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Showing 1 to 20 of 1892 for “"constitutive"”.
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Peridynamic constitutive model for concrete
… for a micropolar, lattice-based, and state-based constitutive model for the concrete. Example problems, including uniaxial tension, uniaxial compression, and confined compression are considered. Known features, including elasticity, damage, and fracture, of concrete appear to be well-replicated by …
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MACHINE LEARNING FOR CONSTITUTIVE MODELLING
… cost. These surrogate models provide the constitutive law of the micro scale simulations after a training process, called off-line learning. For history dependent materials, the recurrent neural network (RNN) is adopted for the training of path dependent mechanical responses, due to its …
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Constitutive modeling of active polymers
This thesis develops a three-dimensional constitutive model of active polymeric materials, including changes in material volume and properties due to actuation. Active polymers reversibly change shape, volume and/or material properties in response to some external stimulus. Electric fields are a …
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Constitutive relationships for agricultural soils
… triaxial tests were conducted to develop the constitutive relationships for two agricultural soils, which could be used for the finite element analysis of multipass effects of vehicles on soil compaction. Sandy-clay and sandy-silt samples were loaded and unloaded three times to levels of 138 …
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Constitutive modeling of glassy memory polymers
The aim of this research is to develop constitutive models for non-linear materials. Here, issues related for developing constitutive model for glassy shape memory polymers are addressed in detail. Shape memory polymers are novel material that can be easily formed into complex shapes, retaining …
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Extracting material constitutive parameters from scattering parameters
… complex permittivity and permeability. These constitutive parameters determine the response of the material to electromagnetic (EM) radiation. The precise knowledge of complex permittivity and permeability is required not only for scientific but also for industrial applications. Due to the …
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Constitutive Modeling of Friction in Bolted Connections
Bolted joints are ubiquitous in mechanical engineering, requiring accurate models to optimize designs. However, the exact nature of frictional contact between components is unknown and poses a significant challenge to modeling the nonlinear vibration of assemblies. This thesis applies empirical and …
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Constitutive behaviour of cement treated marine clay
Cement-soil stabilisation has been widely used to improve engineering performance of clayey soils in various applications. This thesis investigates the microstructure and macroscopic behaviour of laboratory prepared cement treated clay specimens that were cured under atmospheric, undrained and …
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The mathematical modelling of concrete constitutive relationships
… effects. These include the formulation of a constitutive model for the three-dimensional stress-strain relationships of concrete and the mathematical modelling of cracked and crushed concrete. The proposed models have been implemented into a finite element system for the analysis of …
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Image-Based Geotechnical Constitutive Model Parameter Calibration
… 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 measurement technique limitations, …
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A Class of Constitutive Relations for Solids
Made available in DSpace on 2014-12-04T23:11:06Z (GMT). No. of bitstreams: 1 6206234.pdf: 2137340 bytes, checksum: 03d6eb4d52eb73bd352321823450a204 (MD5) Previous issue date: 1962
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Numerical Constitutive Modelling for Continuum Mechanics Simulation
… dissertation, on the common theme of obtaining constitutive laws describing bulk properties of crystalline materials. We use ‘first-principles’ techniques where possible, an approach offering results which are predictive, with applicability to a wide class of materials, and with a systematic way …
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Polycrystal plasticity : constitutive modeling and deformation processing
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1992.
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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 …
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The constitutive modeling of shape memory alloys
… presents a one-dimensional thermomechanical constitutive model for shape memory alloys based on basic concepts of thermodynamics and phase transformation kinetics. Compared with other developed constitutive relations, this thermomechanical constitutive relation not only reflects the physical …
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Constitutive Overexpression of Acyloxyacyl Hydrolase in Mus Musculus
… in macrophages. CD68p-AOAH transgenic mice had constitutive overexpression of AOAH in macrophages, dendritic cells and tissues rich in these cells (liver, spleen and lung). They also secreted the enzyme into blood and deacylated LPS at a faster rate both in vitro and in vivo. Importantly, …
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Experimental investigation and constitutive modeling of marine clay
A new cross-anisotropic elasto-plastic constitutive model is developed based on experimental observations of marine clay from the Gulf of Mexico. Standard triaxial and torsional simple shear tests performed on the aforementioned clay demonstrate that the soil exhibits a cross-anisotropic behavior …
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Constitutive activity in orphan G protein coupled receptors
… to evaluate the extent of agonist independent constitutive signaling among orphan class-A G protein coupled receptors (GPCRs). These receptors translate extracellular signals via conformational change into intracellular activation of different G proteins and subsequent second messenger …
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