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Lecture - Introduction

Lecture - Introduction - Wichita State University ME 250...

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Unformatted text preview: Wichita State University ME 250: Materials Engineering Summer 2004 M W 4:10 5:25 PM Instructor: Christian Widener [email protected] Prerequisites: CHEM 111Q & MATH 242Q Description: An Introduction to engineering materials science. Textbook: Materials Science and Engineering An Introduction, William D. Callister, Jr., Sixth Edition, John Wiley & Sons, Inc., 2003. Lectures: M W: 4:10 5:25 pm Lecture Location: 123 WH Office Hours: M W 3:00 4:00 pm or by appointment (call 978-5205) Office Location: 110 NIAR - ext. 5205 Mail Box Location: 101S EB offices Grading Homework Tests (3) Design Project Class Participation 10% 60% 25% 5% > 90% A 80 90% B 70 80% C 60 70% D < 60% F Note 1. Tests are open book, closed notes. A total of 4 exams will be given during the course of this class, 3 will count towards your final grade. I encourage you to ask questions during the exams if something is not clear or you do not understand the question. Note 2. Attendance is required. Note 3. Makeup exams will only be given for extenuating circumstances, at the instructor's discretion. The instructor is more likely to consider requests in advance of a test. Note 4. Partial credit will be given on homework and exams, at the instructor's discretion. An effort will be made to give credit commensurate with the gravity of the mistake and in line with the amount of work done, so be sure to always show your work. Note 4. cont. Show intermediate steps when practical. Even explaining your answers on certain problems may lead to partial credit in the event that your answer is wrong. Also, write as neatly as possible, and try to structure your answer in an ordered, logical manner that is easy to follow. Doing so will likely increase the number of points awarded to you. Note 5. Blackboard will be utilized. Your current grade and other information pertaining to the course will be available there. Note 6. Cheating will be dealt with severely in this course. While it is acceptable to work together on homework, your assignments should not be identical. Do your own work, and show your work, or you may receive 0 points for an assignment at the instructors discretion. Cheating on tests may result in an F in the course and possible dismissal from the university, so don't do it. Note 6. cont. Unless you are attempting to ask me a question about the test, your eyes should be trained at all times on your test and test aides on the desk in front of you, and not at your neighbor beside you or anything else. If you fail to do so, you may be asked to leave the room, receiving 0 points on the test for suspicion of cheating. Note 7. The current edition of the textbook is required. Prior editions do not have exactly the same information or problem sets, students may use them at their peril. Photocopies of textbooks are not acceptable for use on the open book exams. Note 8. Homework is generally due one week after it is assigned. Late homework will be accepted for partial credit if it is turned in before the assignment has been graded and passed back to the class. Late homework turned in after that will not be accepted. Note 9. Class participation will be an all or nothing grade at the instructors discretion. Students who have been regularly attending will receive full credit, those who do not attend regularly will receive no credit. Note 10. If you have a physical, psychiatric/emotional, or learning disability that may impact on your ability to carry out assigned course work, I encourage you to contact the Office of Disability Services (DS). The office is located in Grace Wilkie Annex, room 150, 978-3309 (voice/tty). DS will review your concerns and determine, with you, what academic accommodations are necessary and appropriate for you. All information and documentation of your disability is confidential and will not be released by DS without your written permission. Schedule The schedule included in the syllabus will hopefully remain unchanged through the semester, however changes may occur. You will always be notified of changes to the schedule both in class and on Blackboard. Test dates are the least likely things to change, however homework assigned and due dates could vary. Prerequisite Test There is a required prerequisite test for this course which will cover Calc I and Chem I. The test will be given at the beginning of class on January 24th. The test will count as one of your homework grades. ME 250 Design Project You are required to do a material selection project (with three to four students in a group). As an example, the project could be the selection of materials for a propulsion engine or the skin of a spacecraft. You need to explore what the current research going on is and what the future directions are. Design Project cont. Your project should also contain some design elements like a stress analysis, actual test data, a cost analysis, design drawings, or other types of creative analyses. You need to collect at least ten references and present the project in class using visual aids. The references must consist of mainly books and current research articles from credible technical publications. One or two