### STRENGTH OF MATERIALS | Lectures, Self Study & Quiz | Diploma Mechanical

 Course Title: STRENGTH OF MATERIALS Scheme (L:T:P) : 4:0:0 Total Contact Hours: 52 Course Code: 15ME31T Type of Course: Lectures, Self Study & Quiz Credit :04 Core/ Elective: Core CIE- 25 Marks                                                                                                          SEE-100 Marks

Prerequisites: Knowledge of basic mathematics and Science.

1.     The subject is pre-requisite for understanding principles of Machine design.

2.     Understanding the mechanical properties of materials will help in selecting the suitable materials for various engineering applications

On successful completion of the course, the students will be able to attain CO:

 Course Outcome CL Linked PO Teaching Hrs CO1 Understand                  and                  distinguish       the behavior   of                     simple               load                  carrying members subjected to an axial, shear, and thermal Loading. R/U/A 1,2,3,9 14 CO2 Interpret the Variation of the moment of inertia for different Mechanical Engineering Sections such as fly wheel R/U/A 1,2,4,9 10 CO3 Draw and Compare the shear force and bending moment diagram on beams under varying load conditions. R/U/A 1,2,4,9 12 CO4 Assess Bending and shear stresses in beams subjected to different loadings for different machine parts R/U/A 1,2 07 C05 Differentiate in strain energy stored in a body when the load is suddenly applied and gradually applied U/A 1,2 03 C06 Design simple solid and hollow shaft for power transmission keeping view of Environmental and sustainability aspects R/A 1,2,6 06 Total sessions 52

Legend: R; Remember, U: Understand A: Application

COURSE-PO ATTAINMENT MATRIX

 Course Programme Outcomes 1 2 3 4 5 6 7 8 9 10 STRENGTH OF MATERIALS 3 3 1 3 - 1 - - 3 -

The method is to relate the level of PO with the number of hours devoted to the COs which address the given PO. If >40% of classroom sessions addressing a particular PO, it is considered that PO is addressed at Level 3

If 25 to 40% of classroom sessions addressing a particular PO, it is considered that the PO is addressed at Level 2 If 5 to 25% of classroom sessions addressing a particular PO, it is considered that the PO is addressed at Level 1

If < 5% of classroom sessions addressing a particular PO, it is considered that the PO is considered not-addressed.

COURSE CONTENT AND BLUEPRINT OF MARKS FOR SEE

 Unit No Unit Name Hour Questions to be set for SEE Marks weightage the weightage (%) R U A 1 SIMPLE STRESSES AND STRAINS 14 05 05 20 30 21 2 MOMENT OF INERTIA 10 05 05 20 30 21 3 SHEAR FORCE AND BENDING MOMENT 12 05 05 20 30 21 4 THEORY OF SIMPLE BENDING 07 05 05 20 30 21 5 STRAIN ENERGY AND IMPACT LOADING 03 - 05 05 10 06 6 TORSION OF CIRCULAR SHAFT 06 05 -- 10 15 10 Total 52 25 25 90 145 100

Legend: R; Remember, U: Understand A: Application

Simple stresses & strains viz. tensile, compressive, Shear, Crushing, Thermal stresses, & corresponding strains,Hook’s Law –Problems on Direct Stress & Linear Strain- Stress-Strain curve for Ductile material and Brittle material with all parameters.- Factor of Safety. Elastic Constants - Lateral Strain ,Poisson’s ratio, Bulk Modulus, Shear Modulus ,Volumetric Strain- The relation between elastic constants- Problems on elastic constants. Hoop stress-Longitudinal Stress in thin cylindrical & spherical shells subjected to internal pressure.-Problems on thin cylindrical shells.

Centre of Gravity, Moment of Inertia & its Importance -Parallel & Perpendicular Axis Theorem-C.G of Rectangle, Triangle, Circle, Semi-circle, Trapezium, Cone-Problems on

finding CG of T-Section, I-Section, L-Section, Channel-Section. Moment of Inertia of solid &Hollow sections like Rectangle, Triangle, Circle- Moment of Inertia about C.G for I section, T section. L-section and Channel Section.

Definition - Shear Force and Bending Moment –Types of beams, types of the load acting on

beams ,Sagging & Hogging Bending Moment and its importance –sign convention to draw SFD and BMD- Concept of Maximum bending moment, Point of Contra flexure & its importance-Drawing S.F & B.M Diagram for Cantilever, Simply Supported  Beams  subjected to Point Load and U.D.L

Introduction, assumptions in theory of simple bending.-Bending stress, relation between bending stress & radius of curvature (without proof).-Position of neutral axis, moment of resistance-Bending equation (without proof)-Modulus of section for rectangular, hollow rectangular and hollow circular sections-Beams of uniform Strength-problems

