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Poisson's ratio on UTM
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  1. In stress analysis of rubber, why would poisons’ ratio of 0.5 be problematic?
  2. What is the physical interpretation of negative Poisson’s ratio? Give examples of materials that display this phenomenon.
  3. What is a hysteresis curve and how will it be affected with increase in load beyond the yield point?
  4. What role will addition of carbon play on the yield strength and ultimate strength?
  5. What are the ASTM standards followed during specimen preparation while testing a material for tensile strength?
  6. Why do we need a strain gage or extensometer to measure the elongation rather than the movement of the UTM cross head?
  7. How does the strain rate affect stress strain curve of a material?
  8. How would a compressive stress strain curve vary from a tensile stress strain curve?
  9. What are the benefits of photoelastic methods over strain gage techniques for strain measurement?
  10. What is the reason behind strain hardening region in the tensile stress strain curve?
  11. Do you think the metal’s temperature will rise when subjected to a destructive tensile test? Why so?
  12. Do you think the metal’s temperature will rise when subjected to a destructive tensile test? Why so?
  13. How will the thermal effects influence the readings from the Quarter Bridge strain gages?
  14. How will the strain gages reading effect with lead wire length?
  15. You can close a soda bottle with a rubber cock, what property of the rubber cock is responsible for this?
  16. Draw a superimposed stress strain curve at elevated temperature on the experiment graph.
  17. What are the likely sources of error while determining the Poisson’s ratio on UTM?

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