internet references may count towards the ten if they are credible sites and possess valuable information. Design Project cont. I will use peer evaluations to help assign grades to projects and individual students. I will ask you to evaluate each of your group members, and each of the project groups. Your evaluations of your group members and other groups will also be part of your individual project grade. (In other words, failure to attend all of the group presentations or to make meaningful evaluations of other groups and your peers could result in points being deducted from your final project grade.) Design Project cont. You can search for materials in the Engineering Village called EV2 www.ei.org/ev2/ev2.home. It is best viewed using Microsoft Explorer. If you are accessing it from off campus you will need to go through the Library Links on the WSU homepage. Design Project cont. You can request items via our inter-library loan office online. Go to WSU library home page http://library.wichita.edu// and click on "Inter Library Loan Journal Form." Fill out the form and submit. Design Project cont. They are able to locate the requested item at no cost to you, and will send you photocopies of the articles you request through the mail to your home address. If you do not have access to a computer you may use any computer in 204EB. Just log on using your school account. Project Report Notes Title Page Should include the title of the project, group member's names, class location, and presentation date. Introduction The purpose and background of the project. Discussion - The description of the project with appropriate use of figures and tables. Note that all figures and graphs should be referred to in this narrative presentation. Project Report Notes cont. Conclusions - Review of the stated purpose of the project and discussion of how the project satisfied or did not satisfy its goals. Criticism (positive or negative) and recommendations for improvements to the material selection process related to the particular project should also be included. Project Report Notes cont. References Attach all references. Appendices - Additional figures, tables, references, etc if required. Introductions First & Last Name Major Class rank Where you're from You're favorite hobby, pastime, or interest. Tell your name one more time and how you like to be addressed. Why study Materials Science? Everything engineers design has to be made out of some kind of material. The material properties will determine the effectiveness and useful life of the object. The material will also effect the cost of the object. Ex. Titanium is one of the strongest and lightest metals, making it an excellent (albeit expensive) choice for a bicycle, but probably a poor choice for a hammer. Classification of Materials Metals Ceramics Polymers Composites Semiconductors Biomaterials Smart Materials Nanotechnology Metals Atoms are joined by metallic bonds where electrons are shared and do not belong to individual atoms. Good conductors of heat and electricity. Have a lustrous finish when polished, and are not transparent to visible light. Generally strong and possessing varying degrees of deformability. Ceramics Compounds of metallic and non-metallic elements, where electrons are not free to move as with metals. They are hard and brittle. Typically make good insulators. More resistant to high temperatures and corrosion than metals or polymers. Polymers Organic compounds chemically based on carbon, hydrogen, and other non-metallic elements. They include plastics, rubbers, and epoxies . . . among others. They have very large molecular structures, but low densities and often high deformability. Composites A combination of dissimilar materials or phases of a material, with one being encapsulated in the other, such that the best combination of properties is achieved. Ex. Fiberglass and concrete. Semiconductors Possess electrical properties which are between conductors and insulators. The electrical properties can be controlled over small spatial regions, and have made the advent of integrated circuitry possible. Ex. Silicon computer chips. Biomaterials May be organic, metallic, ceramic, polymer, composites, or semiconductors, but must be inert and compatible with living body tissues. They are used for the replacement of diseased or damaged tissues or body parts. Smart Materials Sense certain types of changes in their environments and then respond in predetermined ways. May change shape, position, natural frequency, or mechanical characteristics in response to changes in temperature, electric field, and/or magnetic fields. Ex. Shape memory alloys, piezoelectric ceramics, magnetostrictive materials, and electrorheological/magnetorheological fluids. Nanotechnology Design of a material from the atomic level upwards, where distances are measured in nanometers, and hence gives the name. New materials are created by first designing the atomic structure in order to control the final materials overall properties. Carbon nanotubes are one of the chief examples of this technology and have been used to make the strongest man made fiber currently known. Final Remarks What to expect from this course, and what I expect from you. Next Topic Chapter 2: Atomic Structure and Interatomic Bonding ...
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