ME 323 - MECHANICS OF MATERIALS Syllabus for Fall 2020, Purdue University

LECTURE TIME AND MODE OF INSTRUCTION

Section Time (EST) Instructor Classroom Email 001 MWF 9:30-10:20 AM Prof. Marcial Gonzalez EE 129 marcial-gonzalez@purdue.edu 004 Online

Prof. Klod Kokini Online

kokini@purdue.edu F2F work sessions MWF 11:30-12:20PM FRNY G124

003 MWF 3:30-4:20 PM Prof. Chuck Krousgrill WTHR 200 krousgri@purdue.edu

002 MWF 4:30-5:20 PM Prof. Kejie Zhao RHPH 172 kjzhao@purdue.edu

005 Online Prof. Marcial Gonzalez Online marcial-gonzalez@purdue.edu JOINING THE ONLINE COMPONENTS OF THE CLASS We will be using Zoom conferencing software for our remote classes. Please download and install Zoom (https://zoom.us/download) before the first class. OFFICE HOURS Virtual office hours are a synchronous session through Zoom to discuss questions related to weekly lecture material and assignments.

Section Time (EST) Instructor Zoom link 001 Tu,Th: 8:30-9:30AM and by appointment Prof. Gonzalez Zoom link 004 MWF 1:30-2:30PM Prof. Kokini Zoom link 003 MWF 10:30-11:30 Prof. Krousgrill Zoom link 002 MWF 1:30-2:30PM Prof. Zhao Zoom link 005 Tu, Th: 8:30-9:30AM and by appointment Prof. Gonzalez Zoom link

TEACHING ASSISTANTS

Kyle Mahoney Email: mahone10@purdue.edu

Chetan Jois Email: cjois@purdue.edu

Pedro Martins Email: pcidreir@purdue.edu

Tejas Kulkarni

Email: kulkar72@purdue.edu Abd Alrhman

Email: abaniiss@purdue.edu

Virtual tutorial room: Virtual tutorial rooms are a synchronous session through Zoom to discuss questions

related to weekly homework assignments. To connect to the virtual tutorial room sessions, follow these steps: a. Use the Zoom app to access the video stream. b. Announce yourself and ask your questions. You will be able to share your screen

or camera to show your work. Prepare accordingly. Sunday: 10-12PM (Chetan - Zoom link) Monday: 9-11AM (Chetan - Zoom link) 5-7PM (Abd - Zoom link) Tuesday: 8-10AM (Tejas - Zoom link) 10-1PM (Abd - Zoom link) 5-8PM (Kyle - Zoom link) Wednesday: 8-10AM (Tejas - Zoom link) 10-1PM (Chetan - Zoom link) 1-3PM (Abd - Zoom link) 5-8PM (Tejas - Zoom link)

TEXTBOOK

Required: Course lecture book to be purchased at University Bookstore.

Optional: Mechanics of Materials, R.R. Craig, Wiley, 3rd edition, 2011.

Reference texts: Copies of three different mechanics of materials textbooks (by authors Craig, Hibbeler and Philpot) will be available at the reserve desk for the Engineering/Science library on the second floor of WALC. These books will be available for two-hour checkout starting during the second week of classes.

COURSE BLOG https://www.purdue.edu/freeform/me323/

A course blog will be used for the delivery for much of the course material, as well as provide a discussion forum for students interacting while learning from each other in the course. Please visit this site to see what material is available there. Note that the course lecture book contains many examples; solutions for many of these examples are made available to you through this blog in either YouTube or PDF format. The blog also contains a number of examples (with solution videos) not included in the lecture book. You can also find a large number of conceptual questions on the blog that you can use in preparation for the midterm and final exams in the course. You are asked to work out these conceptual problems on your own; in general, solutions will not be provided. The course blog also accommodates discussion threads for us to use during the course. Please take advantage of these discussion threads to ask and/or answer questions of your colleagues as you work through the homework assignments and exam preparation in the course. The ME 323 course instructors/TAs will monitor these discussions, and join in on the conversations as needed to answer questions. A one-page set of instructions for the course blog is attached at the end of this course syllabus document.

