SEMESTER-CLASS: M.E. (Mechanical) with Machine Design Subjects

CODE: SUBJECT: Experimental Stress Analysis

Period per week(Each of 60 minutes)Lecture03

Laboratory--

Tutorial02

Evaluation SystemDuration (Hrs)Marks

In Semester Tests0120 X 02

End Semester Exam*04100

Term work--25

Seminar----

Total125

Credits04

*60% weightage for end semester exam

Course Objectives: To develop the students understanding of Plane Elasticity Theory To develop the student understands of Theory of Photoelasticity, Coating Methods, Statistics To develop students skills in Strain Measurement Methods and Measuring Instruments

Course Outcomes: Student will apply this knowledge and proper use of the basic aspects of experimental stress analysis that includes exhaustive treatment of the most versatile techniques like photoelasticity and strain gauges. In addition Student will able to apply the fundamental aspects of different experimental techniques such as Moir, Brittle Coatings in Stress Analysis

Detailed Syllabus:

ModuleDescriptionHrs.

1. Elementary Elasticity:1.1. Stress: Stress at a point, Stress equation of equilibrium, Laws of Stress transformation, Principal and Maximum shear stress, 2-D state of stress1.2. Strain: Strain Equation of Transformation, Principal Strain, Compatibility1.3. Stress Strain Relations: Strain Transformation Equation, Stress- Strain Relation for 2-D state of Stress

2. Basic Equations and Plane Elasticity Theory:2.1. Field Equations, Plane Elastic Problem, Plane stress and Plane Strain approach2.2. Airys Stress Function, Forms of Airys Stress Function in Cartesian and Polar Coordinates, 2-D problems Cartesian and Polar Coordinates

3. Strain Measurement Methods:3.1. Strain Measurement: Strain and Experimental Determinations Relations, Types of Strain Gauges, Properties of Strain Gauges, Grid Method of Strain Analysis3.2. Electrical Resistance Strain Gauge:Strain sensitivity in metallic alloy, gauge construction, Gauge adhesives and mounting methods, Strain Gauge sensitivity and Gauge factor, Environmental Effects3.3. Strain Analysis Methods, The Three element Rectangular Rosette, Residual Stress Determination

4. Optical Method of stress Analysis:4.1. Basis optics: Wave Theory of light, Reflection and refraction, Optical Diffraction and Interference, Optical Instruments like Polariscope, Interferometer and Shadow caustics4.2. Moir Method:Moir Fringe, Experimental Procedure and technique, moir interferometry

5. Theory of Photoelasticity5.1. Stress Optic law, Effect of Stressed Model in Plane Polariscope and Circular Polariscope5.2. Applied Photoelasticity in 2- D and 3-D Stress Analysis, Materials for Photoelasticity, Slicing Model and Interpretation of Fringe Model

6. Coating Methods:6.1. Photelastic Coating, Coating Stress, Coating Materials, Stress Strain Optic Relations for Coating, Coating Thickness and Bonding6.2. Brittle Coatings, Commercial Types, Test Procedure, Analysis of Brittle Coating Data

7. Application of Statistics7.1. Statistical Distributions, Statistical Distribution Functions, Confidence Intervals, Comparison of Mean, 7.2. Regression Analysis, Chi-square Test, Error Propogation

Recommended Books:1. Experimental Stress analysis- James Dally, William Riley, McGraw Hill.2. Theory of Elasticity (Third Ed.) Timoshenko, Stephen P.; James Norman Goodier (1970). McGraw-Hill International Editions.3. Experimental Stress analysis - Sadhu Singh, Dhanpat Rai and Sons4. Experimental Stress Analysis, L.S. Srinath, M.R. Raghavan, K. Lingaiah, G. Gargesa, B. Pant, and K. Ramachandra Tata Mc Graw Hill, 1984.5. Handbook of Experimental Solid Mechanics, W.N. Sharpe (Ed.), Springer6. Photoelastic Stress Analysis, Kuske A., G. Robertson, John Wiley & Sons (1974)

Term work: Assignment based on above topics and seminars.

Sr. No.ExaminationModule

1T-1Module 1 and 2

2T-2Module 3 and 4

3Final ExaminationModule 1 to 7