# Stress Analysis of Instrumented Pressure Vessel (IPV) Subjected to External Pressure.

**
The IPV shown below was subjected to an external pressure of 1000 psi (6.9 mPa),and FEA analyzed using
SolidWorks Simulation. 1000 psi is equal to a seawater depth of 2250ft (686m). The FEA Analysis shows
that the average stress in the pressure tube is about 10700 psi (73.8 mPa), and the average stress at the center of
the end cap is about 11400 psi (78.6 mPa). The highest stress of 24957 psi (172 mPa) is the result of a singularity at
the corner between the IPV inner diameter (ID) and the o-ring surgace ID. The pressure rating is limited by the O-Rings, which are rated at 1500 psi (10.3 mPa).
**

#### Pressure Vessel FEA using SolidWorks.

#### External Pressure = 1000 PSI (6.9 mPa)

#### Stress Calculation using MapleSoft

#### with Roark Equations. External Pressure = 1000 psi (6.9 mPa)

**
Using MapleSoft with Roark equations to calculate IPV stress is quicker than creating a SolidWorks model of the
IPV and subjecting it to an FEA analysis. This method is useful when all that is needed is a quick estimate of IPV
stress levels without the rigor of an FEA analysis. The stress values shown below at 1000 psi agree with the FEA
stress values shown above. **

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