I'm trying to understand compressive strength and Euler stress for columns

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Discussion Overview

The discussion revolves around understanding the concepts of compressive strength and Euler stress in the context of columns, specifically addressing their implications for column failure modes. Participants explore the relationship between these two stress measures and their significance in structural engineering.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants note that a column with a compressive strength of 220MPa and an Euler yield stress of 350MPa indicates that it will fail due to compression before it buckles.
  • There is a reiteration that compressive strength refers to the resistance against downward forces, while Euler stress relates to the resistance against lateral buckling.
  • One participant expresses confusion over the terminology, suggesting that compressive strength and Euler stress are not the same despite both containing the term "stress."
  • Another participant mentions that the reading material equates compressive strength with critical stress for columns, raising questions about the definitions used.
  • A participant proposes that the terms "force aligned with" or "perpendicular to the main axis of the column" might provide a clearer understanding of the forces acting on columns.

Areas of Agreement / Disagreement

Participants generally agree on the distinction between compressive strength and Euler stress, but there is some confusion regarding their definitions and applications. The discussion remains unresolved regarding the implications of the numerical values provided and their normalcy in practical scenarios.

Contextual Notes

There are limitations in the discussion regarding the assumptions made about the definitions of compressive strength and Euler stress, as well as the context in which these values are applied. The relationship between the two stress measures and their implications for column design is not fully clarified.

lee123456789
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A cloumn has a compressive strength of 220MPa, but its Euler yeild stress is 350MPa. its compressive strength is less than its euler stress.
what does this mean?
 
Last edited:
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That the column will fail due to compression before it can buckle.
 
FEAnalyst said:
That the column will fail due to compression before it can buckle.
The compression strength is the downward forces applied resistances.

so it will fail dowards before it will fail sideways basically?
 
lee123456789 said:
The compression strength is the downward forces applied resistances.

so it will fail dowards before it will fail sideways basically?
https://dailycivil.com/types-column-failure/

1619790220118.png


1619790245884.png
 
berkeman said:
https://dailycivil.com/types-column-failure/

View attachment 282277

View attachment 282278
Thanks
i was getting comfused because both had stress in them so thought it was the same
compressive strength = downward stregth resistance
Euler Stress = sideways to buckling

so by looking at the strength (220) and euler stress (350), it buckles higher than it does when compressing the column.
220 - 350 = 130MPa
is that normal for column?
 
in the reading material it uses compressive strength as the same value they use for critial stress for the column.
 
lee123456789 said:
Thanks
i was getting comfused because both had stress in them so thought it was the same
compressive strength = downward stregth resistance
Euler Stress = sideways to buckling
Force aligned with or perpendicular to the main axis of the column could be more accurate terms, since we not always have a vertical column that is supporting a load on top of it.
 

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