User`s guide

35
Uncertainty Analysis
The parameters in Table 2 are used to perform uncertainty analysis for characterized
internal pressure. The detailed process of the analysis is included in the appendix.
Parameter
Value
Uncertainty
Young's Modulus (psi)
  

  

Poisson's Ratio
0.35
0.005
Thickness (in)
0.005
  

Radius (in)
1.300
  

Strain (micro strain)

3%
Table 2 Initial Parameters for Uncertainty Analysis
The uncertainty for measured pressure is constant at 10.4% when strain is within the
specified range. The percentage contributions of each variable (when strain = 900 micro strain)
are listed in the table below.
Parameter
Contribution to Uncertainty
Thickness
91.63%
Strain
8.25%
Poisson's Ratio
0.084%
Radius
0.034%
Young's Modulus
0.009%
Table 3 Percentage contribution to uncertainty