COPYRIGHT MATERIALS Please note that the ME 323 Lecturebook, assignments, exams, quizzes, etc. are copyrighted materials and should not be sold, bartered to others, or posted on-line without the expressed written consent of the authors. Similarly, notes taken in class are considered to be “derivative works” of the instructor’s presentations and materials and likewise should not be sold or bartered or posted on the internet without consent. Students are permitted to use their notes, assignments, exams and quizzes etc. for individual and/or group study or other non-commercial purposes reasonably rising up from enrollment in the course or the University generally.

EXAMINATIONS Date Time (EST) Online Location Exam 1 Thursday, Oct. 1st 8-10 PM Zoom link (TBA) Exam 2 Thursday, Nov. 5th 8-10 PM Zoom link (TBA) Final Exam Zoom link (TBA)

SCHEDULE

A topical schedule for the course is attached at the end of this syllabus. This schedule includes the daily reading assignment for the course lecture book. The material should be read prior to each class meeting.

GRADING

Your course grade will be based on a straight grading scale: 97-100% A+; 93-97% A; 90-93% A-; 87-90% B+; 83-87% B; 80-83% B-; 77-80% C+; 73-77% C; 70-73% C-; 67-70% D+; 63-67% D; 60-63% D-; <60% F. It is possible that, depending on the class averages at the end of the semester, the grade cutoffs can be adjusted slightly downward. However, the grades in this course are not curved with intent of satisfying particular preset grade distribution goals. The percentage breakdowns for the components of your course grade are the following:

Grades Homework + Quiz 28% Blog Q&A 2% Exam 1 and 2 25% or 45% Final Exam 45% or 25%

If you score better on the average of Exams 1 and 2 than you do on the Final, the average of these two midterm exams will count as 45% and the Final will count as 25% of your final grade, vice versa.

Homework and quizzes: 28% (total) • Typically, one homework set will be due every week, except for weeks during which exams

are given. Homework must be submitted by 11:59pm (EST) on Wednesday unless otherwise posted. Please post your HW on Gradescope on the appropriate HW link using a single PDF file (you will be asked to prescribe which page(s) each problem is on in Gradescope). Late HW will not be accepted without a personalized excuse (i.e., a generic PUSH note is not sufficient). Please review your homework submission after it has been uploaded onto Gradescope to ensure that all work has been properly submitted. If for some reason you have problems posting your HW on Gradescope, please email the instructor the PDF of your HW before the 11:59pm (EST) deadline with an explanation. Your work needs to be presented with a logical thought process and in a neat, easy-to-read style. Failure to do so can result in a loss of points in your homework grade.

• Unannounced quizzes will be given regularly throughout the semester. Make-up quizzes will not be given.

Midterm and final exams: 70% (total)

All exams will be given online, closed book, and closed notes. A list of relevant equations will be provided with the exam and posted online. There will be a 30-minute grace period to submit your solution on Gradescope using a single PDF file for each problem. If an exam solution is not submitted and you do not inform your instruction of technical difficulties before the end of the grace period, the grade will be recorded as a zero. Make-up exams will be given only in the event of documented illness or emergency.

• Two, two-hour midterm exams will be given during the semester on dates shown on the course schedule.

• A final exam will be given during the regular University final exam period at the end of the semester. The date of the exam will be announced later in the course.

Regrade Requests: Regrade requests may be considered for graded exams or homework but only in cases where (a) points were incorrectly added, or (b) the grader clearly did not read or did misread part of the solution. If you have a genuine regrade request, please submit a regrade request on Gradescope with a clear explanation on why your exam/homework/project should be regraded. Regrade requests will be considered only if submitted within a week of when you first receive your graded work.

ELECTRONIC DEVICES

You are asked to not use electronic communication devices during class time (this includes reading/sending text messages and using a laptop computer for other than taking class notes). Please turn off cell phones before coming to class and put away your cell phone before the start of class.

