What is the density of a constant? (spring constant)

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SUMMARY

The discussion centers on the concept of the density of a constant, specifically the spring constant, also referred to as the stiffness constant. Participants explore the relationship between Young's modulus and the spring constant, emphasizing that the ratio of Young's modulus (Y) to length (L) can be interpreted as a density related to the distribution of infinitesimal springs along a given length. The conversation also touches on the application of these concepts in biomechanics, particularly in the context of tooth movement and intervertebral disks.

PREREQUISITES
  • Understanding of Young's modulus in material science
  • Basic knowledge of spring mechanics and constants
  • Familiarity with biomechanical principles related to tooth movement
  • Mathematical proficiency in calculus and ratios
NEXT STEPS
  • Study the relationship between Young's modulus and spring constants in detail
  • Research the mathematical modeling of intervertebral disks in biomechanics
  • Explore the theorem of reciprocal synostosis and its applications
  • Investigate density functions in the context of material properties
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Engineers, biomechanical researchers, dental professionals, and students interested in the mechanics of materials and their applications in biological systems.

zazi77
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Hi, I could you explain me what is the density of a constant (particurarly the spring constant, or should I say "stiffness" constant)? I guess it's a probability function but would like more details. I would like an answer that at first describe the concept and later refine the mathematical explanation . Thank you
 
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Welcome to the PF. :smile:

Can you post a couple links to where you have seen this?
 
I'm reading this paper written by an engineer(I'm a dentist passionate with biomechanics). From theorem of reciprocal synatrosis a theory of tooth movement has been derived (a constant of center of rotation based on stress distribution function of periodontal ligament). I can understand the calcultions more or less, but I'm curious about this density because I could
Schermata 2019-08-05 alle 18.42.59.png
find no explanation about it.
 
I guess the concept is more or less this one. In the first part of the paper an intervertbral disk is considered. It can be assumed to be a spring and each infinite element is a small spring . These little springs can be distributed in some ways, so that is it possible to define a "density". Moreover it also depends on the kind on model of disk (continuity, discontinuity). If you can explain me these concepts and link me something to study (for someone approaching the subject) it would be great.
 
Hi @zazi77
Here is a brief consideration on using Young's modulus as a spring constant, which is what the article is doing.
https://ccrma.stanford.edu/~jos/pasp/Young_s_Modulus_Spring_Constant.html
Note that F/S is pressure, where S is an area.
If you move S to the right hand side you have ΔL [ the dy ] times Y ( Young's Modulus ) / L( length) times S(area)

If you consider upon the Y/L as a density, that is related to the number of little springs that are in the total length L, and acting upon the area.

Maybe someone can explain that better.
 
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thank you for your reply, I already saw that link. What I don't get is why Y/L is a density
 
Please give us a reference to the source of the .png in post #3.

Do you also have a download link ?
 

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