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Mechanics of Materials

(MoM) ME- 210

Professor Riaz Ahmad, PhD

Brief Biography

 Graduated in 1984, as Aerospace Engineer with degree from NED  Worked in Aerospace Industry until late 90s  Joined Academia in March 2000 after post graduate education  (Masters and PhD in Aeronautical Manufacturing)  Deputed to this campus in 2010 as founding HoD and VP of SMME  Dir Research  Dir QA and Head of NIO  New Assignment to Establish AE dept at SMME  My Current Position is HoD Aerospace Engineering Department

Course Presentation and Assessment Course Name: Mechanics of Materials (ME 210) Credit Hour: 03 Contact Hours: 03 per week Min. Attendance: 75% Assignments: 4 - 6 Quizzes: 4 - 6 MSE: 1 (week 9 Tentatively) ESE: 1 (week 18)

Course Evaluation

• Assignments 5%
• Quizzes 10 - 15%
• Project If any (5%)
• MSE 30%-35%
• Final 40 - 50%

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Grading on Curve

Number of students who will earn each letter grade is determined before the start of the course e.g. Only Top 2 % Students get ‘A’ Grade 2% Students must Fail The curve referred to is the normal bell-shaped curve, is used to describe data on a sizable heterogeneous group.

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Standard Deviation

Students are graded by considering “spread of marks around the mean” Defin: “A standard deviation is a number that indicates how much a group of scores vary from one another on average”

Word about OBE & Grading system

Course Learning Outcomes (CLOs): No CLO PLO Level of Learning Checking 1 Recognize the basic concepts of mechanics in the determination of material strength, calculation of centroid, 2 nd moment of area PLO 2 C2 Quizzes,, MSE ESE 2 Solve axially loaded and torsional members under given loading conditions PLO 2 C3 Quizzes, MSE ESE 3 Analyze beams by using shear force/bending moment diagrams for provided loading conditions and determine deflection in beams under transverse loading. Discover and analyze the concept of curved sections. Analyse thin-walled pressure vessels and determine stresses in thin-walled pressure vessels. PLO 2 C4 Quizzes, Assignments, ESE

ME 210: Mechanics of Materials I Course Code: ME 210 Semester: Spring 2023 Credit Hours: 3+0 Prerequisite Codes: Engineering Mechanics (statics) Instructor: Prof Riaz Ahmad Class: BS-ME-2021 A Office: 413, SMME Bldg Telephone: 051 - 90855976/ Lecture Days: Tue and Th E-mail: [email protected] Class Room: 307 Consulting Hours: Wednesday 1400- 1700 Lab Engineer: Muhammad Nabeel 03335498745 Lab Engineer Email: [email protected] u.pk Updates on LMS/Teams: At start of lecture

Reference Material

• Lecture slides / notes
• Khan Academy www.khanacademy.org
  • (for revising important basic concepts of stress and strain – if needed)
• MIT Open Courseware https://ocw.mit.edu/courses Search for similar named courses!

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• Use of mobile phones in the class / during

the lecture and tests is strictly prohibited.

• Violation may result in confiscation of the

device! And disciplinary action.

• There is no retest for quizzes the MSE and

ESE can have retest as per applicable NUST

policy. Level of difficulty for retest will be

extremely high

Warning

Review of important concepts – STATICS

• Vectors
• Forces and moments
• Equilibrium of rigid bodies
• Distributed forces: centroids and centers of gravity
• Forces in beams
• First moment of areas/Centroid
• Moment of Inertia

Review of Fundamentals

Lecture 2

First Moment of Areas (Principles)

• The coordinates of the centroid of an area can be obtained by dividing the first moments of that area by the area itself.
• The first moments of the area are also useful in mechanics of materials for determining the shearing stresses in beams under transverse loadings.
• If the centroid of an area is located on a coordinate axis, the first moment of the area with respect to that axis is zero. Conversely, if the first moment of an area with respect to a coordinate axis is zero, then the centroid of the area is located on that axis. 19

First Moment of Areas (Centroid) ∫ 𝑥 𝑑𝐴 is the first moment of area about y-axis 𝑄 𝑦

∫ 𝑦 𝑑𝐴 is the first moment of area about x-axis 𝑄 𝑥

Also 𝑄 𝑦 = 𝑥ҧ𝐴 and 𝑄 𝑥

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