CALCULATOR POLICY

This course follows the Mechanical Engineering Calculator Policy. Accordingly, only TI-30XIIS calculators are to be used for quizzes and exams.

ACADEMIC DISHONESTY POLICY

Faculty and students working together can promote a fair and positive academic environment. All students are expected to conduct themselves in an ethical manner. Students are permitted to discuss homework assignments together, but should do their own work when preparing a problem solution (i.e., copying of a solution manual, an on-line resource such as Chegg, or another student’s work, as well as posting problems to an on-line service such as Chegg, is explicitly prohibited). Exams are to be completed without unauthorized assistance. Any student caught cheating on an assignment or exam will receive disciplinary action, up to and including receiving a grade of “F” for the course. In addition, documentation of the infraction will be forwarded to the Office of the Dean of Students (ODOS), which may result in additional disciplinary sanctions, up to and including expulsion from the University. All of us are equally responsible for ensuring a fair and positive environment. If you become aware of any dishonest activities, please report the infractions to the instructors (anonymously if you prefer) and we will investigate the concerns. If there is sufficient evidence of academic dishonesty, we will take disciplinary action. Finally, remember if you are complicit in assisting a peer to cheat, you are equally guilty. Please take to heart Purdue’s Honor Pledge:

ATTENDANCE

Students should stay home and contact the Protect Purdue Health Center (496-INFO) if they feel ill, have any symptoms associated with COVID-19, or suspect they have been exposed to the virus. In the current context of COVID-19, in-person attendance will not be a factor in the final grades, but the student still needs to inform the instructor of any conflict that can be anticipated and will affect the submission of an assignment or the ability to take an exam. Only the instructor can excuse a student from a course requirement or responsibility. When the student is unable to make direct contact with the instructor and is unable to leave word with the instructor’s department because of circumstances beyond the student’s control, and in cases of bereavement, quarantine, or isolation, the student or the student’s representative should contact the Office of the Dean of Students via email or phone at 765-494-1747. Our course Brightspace includes a link on Attendance and Grief Absence policies under the University Policies menu.

LEAVING CLASS

You are expected to arrive to class on time and remain in the classroom throughout the class period. If you have a medical condition that requires you to step out of the room during the class period, please see your instructor at the start of the term. Otherwise, please plan ahead so that you do not need to take breaks in the middle of class.

CLASSROOM GUIDANCE REGARDING PROTECT PURDUE

The Protect Purdue Plan, which includes the Protect Purdue Pledge, is campus policy and as such all members of the Purdue community must comply with the required health and safety guidelines. Required behaviors in this class include: staying home and contacting the Protect Purdue Health Center (496-INFO) if you feel ill or know you have been exposed to the virus, wearing a mask in classrooms and campus building, at all times (e.g., no eating/drinking in the classroom), disinfecting desk/workspace prior to and after use, maintaining proper social distancing with peers and instructors (including when entering/exiting classrooms), refraining from moving furniture, avoiding shared use of personal items, maintaining robust hygiene (e.g., handwashing, disposal of tissues) prior to, during and after class, and following all safety directions from the instructor.

“As a boilermaker pursuing academic excellence, I pledge to be

honest and true in all that I do. Accountable together - we are Purdue.”

Students who are not engaging in these behaviors (e.g., wearing a mask) will be offered the opportunity to comply. If non-compliance continues, possible results include instructors asking the student to leave class and instructors dismissing the whole class. Students who do not comply with the required health behaviors are violating the University Code of Conduct and will be reported to the Dean of Students Office with sanctions ranging from educational requirements to dismissal from the university. Any student who has substantial reason to believe that another person in a campus room (e.g., classroom) is threatening the safety of others by not complying (e.g., not wearing a mask) may leave the room without consequence. The student is encouraged to report the behavior to and discuss next steps with their instructor. Students also have the option of reporting the behavior to the Office of the Student Rights and Responsibilities. See also Purdue University Bill of Student Rights.

