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- Aluminum and copper (1)
- Critical buckling loads (1)
- Euler beam-column (1)
- FE modeling (1)
- Finite element model (1)
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- Fire safety, CFD, lumped capacitance, insulation (1)
- Forward extrusion (1)
- Generalized ellipses (1)
- Geometric size effects (1)
- Hemispherical-cup-forming experiment (1)
- Metal forming (1)
- Non-homogeneous (1)
- Nonlinear mechanics (1)
- Periodic behavior (1)
- Ramberg-Osgood (1)
- Size effects (1)
- Small scale (1)
- Stereolithography punch/die (1)
Articles 1 - 4 of 4
Full-Text Articles in Engineering
General Nonlinear-Material Elasticity In Classical One-Dimensional Solid Mechanics, Ronald Joseph Giardina Jr
General Nonlinear-Material Elasticity In Classical One-Dimensional Solid Mechanics, Ronald Joseph Giardina Jr
University of New Orleans Theses and Dissertations
We will create a class of generalized ellipses and explore their ability to define a distance on a space and generate continuous, periodic functions. Connections between these continuous, periodic functions and the generalizations of trigonometric functions known in the literature shall be established along with connections between these generalized ellipses and some spectrahedral projections onto the plane, more specifically the well-known multifocal ellipses. The superellipse, or Lam\'{e} curve, will be a special case of the generalized ellipse. Applications of these generalized ellipses shall be explored with regards to some one-dimensional systems of classical mechanics. We will adopt the Ramberg-Osgood relation …
Size Effects In Small Scale Forward Extrusion And Metal Forming, Debabrata Mondal
Size Effects In Small Scale Forward Extrusion And Metal Forming, Debabrata Mondal
University of New Orleans Theses and Dissertations
Size effects play a significant role in metal processing when the specimen dimensions are reduced. In this study, influence of size effects were investigated on two problem specific processes. First, numerical simulations of a small-scale forward extrusion with varying grain size were performed for both 2D and 3D cases. Here, grains were assigned to non-homogeneous properties in a random fashion. The computational geometry was obtained from Voronoi tessellation in MATLAB, and python-scripting in ABAQUS. Then the effects of size and property non-homogeneity were investigated. Second, a numerical model was simulated to predict final form shapes, punch load requirement, and thickness …
Development Of Experimental And Finite Element Models To Show Size Effects In The Forming Of Thin Sheet Metals, Jeffrey D. Morris
Development Of Experimental And Finite Element Models To Show Size Effects In The Forming Of Thin Sheet Metals, Jeffrey D. Morris
University of New Orleans Theses and Dissertations
Abstract
An experimental method was developed that demonstrated the size effects in forming thin sheet metals, and a finite element model was developed to predict the effects demonstrated by the experiment. A universal testing machine (UTM) was used to form aluminum and copper of varying thicknesses (less than 1mm) into a hemispherical dome. A stereolithography additive manufacturing technology was used to fabricate the punch and die from a UV curing resin. There was agreement between the experimental and numerical models. The results showed that geometric size effects were significant for both materials, and these effects increased as the thickness of …
Modeling The Effect Of A Compartment Fire On Spaces Adjacent To A Bulkhead With And Without Attachments, Carl E. Hendrickson Ii
Modeling The Effect Of A Compartment Fire On Spaces Adjacent To A Bulkhead With And Without Attachments, Carl E. Hendrickson Ii
University of New Orleans Theses and Dissertations
Structural fire protection is an integral component of shipboard fire safety. There are national and international regulations that delineate requirements for the insulation placed throughout ships. The attachments that penetrate the insulation for hanging wires and pipes can disrupt the integrity of the division, and cause a failure to adhere to the regulations. This problem will be analyzed by using a simplified lumped capacitance model and ANSYS FLUENT CFD. A standard time-temperature fire curve is applied to the fire side of the enclosure. The thermal conductivity of the insulation and steel are made to be temperature dependent. The density of …