Engineering Tutorials

M-805-A EXPERIMENTAL STRESS ANALYSIS

Strain Measurement, an ideal strain gauge, mechanical, optical, acoustical, pneumatic, dielectric and electrical strain gauges. Differential transformer and piezoelectric transducers.

Electrical Wire Resistance Strain Gauges: bonded type gauges, bonding agents, foil gauges, gauge materials. Weldable gauges. Strain gauge adhesive. Fixing of gauges. Temperature effects in bonded gauges. Gauge factor and gauge sensitivity. Measurement of stress and stress gauge.

Measuring Circuits and Strain Gauge Rosette:  Potentiometer circuit, Wheatstone bridge, circuit sensitivity and out put, temperature compensation and signal addition. Rectangular, delta and tee- delta rosette. Application of strain gauge in practical problems.

Whole Field Methods: Photoelasticity, stress loci, isoclinics, isostatics and isochromatics, stress optic law and strain optic law, photoelestic materials, polarization of light, plane polarized and elliptically polarized light. Brittle coating, crack pattern and crack detection in coating. Moire Fringe, geometry.

Analysis of Photoelasticity Data, polariscope, fringes due to principal stress direction and difference, model making, interpretation of isoclinics and isochromatics and fractional fringe order. Calibration through tension, beam and disc models. Reflection polariscopy. Application to stress concentration and stress intensity factor. Separation of stresses.

Text Book:

1. Experimental Stress Analysis, by Abdul Mubeen; Dhanpat Rai and Sons.
2. Experimental Stress Analysis, by JW Dally and WF Riley; McGraw-Hill.

Reference Books:

1. The Strain Gage Primer, by CC Perry and HR Lissner; McGraw-Hill.
2. Moire Fringes in Strain Analysis, by PS Theocaris; Pergammon Press.

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