Indentation Formula: Calc w/o Vernier Caliper

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SUMMARY

The discussion centers on calculating the indentation made by a bullet upon impact with a target board without using a vernier caliper. Participants agree that no straightforward formula exists due to the complexity of the problem. However, an empirical formula could be developed if all relevant parameters, such as material properties, bullet speed, and impact area, are accurately known. The consensus emphasizes the need for predictable material behavior to derive a reliable calculation.

PREREQUISITES
  • Understanding of material properties and deformation mechanics
  • Knowledge of bullet dynamics, including speed and impact force
  • Familiarity with empirical formula development
  • Basic principles of physics related to impact and indentation
NEXT STEPS
  • Research material deformation models for various materials
  • Study bullet impact dynamics and energy transfer
  • Explore empirical formula derivation techniques in physics
  • Investigate case studies of indentation measurements in similar contexts
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Physicists, materials scientists, engineers, and anyone involved in ballistics or impact analysis will benefit from this discussion.

nata_eva
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Here is the problem, a bullet have been shoot from certain distance to the target board. when the bullet hit the board, it will make a small indent on it. Does anyone know what is the formula to calculate the indentation on the target board without have to measure the indentation using vernier caliper?
 
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There is no simple formula for such a complicated problem.
Although maybe one could up with an empirical formula if all the relevant parameters were known (material parameters, speed of the bullet, impact area etc) and only "simple" materials were used (material that deform in a reasonably predictable way over a large range of parameters).
 

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