-working
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1993.
-
A constitutive model for the compression behavior of Old Alluvium
… as a state variable. Upon load reversal, a model based on double layer theory is integrated to predict macroscopic volumetric expansion due to the swelling of the nontronitic clay fraction. This behavior is also linked to the Cation Exchange Capacity through the preconsolidation stress …
-
Formulation and Implementation of a Constitutive Model for Soft Rock
… was performed with the objectives to formulate a constitutive model which describes all aspects of chalk and soft rock mechanical behavior, develop and/or implement methods to integrate the equations which form the constitutive model, and to apply the model to finite element simulations of …
-
Enhancement of the Brick constitutive model to incorporate viscous soil behaviour
The Brick model is an advanced elasto-plastic constitutive model for soils and has become a recognised tool for modelling ground behaviour, following its implementation into the finite element program Safe. The model can reproduce many essential elements of soil behaviour, which is viewed from a …
-
A nonlinear viscoplastic double yield surface constitutive model for geologic materials
A new constitutive model is proposed to describe the stress-strain-time behaviour of clays and organic soils. This approach is based on the framework of overstress viscoplastic theory and can be applied to any elastoplastic (inviscid) model.The most innovative idea of the proposed model is the …
-
Development of a constitutive model for a heaving clay from Rosebank
… aim of this research project was to develop a constitutive model for an expansive clay which could be numerically implemented within the finite element method. A review of available literature on expansive clays showed that the heave strain that clay under an applied load will undergo can be …
-
An internal variable constitutive model for the hot working of metals
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1987.
-
A visco-plastic constitutive model for snow. Theoretical basis and numerical implementation
L'abstract è presente nell'allegato / the abstract is in the attachment
-
An Experimentally Generated Constitutive Model for Peak Stress (σ_peak) in Compression Samples
<p>The hot working behavior of AISI 1018 steel was studied by hot-compression deformation tests on the Gleeble 1500 thermo-mechanical simulator at true strain values of -0.143 and -0.405, true strain rate values of 0.01 and 0.1, and working temperatures of 900<sup>°</sup>C and 1000°C. The tests …
-
A three-dimensional constitutive model for the mechanical behavior of cervical tissue
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.
-
Constitutive model of aligned carbon nanotube/nafion nanocomposite ionic electroactive polymer actuators
… these novel materials. However, the material constitutive relations of the PNCs and tailoring of these is lagging. In this work, A-CNT and Nafion PNC electrodes are manufactured and investigated as the key active element in ionic-electroactive polymer (i- EAP) devices. i-EAP actuators are …
-
Visco-Elastic Nonlinear Constitutive Model for the Large Displacement Analysis of Multibody Systems.
Visco-Elastic Nonlinear Constitutive Model for the Large Displacement Analysis of Multibody Systems.
-
A new constitutive model for the finite element analysis of metal powder compaction
… final component. An important application of the modelling of metal powder compaction is the determination of the properties of the compacted preform as these affect the properties of the final sintered component. An uneven density distribution in the compacted preform, for example, can cause …
-
An energy-based constitutive model for the in-plane mechanical behavior of woven fabrics
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.
Page 1 of 15