FEA used to calculate stress and deflection in a field artillery piece used by Napoleon and in the US civil war

1. Napoleonic 12 pound canon
barrel FEA stress analysis
11/9/17 rev A
Don Blanchet
3B Associates
dwb3298@verizon.net
Prepared for:
US-M39143-1043

2. Solidworks model
This Photo by Unknown Author is
licensed under CC BY
Muzzle velocity 1500 ft/sec

3. Barrel model
Material cast iron

4. Meshed FEA model
1,500,000 degrees of freedom

5. Loads and supports internal
pressure in rifled barrel

6. Stress contours, psi
section through centerline

7. Barrel deflection ~.020 inch

8. Observations
 Barrel deflection needs to be
compensated in sighting.
 Ship roll during repeated broadside
firing would be orders of magnitude
greater.
 World war I ships introduced
gyroscopic gun mount stabilization.