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Minimizing Cooling Time for Diamond Anvil Cell Under High Pressure

Edung, Martin LU (2017) FME820 20162
Mechanics
Abstract
The main goal of the project was to decrease the cooling time of a diamond anvil cell (DAC) by modifying an existing design. Modifications included change of materials, overall dimensions and a significant reduction of mass together with additional suggestions for decreased cool time.

The initial design was known to function with current materials and dimensions. The first step of the thesis was to import the geometry, when applying the same force, but changing the materials (from Inconel to C17200 AT(TF00)) and locate high stress areas. Any part of the geometry that exceeded the yield criterion (with safety factor) was modified and tested in an iterative process until the criterion was satisfied. Material was removed in a similar... (More)
The main goal of the project was to decrease the cooling time of a diamond anvil cell (DAC) by modifying an existing design. Modifications included change of materials, overall dimensions and a significant reduction of mass together with additional suggestions for decreased cool time.

The initial design was known to function with current materials and dimensions. The first step of the thesis was to import the geometry, when applying the same force, but changing the materials (from Inconel to C17200 AT(TF00)) and locate high stress areas. Any part of the geometry that exceeded the yield criterion (with safety factor) was modified and tested in an iterative process until the criterion was satisfied. Material was removed in a similar iterative process in areas with very low stress concentrations. Finite element analysis was made with the commercial software Ansys WB. Stress analysis was carried out using Ansys WB Static Structural since the criterion did not allow any part to be out of the elastic regime. To get a sense of the decreased cooling time, a comparison between the original design and the modified design was made using Ansys WB Transient Thermal with the different geometries and materials. Material parameters (mechanical and thermal) was gathered from literature. Fatigue analysis was made by using an estimate of the RCC-MRx standard.

Apart from computational analysis, several alternations of the design was made to make it easier for manufacture and usage, together with complete machine drawings which can be viewed in the appendix.

The thesis resulted in a complete and modified structure which is within the elastic region with a safety factor of 1.2 (criteria), with an increase in diffraction aperture windows of 20 degrees (goal: up to 10 degrees) to fully capture emitting neutrons, an infinite life time against fatigue failure (goal: 500 cycles) and a total mass reduction of around 30%. The material, the dimensions and several parameters has been changed which resulted in a decreased cooling time of around 75% (goal: 10%), only by adjusting the Diamond Anvil Cell. By adjusting the Closed Cycle Refrigerator and the process of cooling the device, the cooling time could be even faster. (Less)
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author
Edung, Martin LU
supervisor
organization
course
FME820 20162
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Diamond Anvil Cell, FEA, FEM, Structural, Transient, Temperature, Ansys, Ansys WB, Machine Drawings, ESS, European Spallation Source
other publication id
ISRN LUTFD2/TFME – 17/5034 – SE(1-62)
language
English
id
8901875
date added to LUP
2017-02-03 13:35:04
date last changed
2017-02-03 13:35:04
@misc{8901875,
  abstract     = {The main goal of the project was to decrease the cooling time of a diamond anvil cell (DAC) by modifying an existing design. Modifications included change of materials, overall dimensions and a significant reduction of mass together with additional suggestions for decreased cool time. 

The initial design was known to function with current materials and dimensions. The first step of the thesis was to import the geometry, when applying the same force, but changing the materials (from Inconel to C17200 AT(TF00)) and locate high stress areas. Any part of the geometry that exceeded the yield criterion (with safety factor) was modified and tested in an iterative process until the criterion was satisfied. Material was removed in a similar iterative process in areas with very low stress concentrations. Finite element analysis was made with the commercial software Ansys WB. Stress analysis was carried out using Ansys WB Static Structural since the criterion did not allow any part to be out of the elastic regime. To get a sense of the decreased cooling time, a comparison between the original design and the modified design was made using Ansys WB Transient Thermal with the different geometries and materials. Material parameters (mechanical and thermal) was gathered from literature. Fatigue analysis was made by using an estimate of the RCC-MRx standard.

Apart from computational analysis, several alternations of the design was made to make it easier for manufacture and usage, together with complete machine drawings which can be viewed in the appendix.

The thesis resulted in a complete and modified structure which is within the elastic region with a safety factor of 1.2 (criteria), with an increase in diffraction aperture windows of 20 degrees (goal: up to 10 degrees) to fully capture emitting neutrons, an infinite life time against fatigue failure (goal: 500 cycles) and a total mass reduction of around 30%. The material, the dimensions and several parameters has been changed which resulted in a decreased cooling time of around 75% (goal: 10%), only by adjusting the Diamond Anvil Cell. By adjusting the Closed Cycle Refrigerator and the process of cooling the device, the cooling time could be even faster.},
  author       = {Edung, Martin},
  keyword      = {Diamond Anvil Cell,FEA,FEM,Structural,Transient,Temperature,Ansys,Ansys WB,Machine Drawings,ESS,European Spallation Source},
  language     = {eng},
  note         = {Student Paper},
  title        = {Minimizing Cooling Time for Diamond Anvil Cell Under High Pressure},
  year         = {2017},
}