Seeking Real Life Cases: Influence of Temperature on Young's Modulus

[Syphax Zennouche]

Hello everyone,

I am currently working on a research project where I have developed a neural network model to predict the Young's modulus of materials at different temperatures. To enhance the presentation of my model, I am searching for real life examples where engineers have neglected or underestimated the influence of temperature on this property, resulting in critical problems.

I believe that sharing such case studies will help illustrate the significance of considering temperature effects in engineering and highlight the importance of accurate modeling and analysis. If you are aware of any incidents or scenarios where the oversight of temperature's impact on Young's modulus led to undesirable consequences, I would greatly appreciate your insights.

Please provide a brief description of the case, including the industry or field, the specific problem or failure, and the implications caused by the underestimation or neglect of temperature effects on Young's modulus.

Thank you in advance for your contributions. Your input will be valuable for enhancing the understanding and awareness of this critical aspect in engineering design and decision-making.

Best regards!

 

[SWComposites]

The most likely issue that could be caused by neglecting temperature effects on moduli are buckling related, and you are unlikely to find many if any of those.
Much more likely to find issues caused by temperature effects on strength properties.

 

[driftLimiter]

If I'm not mistaken a concern with reinforced concrete exposed to fire for long durations is the relaxation of the reinforcement (i.e. variation of youngs modulus).
I think there was a fire under a bridge in atlanta that caused a collapse for this reason a few years ago you could look into.

Its up to you to:

Please provide a brief description of the case, including the industry or field, the specific problem or failure, and the implications caused by the underestimation or neglect of temperature effects on Young's modulus.

We're not here to do the work for you, but we can point you in the direction.

 

[rb1957]

but isn't that about the steel being heated, then thermal strains relaxing the preload ?

"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.

 

[driftLimiter]

I have naïvely assumed that it was mild reinforcement. Perhaps OP's literature study will enlighten me.

 

[Syphax Zennouche]

I'm looking for an example like the one of the bridge, but for a kind of mechanical component/system (like engine).

 

[rb1957]

as we've said temperature doesn't really affect E for metals ... it does affect strength (and mode of failure, so ductility)

that said I found this. If you want more, you can find the book on line ... MMPDS (don't worry about the number) or Mil Hdbk 5

"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.

 

[dik]

The most notable is a steel structure after a fire, with the steel beams hanging like strands of spagetti. As temperature goes up, both the yield and Es values drop drastically.

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[dik]

Tacoma was a dynamic issue, not a thermal one.

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[rb1957]

Jennifer, please explain why you think there were thermally induced changes in structural properties (particularly E) as the OP has asked about ?

Similar to dik's observation that Tacoma Narrows was not a thermal problem.

"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.

 

[SWComposites]

JJ sounds like ChatGPT generated nonsense ……..

 

[3DDave]

The failure of the space shuttle Challenger due to the stiffening of the o-ring is an example.

 

[rb1957]

yeah, rubber is a pretty unique material. It'd be nice to know the OP's field of interest ... metals, composites (like Carbon, Kevlar), RC, organics (like Rubber) ...

"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.

 

[Rohan Sen]

The influence of temperature on Young's Modulus is an interesting topic that has been studied by scientists and engineers in various fields. Real-life cases can provide valuable insights into the impact of temperature on the mechanical properties of materials.

One example of a real-life case is the use of composite materials in aerospace applications. These materials are often subjected to extreme temperatures during flight, and understanding how their mechanical properties change as a result is critical for ensuring their reliability and safety.

 

[dik]

When I was a kid, I used to have an anelastic rubber ball with a huge hysteresis curve. I didn't know that at the time. It was neat... like a superball, but wouldn't bounce very much... maybe a few inches.

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[dik]

Catch the thread

thread815-507741

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[rb1957]

but isn't that more about the loss of strength ?

"Hoffen wir mal, dass alles gut geht !"
General Paulus, Nov 1942, outside Stalingrad after the launch of Operation Uranus.

 

[dik]

both strength and stiffness...

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik