Measurement of Interface Thermal Resistance With Neutron Diffraction

2013 ◽  
Vol 136 (3) ◽  
Author(s):  
Seung-Yub Lee ◽  
Harley Skorpenske ◽  
Alexandru D. Stoica ◽  
Ke An ◽  
Xun-Li Wang ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Thermal Resistance ◽  
Thermal Contact ◽  
Ambient Air ◽  
Material Interfaces ◽  
Oak Ridge ◽  
Spatially Resolved ◽  
Interface Thermal Resistance ◽  
Rotating Systems ◽  
Aluminum Plates

A noncontact, nondestructive neutron diffraction technique for measuring thermal resistance of buried material interfaces in bulk samples, inaccessible to thermocouple measurements, is described. The technique uses spatially resolved neutron diffraction measurements to measure temperature, and analytical or numerical methods to calculate the corresponding thermal resistance. It was tested at the VULCAN instrument of the Spallation Neutron Source, Oak Ridge National Laboratories on a stack of three 6061 alloy aluminum plates (heat-source, middle-plate, and heat-sink), held in dry thermal contact, at low pressure, in ambient air. The results agreed with thermocouple-based measurements. This technique is applicable to all crystalline materials and most interface configurations, and it can be used for the characterization of thermal resistance across interfaces in actual engineering parts under nonambient conditions and/or in moving/rotating systems.

Thermal Stresses in a Multilayered Anisotropic Medium With Interface Thermal Resistance

1995 ◽  
Vol 62 (3) ◽  
pp. 810-811 ◽  
Author(s):  
T. C. Chen ◽  
H. I. Jang
Keyword(s):  
Thermal Resistance ◽  
Anisotropic Medium ◽  
Thermal Stresses ◽  
Complete Solution ◽  
Thermal Contact ◽  
Plane Deformation ◽  
Numerical Illustration ◽  
Contact Conditions ◽  
Interface Thermal Resistance ◽  
Anisotropic Slab

This note is concerned with thermoelastic analysis of a multilayered anisotropic medium under the state of generalized plane deformation with interlayer thermal contact resistance. The powerful flexibility/stiffness matrix method is adopted here to obtain the complete solution of the entire layered medium by introducing the thermal and mechanical boundary and layer interface conditions including interlayer imperfect thermal contact conditions. As a numerical illustration, the effects of interlayer thermal resistance on the distributions of temperatures and thermal stresses in a laminated anisotropic slab subjected to a uniform surface temperature rise are presented.

A Technique for Interface Thermal Resistance Measurements Between a Nanoelectrode and a Substrate Using the 3ω Method

2008 ◽  
Author(s):  
Youngsuk Son ◽  
Monalisa Mazumder ◽  
Theodorian Borca-Tasciuc
Keyword(s):  
Thermal Resistance ◽  
Energy Flow ◽  
Thermoelectric Devices ◽  
3Ω Method ◽  
Interface Thermal Resistance ◽  
Fundamental Understanding ◽  
Nanoscale Interfaces ◽  
Low Dimensional

Developing a fundamental understanding regarding energy flow across nanoscale interfaces is critical in realizing viable nanoelectronics device systems and efficient low-dimensional thermoelectric devices. This work presents investigations of the interface thermal resistance (ITR) in a nanoelectrode-on-substrate system using the DC heating as well as the 3ω method.

Designing and Validating Parallel Wire Suspension Bridge Wire Strands for Neutron Diffraction Stress Mapping

2017 ◽  
Vol 905 ◽  
pp. 123-130
Author(s):  
Adrian Brügger ◽  
Seung Yub Lee ◽  
İsmail Cevdet Noyan ◽  
Raimondo Betti
Keyword(s):  
Neutron Diffraction ◽  
Steel Wire ◽  
National Laboratory ◽  
Suspension Bridge ◽  
Galvanized Steel ◽  
Element Analysis ◽  
Parallel Wire ◽  
Oak Ridge ◽  
Contact Points ◽  
Suspension Bridge Cables

Suspension-bridge cables are constructed from strands of galvanized steel wire. They are failure-critical structural members, so a fundamental understanding of their mechanics is imminently important in quantifying suspension bridge safety. The load-carrying capabilities of such strands after local wire failures have been the subject of many theoretical studies utilizing analytical equations and finite-element analysis. Little experimental data, however, exists to validate these models.Over the past five years we have developed a methodology for measuring stress/strain transfer within parallel wire strands of suspension bridge cables using neutron diffraction [1,2]. In this paper we describe the design and verification of parallel cable strands used in our studies. We describe the neutron diffraction strain measurements performed on standard 7-wire and expanded 19-wire models in various configurations at both the Los Alamos National Laboratory Spectrometer for Materials Research at Temperature and Stress (LANL SMARTS) and at the Oak Ridge National Laboratory VULCAN Engineering Materials Diffractometer (ORNL VULCAN). Particular attention is placed on the challenges of aligning and measuring multibody systems with high strain gradients at body-to-body contact points.

scholarly journals Preface: Special Topic on Advances in Modern Neutron Diffraction at Oak Ridge National Laboratory

2018 ◽  
Vol 89 (9) ◽  
pp. 092601
Author(s):  
Katharine Page ◽  
Bianca Haberl ◽  
Leighton Coates ◽  
Matthew Tucker
Keyword(s):  
Neutron Diffraction ◽  
National Laboratory ◽  
Special Topic ◽  
Oak Ridge ◽  
Oak Ridge National Laboratory

Neutron macromolecular crystallography

2018 ◽  
Vol 2 (1) ◽  
pp. 39-55 ◽  
Author(s):  
Matthew P. Blakeley ◽  
Alberto D. Podjarny
Keyword(s):  
Neutron Diffraction ◽  
Fluorescent Proteins ◽  
National Laboratory ◽  
Direct Determination ◽  
Drug Binding ◽  
Proton Accelerator ◽  
Biological Macromolecules ◽  
Macromolecular Crystallography ◽  
Neutron Sources ◽  
Oak Ridge

Neutron diffraction techniques permit direct determination of the hydrogen (H) and deuterium (D) positions in crystal structures of biological macromolecules at resolutions of ∼1.5 and 2.5 Å, respectively. In addition, neutron diffraction data can be collected from a single crystal at room temperature without radiation damage issues. By locating the positions of H/D-atoms, protonation states and water molecule orientations can be determined, leading to a more complete understanding of many biological processes and drug-binding. In the last ca. 5 years, new beamlines have come online at reactor neutron sources, such as BIODIFF at Heinz Maier-Leibnitz Zentrum and IMAGINE at Oak Ridge National Laboratory (ORNL), and at spallation neutron sources, such as MaNDi at ORNL and iBIX at the Japan Proton Accelerator Research Complex. In addition, significant improvements have been made to existing beamlines, such as LADI-III at the Institut Laue-Langevin. The new and improved instrumentations are allowing sub-mm3 crystals to be regularly used for data collection and permitting the study of larger systems (unit-cell edges >100 Å). Owing to this increase in capacity and capability, many more studies have been performed and for a wider range of macromolecules, including enzymes, signalling proteins, transport proteins, sugar-binding proteins, fluorescent proteins, hormones and oligonucleotides; of the 126 structures deposited in the Protein Data Bank, more than half have been released since 2013 (65/126, 52%). Although the overall number is still relatively small, there are a growing number of examples for which neutron macromolecular crystallography has provided the answers to questions that otherwise remained elusive.

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