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.
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Showing 1 to 20 of 96 for “"Large-strain"”.
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Large strain flexural testing of thin composite laminates
… nonlinear constitutive behavior over the full large strain range common to deployable structures. Flexural behavior is characterized by the moment vs. curvature response therefore requiring a bending test. A special test fixture is developed to allow flexural testing of thin plates at large …
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Large-strain piezoelectric actuators using controlled structural buckling
… can be a useful mechanism for gaining extremely large displacement amplification, since a infinitesimal displacement in the axial direction of the beam may lead to a large deflection in the middle of the beam. This thesis presents a novel large-strain piezoelectric actuator exploiting the …
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Large strain time-dependent behavior of elastomeric materials
… interactions by amplification of the first strain invariant. In an effort to examine some of the assumptions that are common in the constitutive modeling of particle filled elastomers, a detailed series of micromechanical models were constructed using two- and three-dimensional finite …
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A large strain piezoelectric microactuator by folding assembly
In-plane amplification of thin film piezoelectric strain has been previously demonstrated using mechanical flexures fabricated at the micro scale. This new work presents a method by which that amplification can be increased, along with a method to reduce parasitic out of plane bending present in …
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Large strain deformation of PETG as processing temperatures
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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Large Strain Finite Element Analysis of Spinodal Shell Structures
… conch architectures were simulated up to 0.5 strain at relative densities between 0.001 and 0.01, in order to match the conditions of nanoindenter tests of the same structures. The simulations provided results close to the experiments in elastic stiffness and plateau stress. Each of the …
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Large strain deformation behavior of oriented triblock copolymer cylinders
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1997.
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Mechanics of large-strain deformation of particle-modified polymers
… thermostability, or porosity. The deformation to large strains of particle-modified thermoplastic polymers is investigated. Blends with rubber particles and blends with calcium carbonate particles are considered. A novel experimental technique is utilized to characterize the three-dimensional …
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Mechanics of the hysteretic large strain behavior of mussel byssus threads
… exhibit a remarkable ability to withstand very large resilient yet dissipative stretches (A > 4) without failing. These threads were dissected into separate regions: proximal (proximal to the mussel) and distal; the sections were then tested in tension in both monotonic and cyclic tests at …
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On large deformation and large strain elastic-plastic analysis of continua
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1983.
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Numerical modelling in large strain plasticity with application to tube collapse analysis
… proposed for the analysis of 2 or 3-dimensional large strain plasticity problems. A Finite Difference program, with 2-dimensional continuum elements and explicit time integration, has been developed and applied to model the axisymmetric crumpling of circular tubes. New types of mixed elements …
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A study of formulations for large strain elasto-plastic finite element analysis
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1989.
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Compliant, Large-Strain, and Self-Sensing Twisted String Actuators with Applications to Soft Robots
… suitable for actuating soft robots, compliant, large-strain, and self-sensing TSAs are developed and applied to various soft robots in this work. The design was realized by replacing conventional inelastic strings with compliant, thermally-activated, and conductive supercoiled polymer (SCP) …
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Assessment of shear modulus for granular soils, with small- to large-strain moduli correlations
… les mesures du module de cisaillement sur une large gamme de déformations de cisaillement nécessitent des d’appareils spécialisés. Dans la présente étude, des corrélations entre le Go et le module contraint de l’oedomètre (Moedo) à de grandes déformations ont été établies. Pour établir ces …
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Large strain computational modeling of high strain rate phenomena in perforating gun devices by Lagrangian/Eulerian FEM simulations
… thesis deals with the study and the analysis of large strain and high strain rate behavior of materials and components. Theoretical, experimental and computational aspects are taken into consideration. Particular reference is made to the modeling of metallic materials, although other kinds of …
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Effect of non-linear loading paths on sheet metal fracture : large strain in-plane compression followed by uniaxial tension
… measurements of the history of stress and strain state up to the onset of fracture. The phenomenon of localized necking occurs prior to ductile fracture in most types of loading of sheet metal. In order to measure the local state of stress and strain, a hybrid experimental and numerical …
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Application of image measurement and continuum mechanics to measuring the large-strain kinematic behaviour of prepared sugar cane and bagasse
… continuum mechanics to measurement of the large strain kinematic behaviour of prepared sugar cane and bagasse. A generic, standœalone software tool was created for measuring the twoœdimensional finite strains of solidœphase historic continua, via time series of digital images from filmed …
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Experimental Determination of the Non-linear, Large Strain Zonal Mechanical Properties of Cartilage for Use in Quasi-static Finite Element Model.
… at 250 frames/sec. The nonlinear tensile stress-strain relationship of the cartilage specimens from the three zones was approximated mathematically using Fung's exponential equation. It was found that the Fung's model did not provide an adequate fit to the stress-strain relationship of mid and …
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Rapid Measurement and Estimation of Saturated Hydraulic Conductivity of Mineral Slurries
Large strain consolidation (LSC) behaviour of mineral slurries regulates the performance of tailings management and reclamation plans. The hydraulic conductivity-void ratio relationship primarily influences this behaviour, dominating the long-term performance of fine-grained slurries with higher …
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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 …
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