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Comparing QUB_coupling With Other Coupling Techniques




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A comparison is made between the Coupling Technique formulated at Queen's and other techniques available. Conventionally, element types of different dimension are coupled together using Rigid Links. Rigid links don't allow the component to deform according to the theory of elasticity, so disturbances to the displacement and stress patterns are created at the interface between differing element types. In AbaqusTM, this is achieved using the *KINEMATIC COUPLING command in the analysis. HKS have also come up with a coupling technique which allows deformation to occur at the interface, it is implemented with the *DISTRIBUTING COUPLING command, together with a dcoup3d element at the interface. In the screen captures below, the same contour scales were used for each load type, so valid comparisons can be made.
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QUB Coupling Technique
Coupling using Rigid Links
Abaqus(DCOUP3D) Technique

QUB Coupling: Axial Stress (Von Mises)

Rigid Links: Axial Stress (Von Mises)

Abaqus Coupling: Axial Stress (Von Mises)

QUB Coupling: Bending Stress (Von Mises)

Rigid Links: Bending Stress (Von Mises)

Abaqus Coupling: Bending Stress (Von Mises)

QUB Coupling: Shear Stress due to shear force in x-direction (txz)

Rigid Links: Shear Stress due to shear force in x-direction (txz)

Abaqus Coupling: Shear Stress due to shear force in x-direction (txz)

QUB Coupling: Shear Stress due to shear force in x-direction (tyz)

Rigid Links: Shear Stress due to shear force in x-direction (tyz)

Abaqus Coupling: Shear Stress due to shear force in x-direction (tyz)

QUB Coupling: Stress due to axial torque (Von Mises)

Rigid Links: Stress due to axial torque (Von Mises)

Abaqus Coupling: Stress due to axial torque (Von Mises)



The Abaqus Dcoup element can give marked improvements if the correct weightings are applied to the nodes at the interface. A comparison is made between the QUB coupling technique and the Abaqus technique when the correct weights are used in their analysis.



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