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 41 for “"Finite strain"”.
-
Finite strain elastic-plastic deformation of glassy polymers
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1984.
-
Theoretical and numerical aspects of problems in finite-strain plasticity
… is focussed on application of the theory to finite-strain plasticity. Quasi-static initial-boundary-value problems involving large plastic deformations are considered. An incremental form of such problems arises from a discretisation in time. A variational form of the incremental …
-
A finite strain theory of elastoplasticity and its application to wave propagation
A constitutive theory of finite strain plasticity is developed by using the methods of convex analysis. The theory abstracts and extends the classical assumptions of a convex region of admissible stresses, and the normality law. The overall effects of plastic behaviour are contained in the theory …
-
Finite strain behavior of polyurea for a wide range of strain rates
… as its high toughness-to-density ratio and high strain rate-sensitivity, so its application is recently extended to structural purpose to form sandwich-type or multi-layered plates. Those structures can be used for retrofitting of military vehicles and historic buildings, absorbing energy during …
-
Biomechanics of the cerebrum at finite strain : a tissue and cell level study/
The present study addresses the large strain nonlinear mechanical response of the cerebral cortex at the macroscopic tissue level and at the microscopic cell level. Unconfined uniaxial compression tests were conducted in vitro on cortical samples of porcine brains. The tests consisted of …
-
A finite strain theory, and its application to the plane stress response of polyurethane
… problem of linear elasticity. However, the strain displacement relations are formulated in the Eulerian manner and the displacement gradients are not assumed to be small. In addition, a more general stress~strain relationship than the conventional Hookean form is assumed. The solution is …
-
Laboratory Self-Weight Consolidation Testing of Dredged Material Analyzed Using a One-Dimensional Finite Strain Consolidation Method
… are best determined using a one-dimensional finite strain consolidation theory. This method requires a complete relationship between void ratio and effective stress for all expected void ratios in a dredged layer, which can be determined from laboratory testing. The United States Army Corps …
-
A Study of Acoustic Velocity and Dielectric Permittivity Anisotropy in Relation to Finite Strain in Deformed Rock
… for comparing variations in total natural strain with variations in other physical parameters. A large fold structure at Penrhyn Quarry, Bethesda, North Wales, U.K. has been mapped and its three dimensional strain determined from natural indicators. The strain has subsequently been …
-
Development and preliminary numerical investigations of a dislocation density-based finite-strain rate-dependent elastoplasticity constitutive model
… investigations of a dislocation density-based finite-strain rate-dependent elastoplasticity constitutive model Finite-strain elastoplasticity constitutive models suitable for process-scale simulation are typically developed from empirical observations of phenomena of interest. Such models make …
-
Temperature and rate dependent finite strain behavior of poly(ethylene terephthalate) and poly(ethylene terephthalate)-glycol above the glass transition temperature
… lies in the fact that it crystallizes at large strains during warm deformation processing. The imparted crystallinity increases its stiffness and strength, improves its dimensional stability, and increases its density. The crystallization process and the stress-strain behavior above the glass …
-
Temperature, strain rate and strain state dependence of evolution of mechanical behavior and structure of poly(ethylene-terephthalate) with finite strain deformation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
-
Numerical simulation of friction welding processes: An arbitrary Lagrangian-Eulerian approach
The development 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 …
-
Kinematics and visualization of strain in three dimensions
A new computer program for strain visualization has been written. Given an upper triangular deformation tensor, which corresponds to homogeneous deformations where no shearing occurs in the z-direction (assuming a right-handed reference system), the program calculates and displays the strain …
-
Towards using seismic anisotropy to interpret ductile deformation in mafic lower crust
… of the relationship between seismic properties, finite strain and fabric orientation thus provides a useful tool in the remote sensing and interpretation of deformation in the lower crust. This thesis outlines a work-flow model by which the seismic properties of a single and representative lower …
-
Complex Crustal Stratification Within the Chugach Mountains, Southern Alaska
<p>Strain within the crust is accommodated along vertical gradients, but a general characterization is difficult given the heterogeneity of the earth's outermost layer. The western termination of the Chugach metamorphic complex in southern Alaska includes a uniquely well exposed crustal section …
-
The Structure of Stress-Strain Relations in Finite Elasto-Plasticity
The stress-strain behavior of time-independent elastic-plastic material is investigated for finite strain taking the stable range of response of thin-walled tubes as the starting point.
-
Structural framework of the Fries fault zone south of Riner, Virginia
… an analysis of the field relationships and finite strain patterns within the fault zone, and further relates these features to an interpretation of its structural framework. A geologic map of the fault zone is provided, in addition to more detailed lithologic descriptions within the text. …
-
On the Formulation of a Hybrid Discontinuous Galerkin Finite Element Method (DG-FEM) for Multi-layered Shell Structures
A high-order hybrid discontinuous Galerkin finite element method (DG-FEM) is developed for multi-layered curved panels having large deformation and finite strain. The kinematics of the multi-layered shells is presented at first. The Jacobian matrix and its determinant are also calculated. The weak …
-
Numerical Techniques for the Noninvasive Assessment of Material Properties and Stresses in Soft Biomaterials
<p>The noninvasive measurement of finite displacements and strains in biomaterials by magnetic resonance imaging (MRI) may be shown to enable mathematical estimates of stress distributions and material properties within structures of the body such as articular cartilage or the intervertebral disc. …
-
Parallel and vector algorithms in nonlinear structural dynamics using the finite element method
… displacements, or rotations, those requiring finite strain plasticity material models that couple geometric and material nonlinearities, and those demanding detailed geometric modeling. The finite element method based on a Total Lagrangian approach and performing an implicit solution of the …
Page 1 of 3