14 June 2000 Energy absorption in axial and shear loading of particulate magnetostrictive composites
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Abstract
Energy absorption properties of polymer matrix Terfenol-D particulate composites have been experimentally measured. In this work two volume fractions of Terfenol-D were investigated and both exhibited peak energy absorption of up to 25 percent per cycle. The tests include mechanical loading in both axial and shear combined with applied axial magnetic fields. The results show that the energy absorbed in a cycle of loading is a strong function of stress amplitude. The peak energy absorption for the zero magnetic field case in both axial and shear loading occurs near zero amplitude and decreases with increasing stress amplitude. The maximum energy absorption near zero stress amplitude has been observed previously in monolithic Terfenol-D and is a result of the low magnetic anisotorpy of Terfenol-D. Combined magnetic-mechanical loading demonstrated the influence of magnetic field on energy absorption properties. The energy absorption is decreased as the static magnetic field is increased if the cyclic stress amplitude is held constant. If however, we hold a constant magnetic field and vary the cyclic stress amplitude is held constant. If however, we hold a constant magnetic field and vary the cyclic mechanical loading amplitude, it has been observed that the peak energy absorption curve is shifted to higher stress values. This suggests stress tunable dampers are possible.
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Geoffrey P. McKnight and Gregory Paul Carman "Energy absorption in axial and shear loading of particulate magnetostrictive composites", Proc. SPIE 3992, Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics, (14 June 2000); doi: 10.1117/12.388240; https://doi.org/10.1117/12.388240
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