Introductionto Torsion , Angle of Twist , Polar Moment of Inertia , Torsion equation- (without proof)-Assumptions in theory of Torsion -Power Transmitted by a shaft, axle of solid and hollow sections subjected to Torsion - Comparison between Solid and Hollow Shafts subjected to pure torsion- Problems. (No problem on composite and non homogeneous shaft)

®TEXT BOOKS

1.     Ramamurtham. S., “Strength of Materials”, 14th Edition, Dhanpat Rai Publications, 2011

2.     Khurmi R S, “Applied Mechanics and Strength of Materials”, 5 Edition, S.Chandand company

REFERENCES

1.       Popov E.P, “Engineering Mechanics of Solids”, 2nd Edition, Prentice-Hall of India, New Delhi, 2002.

2.       Nash W.A, “Theory and problems in Strength of Materials”, Schaum Outline Series, McGraw-Hill Book Co., New York, 1995.

3.       Kazimi S.M.A, “Solid Mechanics”, Tata McGraw-Hill Publishing Co., New Delhi, 2003.

4.       Ryder G.H, “Strength of Materials”, 3rd Edition, Macmillan India Limited, 2002.

5.       Bansal R. K, “Strength of Materials”, Laxmi Publications, New Delhi, 2012.

6.       Timoshenko S.P, “Elements of Strength of Materials”, Tata McGraw-Hill, Delhi,

LIST OF SOFTWARE/LEARNING WEBSITES

1.   www.nptel.iitm.ac.in/courses/.../IIT.../lecture%2023%20and%2024htm

2.   www.wikipedia.org/wiki/Shear_and_moment_diagram

3.   www.freestudy.co.uk/mech%20prin%20h2/stress.pdf

4.   www.engineerstudent.co.uk/stress_and_strain.html

5.   https://www.iit.edu/arc/workshops/pdfs/Moment_Inertia.pdf

SUGGESTED LIST OF STUDENT ACTIVITYS

Note: The following activities or similar activities for assessing CIE (IA) for 5 marks (Any one).

1.                        Each student should do any one of the following type activity or any other similar activity related to the course and before conduction, get it approved from concerned Teacher and HOD.

2.                         Each student should conduct different activity and no repeating should occur

 1 Calculate Moment of Inertia of Fly Wheel of engine present in your laboratory 2 Market Survey specific to properties of Various type of Materials used in Mechanical Engineering and make report 3 Compare the strength of solid shaft with that of hallow shaft for same power transmission for an automobile and make report

Course Delivery:

å   The course will be delivered through lectures and Power point presentations/ Video.

å   MODEL OF RUBRICS /CRITERIA FOR ASSESSING STUDENT ACTIVITY

 RUBRICS FOR ACTIVITY( 5 Marks) Dimension Unsatisfactory Developing Satisfactory Good Exemplary Student Score 1 2 3 4 5 Collection of data Does not collect any information relating to the topic Collects very limited information; some relate to the topic Collect much information; but very limited relate to the topic Collects some basic information; most refer to the topic Collects a great deal of information; all refer to the topic Ex: 4 Fulfill team’s roles & duties Does not perform any duties assigned to the team role Performs very little duties but unreliable. Performs very little duties Performs nearly all duties Performs all duties of assigned team roles 5 Shares work equally Always relies on others to do the work Rarely does the assigned work; often needs reminding Usually does the assigned work; rarely needs reminding Normally does the assigned work Always does the assigned work without having to be reminded. 3 Listen to other Team mates Is always talking; never allows anyone else to speak Usually does most of the talking; rarely allows others to speak Talks good; but never show interest in listening others Listens, but sometimes talk too much Listens and speaks a fair amount 2 Average / Total marks=(4+5+3+2)/4=14/4=3.5=4

Note: This is only an example. Appropriate rubrics/criteria may be devised by the concerned faculty (Course Coordinator) for assessing the given activity.

Course Assessment and Evaluation Scheme:

 What To who m When/Where (Frequency in the course) Max Marks Evidence collected Course outcomes Direct Assessment CIE IA Three IA tests (Average of three tests will be computed) 20 Blue books 1,2,3,4,5,6 Student activities 05 Report/Log of activity SEE End Exam End of the course 100 Answer scripts at BTE 1,2,3,4,5,6 Indirect Assessment Student Feedback on course Middle of the course Feedback forms 1 & 2,3 Delivery of course End of Course Survey End of the course Questionnaires 1,2,3,4,5,6 Effectiveness of Delivery of instructions & Assessment Methods

Note: I.A. test shall be conducted for 20 marks. Average marks of three tests shall be rounded off to the next higher digit.

Note to IA verifier: The following documents to be verified by CIE verifier at the end of semester

1.     Blue books( 20 marks)

2.     Student suggested activities report for 5 marks and should be assessed on RUBRICS

3.     Student feedback on course regarding the Effectiveness of Delivery of instructions & Assessment Methods.