Flexible element is a two-node flexible element, that can be used for modeling of expansion bellows or flexible hoses. In the one-node expansion joints the deformation are modeled in the point (zero length expansion joint), but the two-node element is a finite length beam. The bending stiffness for two-node flexible element should be specified 4 times greater than for zero length expansion joints.
Property |
Description |
Name |
Text field. Element can be sorted by name and selected in the project tree |
Projections\sphere\cylinder^{1} |
Projections - element dimensions
are input as projections on global coordinate
axes D_{X},
D_{Y}, D_{Z}; |
Axial Stiffness, Shear Stiffness, Torsion Stiffness, Bending Stiffness |
Axial Stiffness - E*A Shear Stiffness - G*Ay и G*Az Torsion Stiffness - G*It Bending Stiffness - E*Iy и E*Iz E - Elastic Modulus, G - Shear Modulus, A - cross section area, Ay, Az - Effective Shear Area, It - torsion moment of inertia, Iy, Iz - moment of inertia Shear Stiffness and Bending Stiffness automatically calculated depending on each other by equation: KL=KR*3/L^2 и KR=KL*L^2/3, where KR=EI - Bending Stiffness KL=GA - Shear Stiffness Bending stiffness KR of two-node flexible element should be specified four times greater than KR value for zero length expansion joints. Below is shown models of two types of flexible elements а - two-node flexible element (flexible beam) and b - zero length flexible element. Two node flexible element can have a deflection D, but zero length expansion joint can't deflect (D=0). The rotation angle of the model (a) will be 4 times greater than of the model (b) from the same applied moment M q2=4*q1, therefore the rotation stiffness KR will also be 4 times greater. KR of two-node flexible element = 4*KR of zero length expansion joint Therefore, the bending stiffness provided in the manufacturer catalogues should be multiplied by 4 when using in the two-node flexible element. |
Thrust Area |
Thrust area is used to model the pressure thrust forces in flexible pipe. For pressure balanced expansion joints it should be zero |
Total weight |
Total weight of the element |
Uniform weight |
Uniform weight of the flexible element |
To insert a flange, select the desired node and use the menu option: Insert > Flexible Element
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