![]() ![]() The main objective of present study is the optimization of wall thickness and lay-up of composite shell-like cowling. The main requirements to such the composite parts are the specified mechanical stiffness to withstand the non- uniform air pressure at the different flight conditions and reduce a level of noise caused by the airflow-induced vibrations at the constrained weight of the part. ![]() The glass/carbon fiber composites are widely used in the design of various aircraft and rotorcraft components such as fairings and cowlings, which have predominantly a shell-like geometry and are made of quasi-isotropic laminates. Optimization of wall thickness and lay-up for the shell-like composite structure loaded by non- uniform pressure field The paper presents four cases and their associated experimental results, making this topic appropriate for an advanced student lab project. This solution requires knowledge of all of Maxwell's time independent equations, scalar and vector potential equations, and the Lorentz force law. Here, we develop the case of a thick-walled sphere rotating in a uniform magnetic field, which is the simplest, non-trivial, magneto-statics problem that leads to complete closed-form expressions for the resulting potentials, fields, and currents. Modeling the interaction between a moving conductor and a static magnetic field is critical to understanding the operation of induction motors, eddy current braking, and the dynamics of satellites moving through Earth's magnetic field. Our results resolve a persistent issue of selective (while avoiding multiwalled nanotubes and other carbon nanostructures) synthesis of thick vertically aligned SWCNTs whose easily switchable thickness-dependent electronic properties enable advanced applications in nanoelectronic, energy, drug delivery, and membrane technologies.Ī thick-walled sphere rotating in a uniform magnetic field: The next step to de-spin a space object ![]() The proposed model based on the atomic force microanalysis suggests that this tailoring leads to uniform and dense arrays of relatively large Fe catalyst nanoparticles on which the thick SWCNTs nucleate, while small nanotubes and amorphous carbon are effectively etched away. The imposition of variable wall thickness increased PWS (481 ± 126 kPa, P3 nm in diameter) can be produced by tailoring the thickness and microstructure of the secondary catalyst supporting SiO(2) layer, which is commonly overlooked. The mean PWS of uniform wall thickness models was 410 ± 111 kPa. Each model was loaded with 120 mm Hg pressure, and von Mises PWS was computed. Experimental models explored the addition of variable wall thickness, calcifications, and intraluminal thrombus. For each aneurysm, an initial model was constructed with uniform wall thickness. Computed tomographic angiography of descending thoracic aortic aneurysms (n=10 total, 5 fusiform and 5 saccular) underwent 3-dimensional reconstruction with custom algorithms. We examined the effects of including local wall thickness, intraluminal thrombus, calcifications, and saccular geometry on peak wall stress (PWS) in finite element analysis of descending thoracic aortic aneurysms. Prior models often assume uniform aortic wall thickness and fusiform geometry. Wall stress calculated using finite element analysis has been used to predict rupture risk of aortic aneurysms. Shang, Eric K Nathan, Derek P Sprinkle, Shanna R Fairman, Ronald M Bavaria, Joseph E Gorman, Robert C Gorman, Joseph H Jackson, Benjamin M Impact of wall thickness and saccular geometry on the computational wall stress of descending thoracic aortic aneurysms.
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