Sidewall Pressure |
 
|
Sidewall Pressure |
|
Sidewall pressure is computed based on effective tension and curvature.
(1)
where:
•PSW is sidewall pressure
•Teff is effective tension
•Κy and Κz are the curvatures about the local y- and z-axes, respectively. These are combined to produce curvature at a particular angle around the element circumference, as outlined below.
Sidewall pressure has units of force/length (e.g. N/m, lbf/ft).
By default, Flexcom outputs the maximum sidewall pressure occurring on the cross section, based on the location of maximum curvature. However, when you request a plot of sidewall pressure, you can optionally specify a location around the element circumference where sidewall pressure is to be computed. The location is specified in terms of an integer value (N) which corresponds to an angle θ, measured in degrees anti-clockwise from the local element cross-section y-axis. The table below indicates the variation of parameter N with θ for sidewall pressure calculations.
Location Parameter for Sidewall Pressure Calculations
θ° |
N |
0 |
1 |
45 |
2 |
90 |
3 |
135 |
4 |
180 |
5 |
225 |
6 |
270 |
7 |
315 |
8 |
If you do not explicitly specify a location N, Flexcom outputs the maximum sidewall pressure occurring on the cross section. The location of maximum curvature is given by:
(2)
Flexcom calculates maximum sidewall pressure by substituting the θ value from Equation (2) into Equation (1) .