Uncovering the Correlation of Wire Creep and Temperature

In summary, the amount of creeping in thin wires at high temperatures can be approximated by various models that take into account stress, time, and temperature. One simple model is the time hardening model, which considers strain in the primary and secondary phases of deformation. More in-depth information can be found in books such as "Fundamentals of Creep in Metals and Alloys" by Michael Kassner, or by analyzing creep curves specific to the loading situation.
  • #1
silver-rose
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Wire "Creeping"

Thin wires tend to creep (extend longer over periods of time), particulary at high temperatures.

Is there a "formula" that explains this correlation of the amount of creeping with regards to temperature or other factors?
 
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  • #2
Yes.

There are many models which attempt to approximate creep, most involve considerations of stress, time, and temperature. One of the simplest is a time hardening model, which addresses the strain in the primary and secondary phases of deformation, where creep rate decreases with increasing strain due to strain hardening of the material:

ε = a σ^b t^n

Here, ε is the strain, σ the stress, t the time, and b and n constants. Differentiate with respect to time to get a creep strain rate.

Anything more in depth you can probably get by hanging around for Astronuc, or alternatively by reading "Fundamentals of Creep in Metals and Alloys" by Michael Kassner, you probably need a good understanding of the phenomena involved in order to select an appropriate model to use.
 
  • #3
Or you can try to find a creep curve that is close to your loading situation and read it directly off a chart. Examples are usually something like these:

www.tech.plym.ac.uk/sme/mats340/cpdata.pdf
 

1. What is wire creep?

Wire creep refers to the gradual deformation or elongation of a wire under a constant load or stress. This phenomenon occurs over time and can be influenced by various factors such as temperature, material composition, and applied load.

2. Why is it important to study the correlation between wire creep and temperature?

Understanding the correlation between wire creep and temperature is important because it can help predict the lifespan and performance of wires in various applications. Temperature can significantly affect the rate of wire creep, and studying this correlation can provide valuable insights for designing and selecting wires for different environments.

3. How is the correlation between wire creep and temperature measured?

The correlation between wire creep and temperature is typically measured through experiments where a wire is subjected to a constant load or stress at different temperatures. The resulting elongation or deformation of the wire is then recorded and analyzed to determine the extent of wire creep at each temperature.

4. What are some common factors that can influence the correlation between wire creep and temperature?

Apart from temperature, other factors that can influence the correlation between wire creep and temperature include the type and composition of the wire material, the magnitude and duration of the applied load, and the environment in which the wire is being used. These factors can all impact the rate and extent of wire creep.

5. Can the correlation between wire creep and temperature be used to predict the lifespan of a wire?

While the correlation between wire creep and temperature can provide valuable information about the behavior of wires, it should not be solely relied upon to predict the lifespan of a wire. Other factors such as mechanical stresses, corrosion, and wear can also affect the lifespan of a wire. Therefore, a comprehensive analysis of all these factors is necessary to accurately predict the lifespan of a wire.

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