Research Article
Numerical Investigations on Characteristics of Stresses in U-Shaped Metal Expansion Bellows
Table 1
Different design parameters.
| Design parameters | Notations | Specifications |
| Expansion joint material | | SA-240 321 | Material UNS number | | S32100 | Bellows design allowable stress | | 129.65 N/mm2 | Bellows ambient allowable stress | | 137.89 N/mm2 | Bellows yield stress | | 157.39 N/mm2 | Bellows elastic modulus at design temp. | | 183090 N/mm2 | Bellows elastic modulus at ambient temp. | | 195121 N/mm2 | Poisson’s ratio | | 0.300 | Bellows material condition | | Formed | Design cycle life, required number of cycles | | 7000 | Design internal pressure | | 1.099 N/mm2 | Design temperature for internal pressure | | 190°C | Bellow type | | U-shaped | Bellows inside diameter | | 131.000 mm | Convolution depth | | 8.000 mm | Convolution pitch | | 8.000 mm | Expansion joint opening per convolution | | 0.2985 mm | Total number of convolutions | | 10 | Nominal thickness of one ply | | 0.300 mm | Total number of plies | | 3 | End tangent length | | 13.000 mm | Fatigue strength reduction factor | | 1.500 |
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