General expression for stress within cone.

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SUMMARY

The discussion focuses on deriving a general expression for stress within a truncated cone subjected to axial forces. The user attempts to relate the radii and height using similar triangles, leading to the expression for stress difference as F(1/A_a - 1/A_r), where A_x represents the surface area at radius x. The user expresses uncertainty about the validity of their approach and considers using integrals for a more precise solution. The conversation emphasizes the importance of understanding force distribution in conical structures.

PREREQUISITES
  • Understanding of basic mechanics of materials
  • Familiarity with stress and strain concepts
  • Knowledge of geometric properties of truncated cones
  • Basic calculus, particularly integration techniques
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  • Research the derivation of stress distribution in conical structures
  • Study the application of integrals in calculating stress in non-uniform cross-sections
  • Learn about the principles of axial loading and its effects on structural elements
  • Explore the use of finite element analysis (FEA) for stress evaluation in complex geometries
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Mechanical engineers, structural analysts, and students studying mechanics of materials who are interested in understanding stress distributions in conical shapes under axial loads.

peripatein
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Hello,
I am supposed to find an expression for the general stress wrt height within a truncated cone of lower and upper radii a and b (a>b), pulled down from its vertical axis by a force of the same magnitude as that pulling it up. The diagram implies that the height between the upper and lower base is h (see attached diagram).

Attempt at solution:
I did (a-b)/h = (a-r)/h' (since the slope is similar even at height h' from lower base of radius a),
From which I could find r and hence the difference in the stress: F(1/A_a - 1/A_r) where A_x denotes the surface area of radius x.

I am really not sure this is how it should be done. My initial inclination was to use integrals.
Should it indeed be done the way it is presented above? Please advise.
 

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I was hoping someone could possibly comment on my attempt at solution and advise how to solve this. Did I happen to post it to the wrong place?
 
The stress is just the force per unit area of cross-section, yes? So what you did sounds right. What actual equation did you get?
 

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