Mechanical Structure-Property Relationships of Microcellular, Low Density Foams.

1990 ◽  
Vol 207 ◽  
Author(s):  
James D. Lemay
Keyword(s):  
Mechanical Properties ◽  
High Energy Physics ◽  
High Energy ◽  
Department Of Energy ◽  
Low Density ◽  
Foam Density ◽  
Structure Property ◽  
Microcellular Foams ◽  
Structure Property Relationships ◽  
Energy Physics

AbstractHigh energy physics applications at the Department of Energy National Laboratories require unique low-density foams of demanding homogeneity specifications (cell sizes on the order of 10 μm or smaller). These delicate and fragile foams are machined and shaped into specimens to exacting tolerances. In this work, the mechanical properties of a variety of these low density microcellular foams are reported as functions of foam density and morphology.

Low-Density Microcellular Materials: Introduction

MRS Bulletin ◽  
1990 ◽  
Vol 15 (12) ◽  
pp. 19-20 ◽  
Author(s):  
J.D. LeMay ◽  
R.W. Hopper ◽  
L.W. Hrubesh ◽  
R.W. Pekala
Keyword(s):  
Cell Size ◽  
High Energy Physics ◽  
High Energy ◽  
Department Of Energy ◽  
Low Density ◽  
Asymmetric Membranes ◽  
New Methods ◽  
Small Cell Size ◽  
Application Requirements ◽  
Energy Physics

This article is dedicated to a class of specialty materials that have come to be known as low-density microcellular materials, or LDMMs. LDMMs have been developed and studied over the last decade at several U.S. Department of Energy (DOE) National Laboratories. LDMMs are used in various high energy physics programs where they meet unusual and demanding specifications (see Table 1.1).To set the stage for introducing LDMMs, it is instructive to contrast them with more familiar cellular materials. Examples of commercially available low-density materials are plastic “blown cell” foams, such as polyurethane cushions and polystyrene coffee cups. Asymmetric membranes and filters, on the other hand, are representative of commercially available microcellular materials. The processes used to make these products generally are not suitable for making LDMMs, however, because they are limited by a tradeoff between density and cell size. That is, they yield low densities only at the expense of increased cell size, or small cell size at the expense of increased density. The challenge to DOE materials scientists, therefore, has been to develop new methods for making materials that simultaneously have low density and microcellular morphology, and also meet other application requirements (e.g., composition, homogeneity, size, and strength).LDMMs are used by the DOE laboratories because their low density and high homogeneity (implied from their microcellular morphology) make them ideal precursors or substrates for forming high-density gases or expanded plasmas.

THE DEPARTMENT OF ENERGY HIGH ENERGY PHYSICS PROGRAM

2007 ◽  
Vol 16 (12a) ◽  
pp. 1989-2001
Author(s):  
KATHLEEN TURNER
Keyword(s):  
High Energy Physics ◽  
High Energy ◽  
Department Of Energy ◽  
Community Based ◽  
Physics Program ◽  
The Us ◽  
Program Information ◽  
Energy Physics

This paper describes the high-energy-physics program at the US Department of Energy. The mission and goals of the program are described along with the breadth of the overall program. Information on recommendations from community-based panels and committees is provided. Finally, details about the main astrophysics and cosmology projects are given.

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