Open Access. Powered by Scholars. Published by Universities.®
- Institution
- Keyword
-
- Aluminum (1)
- Braided tube (1)
- Complex curing reaction (1)
- Cosmic rays (1)
- Crosslinking (1)
-
- Digital image correlation (1)
- High performance material (1)
- Hypersonic Inflatable Aerodynamic Decelerator (1)
- Inflatable structures (1)
- Low field NMR (1)
- Molecular level dispersion (1)
- Netting theory (1)
- Phenolic system (1)
- Polyethylene (1)
- Radiation (1)
- Shielding (1)
- Spin lattice relaxation (1)
- Structural response (1)
- Publication
- Publication Type
Articles 1 - 3 of 3
Full-Text Articles in Structures and Materials
Analyses Of Densely Crosslinked Phenolic Systems Using Low Field Nmr, Jigneshkumar Patel
Analyses Of Densely Crosslinked Phenolic Systems Using Low Field Nmr, Jigneshkumar Patel
Doctoral Dissertations
A uniform dispersion of reactants is necessary to achieve a complete reaction involving multi-components, especially for the crosslinking of rigid high-performance materials. In these reactions, miscibility is crucial for curing efficiency. This miscibility is typically enhanced by adding a third component, a plasticizer. For the reaction of the highly crystalline crosslinking agent hexamethylenetetramine (HMTA) with a strongly hydrogen-bonded phenol formaldehyde resin, furfural has been traditionally used as the plasticizer. However, the reason for its effectiveness is not clear. In this doctoral thesis work, miscibility and crosslinking efficiency of plasticizers in phenolic curing reactions are studied by thermal analysis and spectroscopic …
Structural Behavior Of Inflatable, Reinforced, Braided, Tubular Members, Joshua Clapp
Structural Behavior Of Inflatable, Reinforced, Braided, Tubular Members, Joshua Clapp
Electronic Theses and Dissertations
The Hypersonic Inflatable Aerodynamic Decelerator (HIAD) system being developed by the National Aeronautics and Space Administration (NASA) is an inflatable structure composed of multiple, concentric, pressurized tori, load straps, and a thermal protection system. The HIAD overcomes limitations inherent with the use of rigid decelerators since the deployed diameter is much larger than the packed size, which makes it an enabling technology for new opportunities in space exploration. The HIAD is designed to decelerate and protect spacecraft during atmospheric re-entry. The objective of this research was to improve understanding of structural behavior of HIAD components through material testing, structural testing …
Measuring Space Radiation Shielding Effectiveness, Amir Bahadori, Edward Semones, Michael Ewert, James Broyan, Steven Walker
Measuring Space Radiation Shielding Effectiveness, Amir Bahadori, Edward Semones, Michael Ewert, James Broyan, Steven Walker
Mathematics & Statistics Faculty Publications
Passive radiation shielding is one strategy to mitigate the problem of space radiation exposure. While space vehicles are constructed largely of aluminum, polyethylene has been demonstrated to have superior shielding characteristics for both galactic cosmic rays and solar particle events due to the high hydrogen content. A method to calculate the shielding effectiveness of a material relative to reference material from Bragg peak measurements performed using energetic heavy charged particles is described. Using accelerated alpha particles at the National Aeronautics and Space Administration Space Radiation Laboratory at Brookhaven National Laboratory, the method is applied to sample tiles from the Heat …