http://hdl.handle.net/10057/179 Search the Channel s http://soar.wichita.edu:8080/dspace/simple-search http://hdl.handle.net/10057/1360 title: Effect of cutting temperatures on the hole quality of a carbon-fiber composite authors: Rahman, Khan Habeeb Ur; Bahr, Behnam <br>abstract: The drilling of composites project is aimed at minimizing delamination and reducing the fiber pull out, thereby improving the hole quality. The heat generated during drilling has an adverse effect on the hole quality. So it is important to analyze the effect of cutting temperatures on the dimensional accuracy of the drilled hole namely hole oversize and roundness and also its effect on the surface finish/roughness of the drilled hole. The drill bit will also be tested for the same parameters using a mist cooling system. These results will be compared with one another. Also the results of different drill bits will be compared with one another. <br>description: Paper presented to the 4th Annual Symposium on Graduate Research and Scholarly Projects (GRASP) held at the Hughes Metropolitan Complex, Wichita State University, April 25, 2008. <br> Thu, 24 Apr 2008 22:58:59 GMT http://hdl.handle.net/10057/919 title: Investigation of the effect of different parameters in the drilled hole quality in composite materials authors: Sahraie Jahromi, Ashkan; Rahman, Khan Habeeb Ur; Bassi, R.; Bahr, Behnam <br>abstract: Two different delamination mechanisms that need to be controlled by the drill geometry and thrust force will be observed in the drilling of composites. The studies which have been done up to now focus on the thrust force aspect and drill bit geometry at a constant feed rate. It is possible to find a feed rate at the beginning of the penetration that corresponds to the rate at which the laminates are peeled out. Moreover, at the exit, the fiber push-down mechanism is active, which can be controlled by controlling the maximum thrust force. Thrust force itself depends on the feed rate, so there should be a “feed ratedepth” graph minimizing the delamination. This implies that the feed rate may need to be changed from high to low as the drill bit enters and exits. To find the best result several experiments are being run at the constant feed rate. Some of these feed rates will give reduced fiber pull outs at the entrance and some will result in acceptable fiber push downs at the exit. The best graph will be extracted by analyzing the delamination for each feed rate. For measuring, a microscope should be used to determine the areas with the maximum delamination along the cross section of the hole. Also, measuring the surface roughness is another method of determining the delamination, but it should be done at a certain depth at the entrance as well as exit, not all of the thickness at once. [1] <br>description: Paper presented to the 3rd Annual Symposium on Graduate Research and Scholarly Projects (GRASP) held at the Hughes Metropolitan Complex, Wichita State University, April 27, 2007. <br> Thu, 26 Apr 2007 22:58:59 GMT http://hdl.handle.net/10057/918 title: Determination of damage area of spacecraft shields impacted by space debris at hypervelocity using an SPH mesh. authors: Bhargavi, S.S.; Soschinske, Kurt A.; Lankarani, Hamid M. <br>abstract: Space debris, are objects in Earth orbit consisting of small fragments from spent rocket stages and non-functional satellites. Accumulated in the lower earth orbit, these often cause considerable damage to the spacecraft orbiting around the earth. Hence it’s necessary to develop ways to protect the newly placed spacecraft from the debris. The goal of the project was to determine the damage area of the pressure wall using the Smoothed Particle Hydrodynamic (SPH) meshing, a dynamic finite element modeling (FEM) method. <br>description: Paper presented to the 3rd Annual Symposium on Graduate Research and Scholarly Projects (GRASP) held at the Hughes Metropolitan Complex, Wichita State University, April 27, 2007. <br> Thu, 26 Apr 2007 22:58:59 GMT http://hdl.handle.net/10057/917 title: Crevice corrosion theory, mechanisms and prevention methods authors: Rashidi, Navid; Alavi-Soltani, Seyed R.; Asmatulu, Ramazan <br>abstract: This paper reviews theory and mechanisms of crevice corrosion as well as its prevention methods. Crevice corrosion is one of the most important and harmful forms of localized corrosion that may cause sudden failure of the metal in service if not prevented properly. So far several protection methods against crevice corrosion have been developed including cathodic protection and using inhibitors and coatings. Hot wax dip method and sealing crevices with polysulfide are two popular protection methods currently used in automotive and aerospace industries respectively. However researches about this devastating type of corrosion still continue. <br>description: Paper presented to the 3rd Annual Symposium on Graduate Research and Scholarly Projects (GRASP) held at the Hughes Metropolitan Complex, Wichita State University, April 27, 2007. <br> Thu, 26 Apr 2007 22:58:59 GMT