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 152 for “"Material Behavior"”.
-
Wood Material Behavior in Severe Environments
An improved knowledge of wood material behavior in hot-pressing environments can provide the benefit of an increased understanding of material properties during the manufacture of wood-based composites as well as insight into the development of new processes and products which manipulate the …
-
A method to predict transitions in material behavior
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
-
Modeling nonlinear material behavior at the nano and macro scales
… nonlinear effects in the mechanical response of materials at the nano and macro scales. These methods include, acoustoelastic theory, molecular dynamics and finite element models. The nonlinear indentation response of Ni thin films of thicknesses in the nano scale was studied using molecular …
-
The Strain Gradient Effect on Material Behavior at the Micron and Submicron Scales
Finally, we focus our interest on a MEMS structure---digital micromirror device (DMD) and find that the strain gradient effect significantly increases the mechanical strain energy in the DMD and reduces the rotation time of the micromirror.
-
The influence of time-dependent material behavior on the response of sandwich beams
To study the influence of the time-dependent behavior of various materials being considered for use in orbiting precision segmented reflectors, simple sandwich beam models are developed. The beam models included layers representing face sheets, core and adhesive. The issue of time-dependency is …
-
Modelling material behavior for additively manufactured metals and polymers produced by fused filament fabrication
… an anisotropic stiffness matrix with material constants obtained through experimental methods.
-
High-Velocity Microparticle Impact for Analytical Modelling of High-Strain-Rate Mechanics and Material Behavior
… micron-scale impacts against various materials is the focus of this work. This technique, the laser-induced particle impact test (LIPIT), is capable of accelerating microparticles to supersonic velocities to achieve strain-rates up to 108 s-1. The platform also provides in situ …
-
Effect of print orientation on mechanical material behavior in fused deposition modeling 3-D printing
… layer-based processes, resulting in anisotropic material behavior of the printed object. Thus, the print orientation of the object is a crucial factor in its mechanical properties, such as strength and elastic modulus. While anisotropy in 3-D printing has been extensively studied, a gap in …
-
An Approximate Finite-Element Method of Stress Analysis of Non-Axisymmetric Bodies With Elastic-Plastic Material Behavior
Made available in DSpace on 2014-12-14T04:42:05Z (GMT). No. of bitstreams: 1 8004169.pdf: 3939092 bytes, checksum: c62798484346ea9cbe97d14c33327385 (MD5) Previous issue date: 1979
-
Material feedback in digital design tools
How do design tools feedback material behavior to the designer? Digital design tools in use by designers today provide a rich environment for design of form but offer little feedback of the material that ultimately realize that form. This lack of materialism limits the value of the design tool and …
-
Dynamic simulation of heart mitral valve with transversely isotropic material model
… simulating, in the finite element setting, the material behavior of heart mitral valve leaflet tissue. First, a mixed pressure-displacement formulation is used to implement the constitutive material behavior with general 3D elements. Second, a shell is formulated that incorporates the 3D …
-
Finite Element Analysis of Nonlinear Consolidation
… saturated soils. Two sources of nonlinear material behavior are identified. The nonlinear material behavior under fully drained condition is represented by an elasto-plastic material model formulated in terms of effective stresses. For partially saturated soils, a constitutive model is …
-
Field Calibration of Time-Dependent Behavior in Segmental Bridges Using Self -Learning Simulation
… It can be applied to characterize any material behavior, including the time-dependent behavior of concrete in segmental bridges. The study presents a scheme to improve the camber of segmental bridges using a self-learning simulation.
-
Enhanced Nonlinear Truss Model for Capturing Combined Earthquake and Fire Effects in RC Structures
… simulation tools that can accurately capture material behavior during cyclic loading and at elevated temperatures. Ideally, simulation tools must also be conceptually simple and computationally efficient to allow extensive parametric analyses. The goal of the present study is to enhance a …
-
Experimental determination of stress intensities and crack shapes associated with the nozzle corner crack problem
… same problem. A discussion of the variational material behavior around the flaw border is also included. The applicability of the current method to the prediction of fatigue crack shapes is also discussed.
-
Análise do comportamento de um rejeito de minério de ferro no estado do regime permanente
… the specimens and evaluatingits influenceon the material behavior. To analyse the instability/liquefactionbehavior ofthis iron tailing when subjected to a monotonic undrainedload, the collapse line and the state parameter, and therelationship between the undrained brittlenessindex and the state …
-
Exploration of the Application of Machine Learning to the Improvement of Interatomic Potentials
Current methods for atomistic simulations of material systems suffer from limitations which restrict the ability of the simulations to correctly characterize certain material behavior and physical phenomena. Small scale ab initio molecular dynamics (AIMD) modeling is highly accurate but is …
-
Non-linear dynamic modeling using component mode synthesis
… technique for problems with geometric or material non-linearity. In this dissertation, a framework is developed to couple non-linear material behavior with a fixed interface CMS technique. This new approach allows non-linear material behavior, such as plastic deformation, to be …
-
Theorie und Numerik einer oberflächenorientierten Schalenformulierung
… model for the simulation of the load-bearing behavior of a strengthening layer made of textile reinforced concrete to strengthen a shell structure. The main focus lies on both the geometrical and physical non-linear three-dimensional shell formulation and on its transfer into an efficient …
Page 1 of 8