Comparing stress-strain curves from different methodologies

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Discussion Overview

The discussion revolves around the comparison of stress-strain curves derived from different methodologies in the context of studying the physical characteristics of arteries. Participants explore the implications of differing dimensions and testing methods on the comparability of these curves, focusing on both artificial and natural arteries.

Discussion Character

  • Debate/contested
  • Technical explanation
  • Experimental/applied

Main Points Raised

  • One participant questions whether stress-strain curves can be compared given differences in dimensions and methodologies between their study and others.
  • Another participant suggests referring to ASTM methods for material testing as a way to assess the comparability of the data.
  • A participant expresses difficulty in accessing ASTM standards and requests specific references or documents to aid their understanding.
  • One suggestion is made to repeat both experiments for a definitive conclusion, or to conduct a proper stress analysis of both test samples.
  • A participant mentions that finite element analysis (FEA) could provide a sophisticated approach to analyzing the problem.
  • Clarification is provided that the participant is testing an artificial artery and comparing it to a study on a natural artery, which used burst pressure testing.
  • Another participant describes FEA as a powerful tool for analyzing technical problems and shares a link to examples of its medical applications.

Areas of Agreement / Disagreement

Participants express differing views on the comparability of stress-strain curves based on methodology and dimensions, with no consensus reached on the best approach to resolve these issues.

Contextual Notes

Participants note limitations related to the availability of ASTM standards and the challenges in accessing relevant literature, which may affect the discussion's depth and clarity.

keno.mentor
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I am a medical researcher with little physics background but currently completing a study of the physical characteristics of arteries.

I am trying to compare the stress-strain curve from my study with that of other studies. The problems are 1) the dimensions of the arteries in these other studies are slightly different from mine and 2) the methodology is different.
Can the stress-strain curves be compared? Does the calculation of stress (in KPa) and strain (dimensionless) take these differences into account such that these curves are comparable?

To elaborate:
I derived a S-S curve by circumferential stretch of a 1cm segment of 5mm diameter tube.
The comparable study took a 10cm segment of 4mm diameter tube, tied off the one end and subjected it to increasing fluid pressure. Is it reasonable to compare the S-S curves (and Young's moduli) derived from these 2 studies and make a general statement of how these 2 materials differ or are similar?
 
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This is precisely why there are ASTM methods for testing materials. Google the ASTM method, and then look at the methodologies for the two cases compared to the ASTM method. If everything seems reasonable, then you can probably be safe to compare data.
 
Thanks for the reply Kevin.

I haven't been able to find anything that helps me though - ASTM standards is a bit of a rabbit hole and most of the articles need to be paid for.

Unless you can point me to a specific reference or document?
 
Ideally repeat both experiments and come to a definite conclusion .

Otherwise do a proper stress analysis of both test samples .

Hand calculation would probably give adequate results .

FEA would not be too difficult if you wanted more sophistication .
 
Thanks Nidum.

To clarify: I am testing an artificial artery, which I am analysing in the way I described above (circumferential stretch). I am trying to compare this data to another group's study, which tested a 'natural' artery with burst pressure testing.

Could you expand on 'FE models'?
 
http://www.ansys.com/-/media/Ansys/corporate/images/about/magazine/AA-V1-I1-Full-Version.pdf
 

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