empirical formula for volumetric materialremoval rate in electric discharge machining22, I MRR = K 1.23 Tmwhere MRR is metal removal rate in mm3/s; K is constant of proportionality equal to 664; I isdischarge current in A, and Tm is melting point of work metal in ºC. While the published formulaapplies to a material removal process only, due to the nature of the process it can be extrapolatedthat the same process variables (I, and Tm) apply for carbon nanotube manufacturing. Theempirical material removal rate formula is to be augmented as the results dictate. Based on thecurrent prices of carbon, and the cost of electrical energy as found from students’ electrical bills,an economical analysis is to be
, systematic and Page 13.596.5well organized. They thought that the lab experiments complemented the lecture material verywell. They suggested that SPM experimental datasets could have been more interesting and thatthe instructor should have provided more guidance in class in using the WSxM software foranalysis.AcknowledgmentsFinancial support from the National Science Foundation through grants # EEC-0530575 (PI: Dr.Santosh Kurinec) and # ECS-0521341 (PI: Dr. S. K. Gupta) is gratefully acknowledged. Someparts of this paper were presented at the ASEE St. Lawrence Section Meeting held in Toronto,ON in October 2007.Bibliography1. S. K. Gupta, Micro
. Page 13.191.93. Donovan, M. S., Bransford, J. D. & Pellegrino, J. W. (Eds.) (1999). How People Learn: Bridging research and Practice. National Academy Press, Washington, DC.4. Kikas, E. (2004). Teachers' conceptions and misconceptions concerning natural phenomena. Journal of Research in Science Teaching, 41(5) 432-448.5. Krause, S., Decker, J., Niska, J., & Alford, T. (2002). A Materials Concept Inventory for introductory materials engineering courses, National Educators Workshop Update 2002, 17, 1-8.6. Krause, S., Decker, J. C., & Griffin, R. (2003). Using a Materials Concept Inventory to assess conceptual gain in introductory materials engineering courses. 2003 Frontiers in Education Conference Proceedings
AC 2008-1816: AN INTRODUCTORY MATERIALS COURSE: MAKINGCONCRETE STAND UP TO THE TASKDavid Cottrell, University of North Carolina at Charlotte DR. DAVID S. COTTRELL is an Assistant Professor in the Department of Engineering Technology, University of North Carolina at Charlotte. He graduated from the United States Military Academy in 1978 and retired in 2000 after more than 22 years of service with the US Army Corps of Engineers. Studies at Texas A&M University resulted in an MS Degree in Civil Engineering in 1987 and a PhD in 1995. He is a registered Professional Engineer and has taught courses in statics, dynamics, mechanics of materials, graphic communications, engineering economy, and
Toughness Vs Strength Plot from Ashby et al (2007) Page 13.869.8 •REFERENCESAshby, M. F. (2005), Material Selection in Mechanical Design, 3rd Edition, Elsevier ButterworthHeinemann, Burlington, MAAshby, M. F., Shercliff, H., and Cebon, D. (2007) Materials: Engineering, Science, Processing andDesign, 1st Edition, Elsevier Butterworth Heinemann, Burlington, MAGranta Design (2007) CES EduPack , Cambridge, UK.Irwin, G. R. (1963), “Fracture of Pressure Vessels,” in Materials for Missiles and Spacecraft, McGrawHill, New York, pp. 204-229.Kitagawa , H. and Takahashi, S (1976),” Applicability of fracture mechanics to very small cracks or thecracks in the early stage,”. Proceedings of Second International Conference on Mechanical Behavior ofMaterials
Annual Conference and Exposition, ASEE, Portland (2005).2. Wilhelm, L., Puckett, K., Beisser, S., Wishart, W., Merideth, E., and Sivakumaran, T., Lessons learned from the implementation of electronic portfolios at three universities, TechTrends 50, 62 (2006).3. Brumm, T. J., Ellertson, A., and Mickelson, S. K., Using ePortfolios to develop and assess ABET-aligned competencies, in ASEE Annual Conference Proceedings, ASEE, Nashville Tennessee, (2003).4. Brodeur.D.R., Using Portfolios for Exit Assessment in Engineering Programs, in 32nd ASEE/IEEE Frontiers in Education Conference, ASEE/FIE, Boston (2002).5. Challis, D., Towards a mature eportfolio: Some implications for higher education, Canadian Journal of
