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(a) Reaction force of the load cell for the block test when the SMA torsion spring is heated. The RMSE is 0.0227N, and R2-value is 0.9392. (b) Reaction force of the load cell for the block test when the SMA torsion spring is cooled down naturally after the test(a). The RMSE is 0.0125N, and R2-value is 0.9850.
