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 149 for “"the finite element model"”.
-
Failure analysis of a 30kHz ultrasonic welding transducer
… is used across variety of industries to join together thermoplastic materials. During ultrasonic welding, high frequency mechanical vibrations and compressive pressure are applied to the plastic materials. This creates intermolecular friction within the plastic which raises the temperature high …
-
Elastic-plastic finite element modeling of long span composite joists with incomplete interaction
This thesis presents elastic-plastic finite element analyses of seven long span composite open-web steel joists. These analyses account for the incomplete interaction between the concrete slab and the steel joist by modeling the nonlinear behavior of the steel shear connectors. Experimental tests …
-
Development Of A Simplified Finite Element Approach For Frp Bridge Decks.
… typically use open steel grid decks due to the weight limitations. However, these decks present rideability, environmental, and maintenance problems, for they are typically less skid resistant than a solid riding surface, create loud noises, and allow debris to fall through the grids. …
-
Parametric modeling and analysis of structural bonded joints
A closed form model of a double lap bonded joint based on the Hart-Smith Model is considered. An extensional link is added to the inner adherend in order to minimize the magnitude of the shear distribution in the adhesive along the overlap length and equations are formulated for this new model. …
-
Probabilistic turbine blade thermal analysis of manufacturing variability and toleranced designs
Manufacturing variability is likely the primary cause of a large scatter in the life of gas turbine hot-section components. This research deals with schemes to improve robustness through tolerancing input parameters in ranges of the distributions which make non-conformances more likely. The need …
-
Actuator and sensor design and modeling for structural acoustic control
The use of a high-fidelity finite element model is investigated for the design and closed loop performance prediction of shaped and distributed sensors and actuators for structural acoustic control. Sensor and actuator design was found to be sensitive to nodeline discrepancies between the model and …
-
Experimental investigations of anchorage capacity of precast concrete bridge barrier for Performance Level 2
In the last twenty years, the design requirements of bridge barriers have changed with the aim of improving the safety of commuters on the bridge. A majority of precast concrete bridge barriers (PCBB) on highway bridges in British Columbia were designed and installed in accordance with the 1988 …
-
A numerical study of the response of blast loaded thin circular plates, with both clamped and integral boundary conditions
This report sets out the results of a numerical investigation into the response of thin circular plates subjected to impulsive loads, using the commercial finite element code ABAQUS. iv Previous theoretical and numerical predictions of plate response have assumed a fully constrained boundary …
-
Effective Prestress Evaluation of the Varina-Enon Bridge Using a Long-Term Monitoring System and Finite Element Model
The Varina-Enon Bridge is a cable-stayed, precast, segmental, post-tensioned box girder bridge located in Richmond, Virginia. Inspectors noticed flexural cracking in July of 2012 that prompted concerns regarding long-term prestress losses in the structure. Prestress losses could impact the future …
-
Finite Element Modeling of Plastic Pails when Interacting with Wooden Pallets
The physical supply chain relies on three components to transport products: the pallet, the package, and unit load stabilizers. The interactions between these three components can be investigated to understand the relationship between them to find potential optimization strategies. The relationship …
-
Quasi-Static Structural Analysis of an Experimental Aircraft Wing
… bending test. This report will discuss the loads present on the aircraft during straight level flight at a speed of 82 knots equivalent air speed. Flight load calculations are described along with the design of the whiffletree and mounting structures utilized for applying the distributed …
-
Nonlinear analysis of plane frames
The results obtained from the nonlinearly elastic, geometrically linear beam-column are almost identical to the results obtained by the method of Gurfinkel and Robinson [6] within the linear range of the stress-strain curve. When the displacements become large, the Gurfinkel and Robinson routine …
-
Finite element modeling of a refrigeration compressor for noise prediction applications
The study involves the development of a finite element model of a hermetic reciprocating compressor for noise prediction applications. Inherent difficulties in developing the finite element model of a complicated structure are discussed and appropriate modeling strategies are evolved. The …
-
OCTG Premium Threaded Connection 3D Parametric Finite Element Model
Full 360 degree 3D finite element models are the most complete representation of Oil Country Tubular Goods (OCTG) premium threaded connections. Full 3D models can represent helical threads and boundary conditions required to simulate make-up and service loading. A methodology is developed to create …
-
The mechanical design aspects of a small diameter vascular prosthesis
… vascular grafts is believed to be in part due to the compliance mismatch between the native artery and the implanted graft. Consequently, designers are examining the use of more compliant materials for their manufacture. Ether free polyurethanes are currently amongst the most popular materials for …
-
Effect of non-linear loading paths on sheet metal fracture : large strain in-plane compression followed by uniaxial tension
… high strength steel sheets are rapidly entering the transport industry, as their high strength to weight ratio helps improving fuel and costs efficiency. The early ductile fracture of these materials limits their formability and crash-worthiness. A phenomenological criterion to predict ductile …
-
Refined Evaluation of Effective Prestress in the Varina-Enon Bridge
The Varina-Enon Bridge is a cable-stayed, post-tensioned segmental box girder bridge in Richmond, Virginia. A large flexural crack was noted by inspectors in July 2012 which prompted a number of investigations into the current condition of the bridge. Particular focus has been put on prestress …
-
An Experimental and Analytical Investigation of Floor Vibrations
… regarding floor vibrations were studied during the process of this research. A basic literature review of previous work in the field of floor vibrations is presented along with a summary of the study. The first area of study involved a comparison of finite element models with field tests for a …
-
The implementation of a finite element computer code and associated pre- and postprocessor into AE4101 and AE4102 : (Flight Vehicle Structural Analysis I and II)
The objectives of the project described in this thesis were to: 1) provide the documentation that is needed for a Naval Postgraduate School student to use the general purpose finite element computer program called SAP IV, and 2) to make available, and prepare the users manual for, a pre-and …
-
The Investigation of Transverse Joints and Grouts on Full Depth Concrete Bridge Deck Panels
… on full depth concrete bridge deck panels. The joints were designed on a deck replacement project for a rural three span continuous steel girder bridge in Virginia. Two cast-in-place and four post-tensioned joints were designed and tested in cyclical loading. Each joint was tested on a full …
Page 1 of 8