- #31
oxon88
- 176
- 1
post #13 has the correct figures.
Column Loading Analysis: Strain and Stress Graph for Tubular Support
Click For Summary
Discussion Overview
The discussion revolves around the analysis of strain and stress in a tubular column under load, specifically focusing on the calculations and graphing of expected strain against applied load. The context includes homework-related queries and technical calculations involving material properties and strain gauge orientation.
Discussion Character
- Homework-related
- Technical explanation
- Debate/contested
Main Points Raised
- Participants discuss the calculation of force, normal stress, normal strain, and transverse strain for a tubular column under varying loads from 0 to 500 kg.
- Some participants propose using the modulus of elasticity as 250 GN/m² and apply it in their calculations, while others correct or refine earlier claims regarding the sign conventions for stress and strain.
- There is a debate about whether the transverse strain should be positive or negative, with references to the Poisson's ratio and the relationship between longitudinal and transverse strains.
- One participant suggests that the strain gauge could be mounted at a 45° angle to potentially provide greater strain, raising questions about the orientation's effect on measured strain.
- Participants share numerical results for stress and strain calculations, with some expressing confusion over the sign conventions used for stress and strain values.
- There are inquiries about the reasonableness of calculated changes in the outside diameter, inside diameter, and column length based on the strain values obtained.
Areas of Agreement / Disagreement
Participants express differing views on the sign conventions for stress and strain, with some agreeing on the definitions while others challenge the correctness of the values presented. The discussion remains unresolved regarding the optimal orientation of the strain gauge and its effect on strain measurement.
Contextual Notes
Limitations include potential misunderstandings of strain gauge orientation effects, unresolved sign conventions for stress and strain, and dependencies on specific definitions that may not be universally agreed upon.
Who May Find This Useful
Students and practitioners interested in structural analysis, materials science, and the practical application of strain gauges in engineering contexts may find this discussion relevant.
- #32
Big Jock
- 100
- 0
Thanks, and this part...
show how four strain gauges can be used in
conjunction with a Wheatstone bridge to give maximum sensitivity
of the load measurement system.With the aid of sketches show how four strain gauges can be used in
conjunction with a Wheatstone bridge to give maximum sensitivity
of the load measurement system. Show clearly the orientation of the
strain gauges on the tubular column and the positioning of these
gauges on the Wheatstone bridge
show how four strain gauges can be used in
conjunction with a Wheatstone bridge to give maximum sensitivity
of the load measurement system.With the aid of sketches show how four strain gauges can be used in
conjunction with a Wheatstone bridge to give maximum sensitivity
of the load measurement system. Show clearly the orientation of the
strain gauges on the tubular column and the positioning of these
gauges on the Wheatstone bridge
- #33
oxon88
- 176
- 1
take a look here: http://www.omega.com/faq/pressure/pdf/positioning.pdf
for this question, i explained how the circuit works and what the benefit is using the wheatstone bridge circuit. look at figure D in particular for the positioning of the strain gauges.
for this question, i explained how the circuit works and what the benefit is using the wheatstone bridge circuit. look at figure D in particular for the positioning of the strain gauges.
- #34
Big Jock
- 100
- 0
quick couple of questions and many thanks so far.
Have you had this all marked??
Also the table in post#13 are the same values I had calculated for the graph of the expected strain against the applied load. How do these work then for the graph of strain against applied load when the strain gauge is in
the new position?? Just a bit confused?
Have you had this all marked??
Also the table in post#13 are the same values I had calculated for the graph of the expected strain against the applied load. How do these work then for the graph of strain against applied load when the strain gauge is in
the new position?? Just a bit confused?
- #35
oxon88
- 176
- 1
yes it has been marked as correct. I achieved distinction grade.
for the first graph, it wil be Transverse Strain Vs Load
for the second, it will be Longitudinal Strain Vs Load
for the first graph, it wil be Transverse Strain Vs Load
for the second, it will be Longitudinal Strain Vs Load
- #36
Big Jock
- 100
- 0
Magic Oxon88 and well done some of these questions are tough to say the least. I will keep working away and try and get it all done. Many thanks for your help. Hopefully in the future I will be able to repay the favour...
- #37
Big Jock
- 100
- 0
Oxon could you upload the Longitudinal Strain Vs Load graph please
- #38
oxon88
- 176
- 1
- #39
Big Jock
- 100
- 0
Thanks Oxon88 for your great help
- #40
Big Jock
- 100
- 0
Your graph Oxon what have you used for the x axis?
Last edited:
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