"Historically, the use of aerogels has been limited due to their poor mechanical properties. However, polyurea aerogels have proven to be mechanically strong under quasi-static conditions. Polyurea aerogels can be created by filling molds of the desired shape with a liquid solution that then creates a solid gel filled with liquid. The liquid can be removed from the gel by supercritical drying. This thesis outlines dynamic testing as well as simulation for polyurea aerogels.
Testing has been conducted in dynamic tension and bending for densities of polyurea aerogels ranging from 0.12 g/cm3 to 0.31 g/cm3. In most cases, the mechanical properties were minimally affected when tested over a range of frequencies. In tension the previously observed increase of stiffness with density was not present. In this case the 0.17 g/cm3 has the lowest storage modulus.
Simulations were performed to develop a better understanding of structure-property response of highly porous polyurea aerogels. Micro-scale effects such as particle stiffness, bond strength, and particle frictional coefficients were incorporated into the macro-scale structure-property relationship for the prediction of the Young's modulus. Compression simulations were performed and compared to the corresponding experiment"--Abstract, page iii.
Dharani, Lokeswarappa R.
Thomas, Jeffery S., 1971-
Mechanical and Aerospace Engineering
M.S. in Aerospace Engineering
United States. Army Research Office
Missouri University of Science and Technology
ix, 55 pages
© 2013 Victoria Ann Prokopf, All rights reserved.
Thesis - Restricted Access
Aerogels -- Mechanical properties -- Computer simulation
Polymers -- Analysis -- Computer simulation
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Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://merlin.lib.umsystem.edu/record=b11034862~S5
Prokopf, Victoria Ann, "Dynamic mechanical analysis and computer simulation of polyurea aerogels" (2013). Masters Theses. 7452.
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