How much thickness for sphere to withstand atmospheric pressure?

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SUMMARY

The discussion focuses on determining the necessary thickness of a hollow sphere made from a high elasticity constant material, such as steel, to withstand atmospheric pressure when the air inside is evacuated. The use of Lame's solution and Finite Element Analysis (FEA) is considered valid for quantifying the required thickness. The problem involves stability and buckling, highlighting the challenges of manufacturing a perfectly shaped sphere with uniform shell thickness and welds. Calculations must incorporate a generous safety margin to account for internal stresses and potential uneven deformation.

PREREQUISITES
  • Understanding of Lame's solution in elasticity theory
  • Familiarity with Finite Element Analysis (FEA) techniques
  • Knowledge of buckling theory and stability problems
  • Basic principles of material science, particularly regarding high elasticity materials
NEXT STEPS
  • Research Lame's solution applications in hollow sphere analysis
  • Explore advanced Finite Element Analysis software options for structural integrity testing
  • Study buckling theory in-depth, focusing on cylindrical and spherical shells
  • Investigate material properties of steel and alternatives for high-pressure applications
USEFUL FOR

Engineers, material scientists, and designers involved in structural integrity assessments, particularly those working with pressure vessels and high-stress applications.

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TL;DR
Hollow sphere withstanding the atmospheric pressure
Imagine a hollow sphere made of a material with high elasticity constant(e.g. steel). How much thickness should it have to prevent it from crushing when the air inside is pumped out?
Is it valid to use Lame solution to quantify the answer? What about Finite Element Analysis?
 
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This would be a stability problem involving buckling.
 
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