JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Prerequisite

Strength of Materials, Theory of Elasticity desirable

Course objectives: To introduce the basic principles and methods of experimental stress analysis that includes enhancive treatment of the most versatile teaching like photo elasticity and strain gauges. It also provides the sin different experimental teaching such as more brittle coatings, thermo elastic stress analysis and NW time.

Course Outcomes

At the end of the course the students will be able to

• Know the working principle of strain gauges and do the model analysis using different theorems.
• Know the concepts of photo elasticity and its applications.
• Use the various Non-destructive testing methods.

UNIT - I

Strain Gauges - Mechanical and optical strain gauges – Description and operation –Electrical resistance- Inductance and capacitance gauges – Detailed treatment on Resistance gauges – Measurement of static and dynamic strains – Strain rosettes – Effect of transverse strains – Use of strain recorders and load cells.

UNIT - II

Model Analysis - Structural similitude – Use of models – Structural and dimensional analysis – Buckingham Pi Theorem – Muller Breslau’s principle for indirect model analysis – Use of Begg’s and Eney’s deformeters – Moment indicators – Design of models for direct and indirect analysis.

UNIT - III

Two-dimensional photo elasticity - Stress optic law – Introduction to polariscope – Plane and circular polariscope – Compensators and model materials – Material and model fringe value – Calibration of photo elastic materials – Isochromatic and isoclinic fringes – Time edge effects.

UNIT - IV

Three-dimensional photo elasticity - Introduction – Stress freezing techniques – Stress separation techniques – Scattered light photo elasticity – Reflection polariscope.

UNIT - V

Miscellaneous Methods - Brittle coating method – Birefringence techniques – Moire fringe method – Non-destructive testing – Ultrasonic pulse velocity technique – Rebound hammer method – X-ray method – Gamma-ray method.

TEXT BOOKS:

• 1. Experimental stress analysis by Dally and Riley, Mc Graw-Hill

REFERENCE BOOKS:

• 1. Experimental stress analysis by Sadhu singh, Danapathi rai publications
• 2. Handbook of Experimental Stress Analysis by Heteny M, John Wiley and Sons, New York.
• 3. Photo elasticity by Frocht M.M., Vol. I & II, John Wiley and Sons, New York. M. TECH. I Year I Sem. (ENGG. DESIGN)