Advanced Design System 2009 TOP Crack
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Crack
And the crack work is just commencing. We have just begun a series of fracture and crack experiments to determine the best crack material combinations that generate the fastest crack speeds. The goal is to have the crack idea utilized in the other reference systems, which will be a significant contribution to the overall success of the project. One of the few ways that problems related to composite material cracking can be solved is by figuring out how the composite material cracks. Understanding how material cracks form in composites can lead to new composite manufacturing methods and to understanding how cracks propagate in materials which will lead to improved material design. There are a number of techniques that have been used to crack composite materials, including ultrasonic welding, explosive detonation and controlled explosively formed penetrator (EFP) welding. Ultrasonic welding, explosive detonation and EFP welding all destroy a portion of the material and therefore cannot be used on residual material. Controlled explosively formed penetrator (EFP) welding, however, is a cold welding process that produces a fast, high-velocity crack. The high-velocity crack will penetrate the material to a depth determined by the maximum stress required to drive it.
The PLM is essential for encapsulating the reflective film within the PDMS mold and thus preventing the PDMS from flowing into the cracks formed as the PVA/TiO2 film is stretched. To mitigate the manufacturing cost, we tried to use inexpensive cotton mesh as the PLM. The holes of the cotton mesh are circular in shape. When they are filled by PDMS, it tends to form a concave profile, which lowers the contact area of the PVA/TiO2 film and the PDMS layer and thus reduces the adhesion of these two layers. The circular holes of the mesh can mitigate this problem. However, the irregular profile of the mesh can lead to uneven adhesion, which could cause more cracks. In this work, we present an alternative PLM using cylindrical cavities of a PVA/TiO2 solution as the gel filtration (GF) column. In such system, the porous cylindrical tube serves as a barrier between the PDMS and the PVA/TiO2 solution and the casting of PDMS can be easily controlled. The porous nature of the tube allows PDMS to infiltrate into its interior space. Furthermore, the porosity of the device can be tuned to provide different permeability to the PDMS. Thus, the effectiveness of such porous device can be easily controlled by adjusting the pore size as well as the number of columns. 3d9ccd7d82
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