AC 2008-18: A LABORATORY SESSION DEVELOPMENT: STUDY OFMECHANICAL PROPERTIES OF PETROLEUM-BASED PLASTIC COMPOSTBAG AND BIODEGRADABLE PLASTIC COMPOST BAGSeung Kim, Rochester Institute of Technology Dr. Spencer Seung Kim is Associate Professor in Manufacturing and Mechanical Engineering Technology/Packaging Science Department and works as Associate Director in American Packaging Corp. Center for Packaging Innovation at RIT. His research areas are in composite materials synthesis and characterization. Dr. S. Kim graduated with M.S. (1989) and Ph.D. (1993) from University of Illinois at Chicago.Bok Kim, Div. of Advanced Materials Engineering, Chonbuk National University Dr. Bok H. Kim is Professor
be used, S and L types as shown in figure 6 below. Round hole punches 8 mm and 25 mm and a carpenter’s chisel (3/4 inch) was successfully used to cut out the specimens. Thus the uniformity can be guaranteed. (a) (b) Figure 6: Two standard specimen (a) type L and (b) type S.Precautions The specimen should not be too tightly fastened to the strike plate or the base. Else some bending may be introduced if specimen is not perfectly aligned. Avoid any not smooth cut as any notch would prompt a fracture and skew the results lower. Take multiple measurements at various locations on the gage length as it is uncertain exactly
approach expanded to ceramiccomposites in the form of columns.In the lab, students simulate composite columns and use a smart spreadsheet to help optimizetheir design for engineering performance, including ‘specific’ properties. Parameters arediscussed and evaluated before the column is made. The composite is then fabricated. Finally,the composite is tested and the experimental data (‘critical load’ for columns) is compared topredictions.Introduction:The National Educator’s Workshop requires certain information be provided in the manuscript.This information includes ‘Key Words’, ‘Target Grade Level(s)’, ‘Prerequisite Knowledge’,‘Objectives’, and ‘Equipment and Supplies Needed’ are shown below. A traditional‘Introduction’ appears subsequently.Key
)and the camera were controlled using a LabView program. The microtubules were exposed tolight for 0.2 s every 200 ms. Students captured 5-10 images per sample and saved these as Tifffiles for further analysis. Due to the large size of the polymers and the fluorescent dye on thetubulin proteins, the images could be easily seen by the students. A sample of the images isshown in Figure 2, below. Figure 2: Fluorescent image of microtubules adhering to a coverslip surface. The microtubules were polymerized at 37oC for 10 minutes
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– “drillingdown” to the fundamental science and making a direct connection between thisscience and design applications. Such connections help to build a materials Page 13.802.7perspective and understanding and can be particularly valuable in developing anenthusiasm for the subject amongst first and second year students.Supporting texts and resourcesThe computer-based tools of CES EduPack can only provide one component of arounded introductory materials course. We have developed a series of supportinglectures and exercises that can help lecturers to build such a course. The choice ofsupporting textbook(s) will also be vital.The CES EduPack software introduces
the Foundation.The authors are grateful for the assistance received from numerous Department of EngineeringPhysics colleagues and others throughout University of Wisconsin - Madison and thesurrounding business community in creating videos and other learning objects in their areas ofexpertise. We also gratefully acknowledge the training provided by IPSE interns Kelly Luster invideo production and Heidi Williamson in webpage design.References1 Kight, S., J. J. Gaynor, and S.D. Adams. “Undergraduate research communities: A powerful approach to research training,” J. College Sci. Teaching, 35(7), 2006: 34-39.2 The Undergraduate Research Center for Sciences, Engineering and Mathematics and the Center for Academic and Research Excellence
Used to Load BridgeNewA 1000lb Q-Test tensile/compression machine was adapted for use in the bridge testing. Thebottom grip is removed and a support structure put in its place. This structure has a span of 22inches to accommodate the 24 inch long bridge. The upper grip is replaced with a welded steelU- shape. On the bottom of the U are openings for insertion of the steel rod(s). The machine isthen put into compression mode at a constant speed. The software controlling the machine isTestworks 3 from MTS. The loading is much smoother than before and the bridge top staysparallel to the ground. Since using this new method, the students are happier with the testingprocedure. More ‘A’ grades have resulted than with the old tester. The new tester is