CAMPUS EMERGENCIES

In the event of a major campus emergency (e.g., severe weather, active shooter, etc.), course requirements, deadlines and grading percentages are subject to changes that may be necessitated by a revised semester calendar or other circumstances. The School of Mechanical Engineering will provide details regarding access to information online and any additional procedures that may be needed as soon as they are available or can be obtained by contacting the instructors or TAs via mail or phone. You are expected to read your @purdue.edu email on a frequent basis.

STUDENTS WITH DISABILITIES

If you have a disability that requires special academic accommodation, please make an appointment to speak with your instructor within the first week of the semester in order to discuss any adjustments and bring your accommodation letter from the Disability Resource Center. It is important that we are informed about this at the beginning of the semester. It is the student's responsibility to notify the Disability Resource Center (http://www.purdue.edu/drc) of an impairment/condition that may require accommodations and/or classroom modifications. If a student does not notify their instructor well in advance about the need for accommodations, there may not be time to arrange some accommodations.

ACADEMIC GUIDANCE IN THE EVENT A STUDENT IS QUARENTINED OR ISOLATED

If you become quarantined or isolated at any point in time during the semester, in addition to support from the Protect Purdue Health Center, you will also have access to an Academic Case Manager who can provide you academic support during this time. Your Academic Case Manager can be reached at acmq@purdue.edu and will provide you with general guidelines/resources around communicating with your instructor, be available for academic support, and offer suggestions for how to be successful when learning remotely. Importantly, if you find yourself too sick to progress in the course, notify your academic case manager and notify me via email. They will make arrangements based on your particular situation. The Office of the Dean of Students (odos@purdue.edu) is also available to support you should this situation occur

ME 323 - MECHANICS OF MATERIALS

Schedule for Fall 2020

PER DATE TOPIC READING* HWK DUE 1 M 24-Aug Introduction; Static equilibrium Chap. 1 2 W 26-Aug Normal stress and strain; Mechanical properties Chap. 2 3 F 28-Aug Shear stress and strain – direct shear Chap. 3 4 M 31-Aug Stress – introduction to design of deformable bodies Chap. 4 5 W 2-Sep Stress and strain – general definitions Chap. 5 HW. 1 6 F 4-Sep Axial members – determinate structures Chap. 6 7 M 7-Sep Axial members – indeterminate structures Chap. 6 8 W 9-Sep Axial members – planar trusses Chap. 6 HW. 2 9 F 11-Sep Axial members – thermal effects Chap. 7 10 M 14-Sep Torsion members – stresses in circular bars Chap. 8 11 W 16-Sep Torsion members – statically determinate structures Chap. 8 HW. 3 12 F 18-Sep Torsion members – statically indeterminate structures Chap. 8 13 M 21-Sep Beams – shear and moment diagrams Chap. 9 14 W 23-Sep Beams – shear and moment diagrams Chap. 9 HW. 4 15 F 25-Sep Beams – flexural stresses Chap. 10 16 M 28-Sep Review 17 Th 1-Oct Examination 1, 8-10p.m. (no lecture on Wednesday) 18 F 2-Oct Beams – flexural and shear stresses Chap. 10 19 M 5-Oct Beams – shear stresses Chap. 10 20 F 7-Oct Beams – deflections in determinate structures Chap. 11 HW. 5 21 F 9-Oct Beams – deflections in determinate structures Chap. 11 22 M 12-Oct Beams – deflections in indeterminate structures Chap. 11 23 W 14-Oct Beams – deflections using superposition methods Chap. 11 HW. 6 24 F 16-Oct Energy methods – Castigliano’s theorems Chap. 16 25 M 19-Oct Energy methods – Castigliano’s theorems Chap. 16 26 W 21-Oct Energy methods – Castigliano’s theorems Chap. 16 HW. 7 27 F 23-Oct Energy methods – introduction to finite element methods Chap. 17 28 M 26-Oct Energy methods – introduction to finite element methods Chap. 17 29 W 28-Oct Energy methods – introduction to finite element methods Chap. 17 HW. 8 30 F 30-Oct Thin-walled pressure vessels – axial and hoop stresses Chap. 12 31 W 2-Nov Review 32 Th 5-Nov Examination 2, 8-10p.m. (no lecture on Wednesday) 33 M 6-Nov Stress transformation – principal /maximum shear stresses Chap. 13 34 F 9-Nov Stress transformation – Mohr’s circle Chap. 13 35 M 11-Nov Stress transformation – Mohr’s circle Chap. 13 HW. 9 36 F 13-Nov Stress transformation – absolute maximum shear stress Chap. 13 37 M 16-Nov Stresses – combined loading Chap. 14 38 W 18-Nov Stresses – combined loading Chap. 14 HW. 10 39 F 20-Nov Stresses – combined loading Chap. 14 40 M 23-Nov Failure analysis – stress theories Chap. 15 W 25-Nov Thanksgiving – no class F 27-Nov Thanksgiving – no class 41 M 30-Nov ONLINE: Failure analysis – stress theories Chap. 15 42 W 2-Dec ONLINE: Failure analysis – buckling of columns Chap. 18 43 F 4-Dec ONLINE: Review HW. 11 TBA Final Examination

