  High temperature REBCO superconducting tapes are very promising for
high-field magnets. Under high magnetic fields there are high
electro-mechanical forces, and thus concern for mechanical damage. Due to large
screening currents and composite structure of the tape, the mechanical design
of these magnets is not straightforward. In addition, many contemporary designs
use insulated winding. In this work we develop a novel two-dimensional
axisymmetric finite element tool programmed in MATLAB that assumes the
displacement field within linear elastic range. The stack of pancakes and a
large number of REBCO tape turns are approximated as an an-isotropic bulk
hollow cylinder. Our results agree with uni-axial stress experiments in
literature, validating the bulk approximation. Here, we study the following
configuration. The current is first ramp up to below the critical current and
we calculate the screening currents and the forces that they cause using the
MEMEP model. As a case study, 32 T REBCO superconductor magnet, is taken and
simulated numerically. We have done complete mechanical analysis of the magnet
by including the axial and shear mechanical quantities for each pancake unlike
previous work where only radial and circumferential quantities are focused.
Effect on mechanical quantities without screening current is also calculated
and compared. It is shown that including screening current induced field
strongly affect the mechanical quantities, specially the shear stress. The
latter might be the critical quantity for certain magnet configurations.
Additionally, in order to overcome high stresses, a stiff over banding of
different material is considered and numerically modelled which significantly
reduces the mechanical stresses. The FE based model developed is efficient to
calculate the mechanical behaviour of any general superconductor magnet and its
devices.
