We experimentally investigate shear thickening in dense granular suspensions under oscillatory shear. Directly imaging the suspension-air interface, we observe dilation beyond a critical strain γc and the end of shear thickening as the maximum confining stress is reached and the contact line moves. Analyzing the shear profile, we extract the viscosity contributions due to hydrodynamics ηh, dilation ηcand sedimentation ηg. While ηg governs the shear thinning regime, ηh and ηctogether determine the shear thickening behavior. As the suspending liquids viscosity varies from 10 to 1000 cSt, ηh is found to compete with ηcand soften the discontinuous nature of shear thickening. Copyright © EPLA, 2014.
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