Rosetta gauge for stress strain

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SUMMARY

The discussion centers on calculating principal strain and stress using a Rosetta gauge, with a Poisson's ratio of approximately 0.3. A participant reported a discrepancy of 100 microstrain compared to classmates, which was traced back to a calculation error involving the incorrect application of brackets in the formula. The correct calculation for the first element should yield 183 instead of 357. This highlights the importance of proper mathematical operations in strain calculations.

PREREQUISITES
  • Understanding of principal strain calculations
  • Familiarity with Poisson's ratio and its application
  • Basic knowledge of stress-strain relationships
  • Proficiency in using calculators for mathematical operations
NEXT STEPS
  • Review the principles of strain measurement using Rosetta gauges
  • Study the impact of Poisson's ratio on material behavior
  • Learn about common errors in strain calculations and how to avoid them
  • Explore advanced stress-strain analysis techniques
USEFUL FOR

Engineering students, materials scientists, and professionals involved in stress analysis and strain measurement will benefit from this discussion.

Mechaman
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Homework Statement


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Homework Equations


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The Attempt at a Solution


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I'm trying to find the principal strain, then from that find stress. The poisons ratio should be around 0.3 for this experiment. My result is about 100 micro strain higher than what my class mates got. Can anyone see where I'm going wrong?
 

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In the first element of your calculation you give the result of : (348 + 18) /2 to be 357; the result should be 183.
 
JBA said:
In the first element of your calculation you give the result of : (348 + 18) /2 to be 357; the result should be 183.
Amazing, I forgot to enclose the whole top line with brackets on my calculator and divide by 2. Thanks a lot for looking over it and seeing that.
 

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