Browsing by Subject "compression"
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Item Compressive and Bending Performance of Selectively Laser Melted AlSi10Mg Structures(University of Texas at Austin, 2019) Murphy, D.; Fashanu, O.; Spratt, M.; Newkirk, J.; Chandrashekhara, K.Selective laser melting (SLM) is a widely used additive manufacturing technique that effectively manufactures complex geometries such as cellular structures. However, challenges such as anisotropy and mechanical property variation are commonly found due to process parameters. In a bid to utilize this method for the commercial production of cellular structures, it is important to understand the behavior of a material under different loading conditions. In this work, the behavior of additively manufactured AlSi10Mg under compression, bending, and tension loads was investigated. Vertical and horizontal build directions are compared for each type of loading. Specimens were manufactured using the reduced build volume (RBV) chamber of the Renishaw AM 250 SLM machine.Item Estimation of CO₂ emissions from petroleum refineries based on the total operable capacity for carbon capture applications(2021) Madugula, Adhish Chandra Saketh; Sachde, Darshan; Hovorka, Susan D.; Meckel, Tim A.; Benson, Tracy J.Carbon capture and storage processes are sought to play a major role in reducing carbon emissions from large point sources. Petroleum refineries, in particular, produce several streams that are CO2-rich, including fluidized catalytic cracking, steam methane reforming, and natural gas combustion processes that generate heat for re- finery operations. Of these, stationary combustion processes account for nearly two-thirds of all CO2 generated within a refinery. In this work, a regression analysis was performed to correlate the size and power requirements for the combined capture, compression, and dehydration process dependent upon a refinery’s operating capacity. Refinery capacity and CO2 generation data from 128 U.S. refineries were normalized, and a linear regression model was developed. A capture, compression, and dehydration process model was developed using Aspen HYSYS for delivery of CO2 (10–15 wt. % in steam) to pipeline specifications (500 ppm H2O, 15.2 MPa). Predicted CO2 emissions were 0.1 to 7.7 % of actual emissions, depending on whether a refinery had a low, medium, or high carbon emission/capacity ratio.Item An Experimental Study of Design Strategies for Stiffening Thin Plates under Compression(University of Texas at Austin, 2019) Ramirez Chavez, Irving E.; Noe, Cameron; Sekar, Vigneshwaran; Jogani, Shainil; Israni, Siddharth; Bhate, DhruvIncreasing stiffness and failure loads while minimizing mass is useful in many engineering applications, including the design of thin plates and shells. In this paper, the performance of thin plates using a range of stiffening approaches were studied for the specific instance of compressive loading. Periodic, graded, stepped, “Voronoi” stochastic, and topologically optimized patterns were explored. These stiffening designs were realized using different software tools and manufactured with the Selective Laser Sintering (SLS) process. These 3D printed specimens were tested under compression to assess their mechanical response. Videos of these tests were recorded to study the shape of the failure modes. This data was analyzed to determine the performance of the different stiffener designs, in comparison to the performance of baseline plates without any stiffening. The study concludes with a discussion of the results and their implications for stiffening thin plates, showing that triangular and stochastic stiffening strategies show particular promise in increasing specific compressive stiffness and specific buckling load.Item Letter to H.B. Stenzel from Chester Washburne on 1933-01-16(1933-01-16) Washburne, ChesterItem Physical Properties of Dense Concrete as Determined by the Relative Quantity of Cement(University of Texas at Austin, 1918-03-10) University of Texas at Austin