* Reading assignments from lecture book

ME 323 – Course Blog Fall 2020

The blog discussion threads for this course are intended to provide a forum for the exchange of ideas among the students in the class, and between the students and the instructor. From this blog, you can get/provide assistance from/to other people in the class. We have found that you can often learn as much from helping others as from getting help for yourself. LOGGING IN: You can access all of the information on the blog except adding blog posts without logging in. In order to log in, do the following:

1. Use your Purdue Career Account login. Do NOT use the BoilerKey (two-factor) authentication.

2. On the first login, you will need to receive approval prior to being able to post comments. We will get this approval done quickly as possible. It is recommended that you log onto the blog during the first week of class in order to get this approval process done in time for you to use the blog throughout the semester.

ANONYMITY IN POSTING:�When you first log onto the course blog and are approved by your instructor, your default User Name is set to that of your Purdue Career Account. This User Name will appear with each comment that you post on the blog. If you would like to post anonymously, you are able to choose a new “Nickname” that will be displayed instead of your User Name on the comments. To do so:

1. Go to your “Edit my profile” in the upper right of the Admin Bar under “Howdy”.� 2. Add a nickname in the “Nickname” (required)” box.�

3. In the “Display name publicly as”, choose the desired nickname from the drop-down list.

4. Click “Update Profile” at the bottom of the page.

You may add additional Nicknames, and switch among these for different displays throughout the semester. If being anonymous to your colleagues is important to you for your postings, choose nicknames that will help you maintain your anonymity.

Page 1

For the majority of your paper-based and handwritten Gradescope assignments, you need to scan hard copies of your pages and save them as a PDF before submitting. No scanner? No problem. This guide will teach you how to scan your work on an iOS (Page 1) and Android device (Page 2) and then how to submit your scans in Gradescope from your computer, phone, or tablet (Page 3). If you are using a scanner to scan your work, skip to Page 3.

Submitting PDF homework in Gradescope

1. DOWNLOAD: In the App Store, download Scannable by Evernote (our recommended app for iOS devices). You can also download and follow a similar process with Genius Scan or another scanning app that produces high-quality PDFs.

2. SCAN: Open Scannable. Click the three dots > Settings > File Type > PDF. Then, click the back arrow > Done. Hold your phone above each page. The app will scan each page automatically as soon as it finds it. When you’ve scanned every page, click the check mark.

3. REVIEW: Review your scans. Make sure all pages are in one PDF. If your scans are blurry, use the TIPS FOR SCANNING on the right. Name your file by tapping the file name next to the PDF icon.

4. SHARE: Click Send. Then, click Mail to email the scans to yourself or click Share > Save to Files or Dropbox (or another cloud service). You may need to scroll to find all the “Save to...” options on your phone. Now, see Page 3 to learn how to log in and submit your scans.

Scanning on iOS DevicesTIPS FOR SCANNING:

Use dark lettering: Use the darkest pen, pencil, or font color possible to do your work.

