Curved beam stress calculation problem

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Discussion Overview

The discussion revolves around calculating stress in a curved beam and comparing the results with those obtained from Finite Element Analysis (FEA) models. Participants are sharing their experiences with discrepancies between hand calculations and FEA results.

Discussion Character

  • Homework-related
  • Debate/contested

Main Points Raised

  • One participant used the formula Stress = (M*(r-rn))/(Aer) to calculate stress in a curved beam, obtaining a result of 9.5 MPa, while the FEA result was over 500 MPa, leading to confusion about the discrepancy.
  • Another participant reported a similar issue, with hand calculations yielding 12 MPa and Ansys results showing 400 MPa, indicating a consistent problem among users.
  • A suggestion was made to start a new thread for clarity and to provide full information about the problem and calculations.
  • A note was made regarding the sharing of email addresses on the forum, advising participants to remove them for privacy reasons.

Areas of Agreement / Disagreement

Participants generally agree on the existence of significant discrepancies between hand calculations and FEA results, but the reasons for these differences remain unresolved. Multiple competing views and experiences are presented without consensus.

Contextual Notes

Participants have not provided full details of their calculations or the specific parameters used in their FEA models, which may be relevant to understanding the discrepancies.

Aerstz
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Homework Statement



Calculate stress in a curved beam and compare with FEA model.

Homework Equations



Stress = (M*(r-rn))/(Aer)

The Attempt at a Solution



I used the above formula, which is repeated in many textbooks and reputable engineering websites, to calculate stress in a curved beam. My result was 9.5 MPa, but the FEA result was over 500 MPa (see attached image).

I've checked my calculations and I'm convinced I haven't made a mistake. I really do not know why there is such a large disagreement between my calculations and the FEA result. I have repeated the FEA process several times and in different ways but the disagreement is constant.

If anyone knows what is going wrong here please tell me!
 

Attachments

  • curved beam.jpg
    curved beam.jpg
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Hello Aertsz

I have a same problem with you.İn Curved Beams there is something I can not achieve.My Hand Calculation is 12 MPA My Ansys result is 400 MPA.If you found the reason or solution please share me?

My email: tehc21@gmail.com
 
This is an old thread . Best to start a fresh one .

Please post full information about the problem in the new thread and show us your attempt at calculations .
 
nb : Showing Email addresses openly on forum is not advisable . Delete yours asap .
 

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