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*Taper |
 
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*Taper
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*Taper |
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To assign properties to a set of elements that collectively comprises a tapered stress joint, typically in a model of a rigid riser.
Refer to Tapered Joints for further information on this feature.
A block of lines repeated as many times as necessary.
SET=Set Name
E, G, rho, Dis, Dos, Doe [, Die, Dbs, Dbe, DDs, Dde ]
[COMPRESSION CHECK=Check Setting]
The first six values must be specified. Defaults are calculated for any of the other five if omitted. Check Setting may be either AUTOMATIC (the default), NONE or a numeric value.
Input: |
Description |
Set Name: |
The name of the set comprising the tapered stress joint. |
E: |
The Young’s Modulus for the elements of the set. |
G: |
The shear modulus for the elements of the set. |
rho: |
The mass density (mass per unit volume) of the material of the set. |
Dis: |
The riser internal diameter at the start of the tapered stress joint. Dis is used in computing the buoyancy contribution of the internal fluid, if there is any. |
Dos: |
The riser outer diameter at the start of the tapered stress joint. This is used in computing the area, moment of inertia and polar moment of inertia for the elements of the set. |
Doe: |
The riser outer diameter at the end of the tapered stress joint. Riser outer diameter is assumed to vary linearly between Dos and Doe. |
Die: |
The riser internal diameter at the end of the tapered stress joint. This entry is optional, and defaults to Dis. The default value will apply in the vast majority of applications. |
Dbs: |
The buoyancy diameter at the start of the tapered stress joint. This is the effective outer diameter for buoyancy force calculations. This entry is optional, and defaults to Dos. |
Dbe: |
The buoyancy diameter at the end of the tapered stress joint. This entry is optional, and defaults to Doe. Buoyancy diameters at intermediate locations are found by linear interpolation between Dbs and Dbe. |
Dds: |
The drag diameter at the start of the tapered stress joint. This is the effective outer diameter for hydrodynamic force calculations. This entry is optional, and defaults to Dos. |
Dde: |
The drag diameter at the end of the tapered stress joint. This entry is optional, and defaults to Doe. Drag diameters at intermediate locations are found by linear interpolation between Dds and Dde. |
Compression Check: |
Flexcom will issue a warning if the compressive load experienced in any element exceeds the critical Euler load. Refer to Compression and Buckling for further information. The options are Automatic (the default), Manual and None. If you opt for Manual, you must explicitly set a Compression Limit also. |
Compression Limit: |
A manually defined compression limit to be used in the Euler load check. |
(a)The procedure when using this option to define the properties of a tapered stress joint is as follows. You first define an element set for the stress joint, and then complete the specification by inputting the actual joint properties and dimensions here. This means that all the geometric properties for the elements of the set are specified here. Unlike the case of a bend stiffener, the properties you specify here are not additional to properties defined using the *GEOMETRIC SETS keyword. Indeed, it is an error to assign properties to elements using both the *GEOMETRIC SETS and *TAPER keywords.
(b)You must specify non-zero values for E, G, rho, Dos and Doe, and a non-zero value for Di would also be normal. All of the other inputs are optional.