A Design Based Approach to Material Selection for Advanced High Temperature Reactor Components

2017 ◽  
Author(s):  
T.-L. Sham ◽  
Robert I. Jetter
Keyword(s):  
Material Properties ◽  
Material Selection ◽  
Thermal Gradients ◽  
Performance Goal ◽  
Relative Ability ◽  
Sustained Loading ◽  
Selection Decisions ◽  
Simple Consideration ◽  
High Temperature Reactor ◽  
Selection For

Material selection decisions for advanced reactor concepts are frequently based on simple consideration of required wall thickness for a particular component and the resultant cost based on averaged cost per unit, usually by weight. However, this approach does not take into consideration the overall impact of other material properties on design feasibility. An example would be the interrelated roles of thermal conductivity, thermal expansion and creep-strength on the design of components to withstand cyclic and sustained loading. The problem is that this would nominally require a detailed design and loading definition. However, as presented herein, a meaningful comparison can be achieved by selective evaluation of the ratios of the material properties required to achieve a particular performance goal for a particular design objective; for example, the relative ability to accommodate axial thermal gradients in a pressurized cylindrical vessel. This paper covers the development of such critical parametric ratios for a number of component elements and loadings and illustrates their application.

scholarly journals Gallium phosphide optical metasurfaces for visible light applications

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Mauro Melli ◽  
Melanie West ◽  
Steven Hickman ◽  
Scott Dhuey ◽  
Dianmin Lin ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Visible Light ◽  
Material Properties ◽  
Gallium Phosphide ◽  
Material Selection ◽  
Viable Alternative ◽  
Fabrication And Characterization ◽  
Selection For

AbstractThere are few materials that are broadly used for fabricating optical metasurfaces for visible light applications. Gallium phosphide (GaP) is a material that, due to its optical properties, has the potential to become a primary choice but due to the difficulties in fabrication, GaP thin films deposited on transparent substrates have never been exploited. In this article we report the design, fabrication, and characterization of three different amorphous GaP metasurfaces obtained through sputtering. Although the material properties can be further optimized, our results show the potential of this material for visible applications making it a viable alternative in the material selection for optical metasurfaces.

Ceramic Optical Package: Material Requirements and Guidelines for Material Selection

1987 ◽  
Vol 108 ◽  
Author(s):  
M. F. Yan ◽  
W. W. Rhodes
Keyword(s):  
Material Properties ◽  
Sintering Temperature ◽  
Material Selection ◽  
Cost Effective ◽  
Ceramic Materials ◽  
Electronic Components ◽  
High Quality ◽  
Package Design ◽  
Selection For ◽  
Material Requirements

ABSTRACTRecently Lightwave Device Packaging Department at AT&T Bell Laboratories has demonstrated that ceramic materials can provide cost effective and high quality packages to house optical and electronic components for lightwave communication applications. In this paper we examine the material requirements for optical packages. We also study the material properties of metals and ceramics with a potential application in optical packages. In particular, we review hermeticity, thermal conductivity, thermal expansion coefficient, dielectric constant, electrical resistivity, sintering temperature and mechanical strength of these materials. Our study will provide a data base and useful guidelines for designers to make uniformed decisions on material selection for optical package. We also review the mixing rules to predict the resultant property of a composite from the known attributes of its constituents and the use of new composite materials will provide a new degree of flexibility in the optical package design.

Communities ready for takeoff

2017 ◽  
Vol 36 (1) ◽  
pp. 14-26 ◽  
Author(s):  
Sanne A. M. Rijkhoff ◽  
Season A. Hoard ◽  
Michael J. Gaffney ◽  
Paul M. Smith
Keyword(s):  
Site Selection ◽  
Science Literature ◽  
Location Selection ◽  
Community Assets ◽  
Selection Decisions ◽  
The Social ◽  
Selection For ◽  
Insight Into ◽  
New Infrastructure ◽  
Take All

Although much of the social science literature supports the importance of community assets for success in many policy areas, these assets are often overlooked when selecting communities for new infrastructure facilities. Extensive collaboration is crucial for the success of environmental and economic projects, yet it often is not adequately addressed when making siting decisions for new projects. This article develops a social asset framework that includes social, creative, and human capital to inform site-selection decisions. This framework is applied to the Northwest Advanced Renewables Alliance project to assess community suitability for biofuel-related developments. This framework is the first to take all necessary community assets into account, providing insight into successful site selection beyond current models. The framework not only serves as a model for future biorefinery projects but also guides tasks that depend on informed location selection for success.

scholarly journals Multi Criteria Material Selection for Eco-design

2015 ◽  
Vol 12 (5) ◽  
pp. 526-536 ◽  
Author(s):  
Marco Serafini ◽  
Davide Russo ◽  
Caterina Rizzi
Keyword(s):  
Material Selection ◽  
Selection For

Compatibility Analysis of Product Design for Recyclability and Reuse

1994 ◽  
Author(s):  
Patrick Di Marco ◽  
Charles F. Eubanks ◽  
Kos Ishii
Keyword(s):  
Life Cycle ◽  
Cost Function ◽  
Product Design ◽  
Material Selection ◽  
Computer Tool ◽  
Compatibility Analysis ◽  
Life Cycle Design ◽  
Environmentally Responsible ◽  
Qualitative Knowledge ◽  
Selection For

Abstract This paper describes a method for evaluating the compatibility of a product design with respect to end-of-life product retirement issues, particularly recyclability. Designers can affect the ease of recycling in two major areas: 1) ease of disassembly, and 2) material selection for compatibility with recycling methods. The proposed method, called “clumping,” involves specification of the level of disassembly and the compatibility analysis of each remaining clump with the design’s post-life intent; i.e., reuse, remanufacturing, recycling, or disposal. The method uses qualitative knowledge to assign a normalized measure of compatibility to each clump. An empirical cost function maps the measure to an estimated cost to reprocess the product. The method is an integral part of our life-cycle design computer tool that effectively guides engineers to an environmentally responsible product design. A refrigerator in-door ice dispenser serves as an illustrative example.

Three-dimensional (3D) printed scaffold and material selection for bone repair

2019 ◽  
Vol 84 ◽  
pp. 16-33 ◽  
Author(s):  
Lei Zhang ◽  
Guojing Yang ◽  
Blake N. Johnson ◽  
Xiaofeng Jia
Keyword(s):  
Bone Repair ◽  
Material Selection ◽  
Three Dimensional ◽  
3D Printed ◽  
Selection For
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