This article contains FAQ related to Design Request elongation settings.
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FAQ
How do pressure and temperature elongation settings affect the results in CSiPlant?
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For each design check stress category (except Pressure), the elongation settings are used to provide control for how Reference pressure and temperature loads are included (or not) in the analysis design results. The following behavior should be expected:
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- As no elongation loads are considered in analysis, a manual calculation is necessary to include the longitudinal pressure/temperature stresses if requested by code.
- Unless specifically directed otherwise by the design code (some codes absolute different stress components), manually calculated longitudinal stresses will be combined with other axial stress the following have the following sign convention:
- Internal pressure causes a positive average hoop stress, which generates a longitudinal contraction due to Poisson effect. When the contraction is restrained, a positive (tensile) longitudinal stress develops.
- Internal pressure causes a positive (tensile) longitudinal stress due to End-cap/Pressure Thrust.
- External pressure causes a negative average hoop stress, which generates a longitudinal elongation due to Poisson effect. When the elongation is restrained, a negative (compressive) longitudinal stress develops.
- External pressure causes a negative (compressive) longitudinal stress due to End-cap/Pressure Thrust.
- Operating Temperature greater than ambient causes a longitudinal elongation due to Thermal expansion. When the elongation is restrained, a negative (compressive) longitudinal stress develops.
- Operating Temperature less than ambient causes a longitudinal contraction due to Thermal expansion. When the contraction is restrained, a positive (tensile) longitudinal stress develops.
Elongation Enabled
- The design results automatically include the effects of pressure/temperature loads from analysis.
- A manual stress check is not performed if the corresponding elongation setting is enabled. This avoids the potential of double counting the longitudinal stress due to pressure or temperature.