Scan on a flat surface: Scan on a dark table with high contrast to your paper.

Steady your hands: Hold your phone at a bird’s eye view and scan your pages slowly with steady hands.

Restore photos, if needed: If your scans are blurry after clicking the check mark, select the thumbnail of the scan > Slider icon > Restore.

Step 2. SCAN Step 3. REVIEW Step 4. SHARE

Page 2

Scanning on Android Devices

TIPS FOR SCANNING:

Use dark lettering: Use the darkest pen, pencil, or font color possible to do your work.

Scan on a flat surface: Scan on a dark table with high contrast to your paper.

Steady your hands: Hold your phone at a bird’s eye view and scan your pages slowly with steady hands.

Enhance scans, if needed: If a scan is blurry, crooked, etc. once you’re finished, select the thumbnail of that scan. Then, use the Edit, Filters, and Format button to fix them.

1. DOWNLOAD: In the Play Store, download Genius Scan (our recommended app for Android Devices). You can also download and follow a similar process with another scanning app that produces high-quality PDFs.

2. SCAN: Open Genius Scan. Select the camera icon on the main screen. If you’re scanning multiple pages, tap the image icon Hold your phone above each page and click the spinning circle. Repeat for each page. The number in the circle will track how many pages you’ve scanned to the document. Click the check mark when you’ve scanned all your pages.

3. REVIEW: Make sure all your pages are in one document. Name your document by tapping the name file name at the top of your screen. Review your scans for legibility. If your scans are blurry, use the TIPS FOR SCANNING on the right.

4. SHARE: Select your document, click the Share icon. Make sure the Format is set to PDF. Then, click Mail to send it to yourself, click Device Memory to save it on your phone, or click Google Drive or Dropbox (or another cloud storage option) to save it to the cloud. Now, see Page 3 to learn how to log in and submit your scans.

in the top right corner of the screen to switch to batch mode .

Step 2. SCAN Step 3. REVIEW Step 4. SHARE

Page 3

Finding your assignment

Submitting a PDF

1. LOG IN: Log in to gradescope.com on a computer, phone, or tablet where you can access your submission file. Be sure to log in with the email address your instructor used to add you to the course. If you’re not sure which address to use, check your inboxes for an email from Gradescope about enrollment in this course, contact your instructor, or email help@gradescope.com.

2. SELECT: On your Dashboard, select the correct course and then assignment you’ll be turning in. If you see see a submission dialog box on your screen next, move down to Submitting a PDF. If you see a message that your assignment will be timed, read the message carefully to see how many minutes you’ll have to turn in your work. Then, click Start Assignment to start the timer and get to the submission dialog box.

1. UPLOAD: In the submission dialog box, click Submit PDF > Select PDF > locate the file > Upload PDF. Keep in mind that you can only submit one PDF file per assignment. Now, your instructor’s assignment settings determine what you see on your screen after you upload. • If you’re taken to a page that asks you to assign questions and pages, go to Step 2. • If a success message pops up, you’re done! Sit back and relax or go to Step 4 to resubmit your file.

2. ASSIGN: On your screen, you should see a list of the questions/problems in your assignment and thumbnails of your PDF page(s). For each assigned question, click the PDF page(s) that contains your answer. Use the SHIFT key to select multiple questions at a time and assign them to pages. If you need to, you can also assign multiple questions to the same page and multiple pages to one question.

3. SUBMIT: Now, click Submit. You will be sent to a new page to view your submission. Once you see this page and your PDF looks good, you’re done! When your submission is successful, you’ll see a confirmation message on your screen and you’ll receive an email. If you want to resubmit, see Step 4.

4. RESUBMIT (IF NEEDED): If you need to, select the Resubmit button in the bottom right corner of your screen below your submission. Then, repeat the steps above as many times as needed before the assignment due date passes or the time limit runs out (if your instructor set one). Your instructor will only see your most recent submission. All your past submissions are in your Submission History.

Step 2. ASSIGN