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Simulated strain fields (COMSOL) in a three-layered construct as used in ultrasound elastography testing for a sequence of four 40 μm ramp compressions (0.44% global strain per step): (a) History of the averaged strain across each layer for the prescribed ramp compressions. (b) Strain map at the end of the fourth step (160 μm, 1.78% global strain, 240 s test time).
