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"Elastic analysis (Engineering)"
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Guided waves in structures for SHM
Understanding and analysing the complex phenomena related to elastic wave propagation has been the subject of intense research for many years and has enabled application in numerous fields of technology, including structural health monitoring (SHM).
eBook
Asymptotic methods for elastic structures : proceedings of the international conference, Lisbon, Portugal, October 4-8, 1993
Applied mathematicians and numerical analysts present 21 papers on the asymptotic analysis of lower order dimensional models used in elastic structures that are characterized geometrically by a small parameter, such as the thickness in plates and shells or the cross sectional area in rods. They provide an overview of current developments in the fie
eBook
Elastography
A comprehensive, easy-to-use guide on elastography from a Who's Who of international experts This practical guide is a compilation of firsthand expertise from leading authorities around the world on the use of ultrasound elastography. The stiffness or softness of the imaged tissue derived from elastography provides accurate radiologic diagnosis for disease processes including cancer, inflammation, and fibrosis. It is an efficacious and accurate diagnostic imaging modality that helps avoid invasive biopsies. The first two chapters cover basic fundamental principles of elastography, with subsequent chapters exploring pathology-specific utilization. The authors cover the extensively validated and implemented use of elastography for diffuse liver disease, and diseases of the breast andthyroid gland. They also discuss the potential benefits and limitations for the prostate, spleen, pancreas, kidneys, musculoskeletal system, salivary glands, lymph nodes, and testes. The book concludes with a chapter on potential future applications of this ever-evolving technology. Key Highlights * Discussion of key differences between strain elastography and shear wave elastography by individual organ systems * Clinical pearls on how to accurately perform elastography and tips for avoiding false-positive or false-negative results * Case studies elucidate the targeted use of elastographic findings by specific pathology * Illustrations in the breast and liver chapters demonstrate precise transducer techniques * MRI elastography as an emerging and safe assessment tool, primarily for the diagnosis of liver disease, with emergent potential for additional organs This book provides key knowledge on visualizing quantifiable differences in tissue elasticity and applying this data to improved treatment strategies for diverse pathologies. It is essential reading for radiologists, sonographers, and imaging technicians.
eBook
Stochastic finite element analysis of continuous elastic systems
Various analytical methods have been developed for the analysis of structures with stochastic material properties. However, they are either computationally-time-inefficient or applicable only to certain types of structures. As a versatile numerical approach, the finite element method (FEM) has been extended by many researchers to study structural problems with random material properties and is called the stochastic finite element method (SFEM). A three story three bay frame with stochastic material properties was analyzed by Deodatis (1990) using SFEM. An assumption that the material property of individual members of the frame was uncorrelated, was made in his paper. In this thesis, the technique used by Deodatis is extended to the analysis of a stochastic beam problem by incorporating material property correlation between elements. To validate the modified method, the present results are compared with those of Deodatis and Shinozuka (1989), who used another approach to solve the problem. The beam problem study showed that the modified SFEM was accurate and computationally-efficient, SFEM is further extended to the analysis for conical/cylindrical shells having random properties. The developed SFEM in this thesis is a combined application of standard FEM, Taylor series expansion and probabilistic theory to calculate the mean values of structural responses and to evaluate the response variations. Several numerical examples are considered. The results show the mechanism of structural responses to the stochastic material property under deterministic loading conditions.
Dissertation
Investigation of nonlinear elasticity and analysis of silo filling
A nonlinear elasticity model for granular material originally developed by Boyce (1980) has been studied thoroughly. The model is proved to be energy-conservative. Only three parameters are needed and they are easily obtained by conducting conventional tests. Direct definition of Poisson's ratio is avoided in the model, which is an advantage since it is not constant in nature. The tangential form of the stress-strain relations for the model is derived. This constitutive matrix is found to be symmetric. The model has been implemented into a research FE code named AFENA. Numerical problems encountered in the implementation are discussed and treated. Simple computer tests have been performed using both AFENA and small test programs. The results are in agreement. Parameter evaluation for the model is studied. Approaches to obtaining parameters for problems with different stress paths are suggested. The focus is on the silo filling problem. Using experimental data for loose sands from the literature, and comparing with published parameters, the magnitudes of the parameters are developed for loose sands. Parameters for other commonly used elastic models are also studied. (Abstract shortened by UMI.)
Dissertation