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This paper investigates the magneto-mechanical behavior of polymer composite materials containing magnetostrictive Terfenol-D particles.Different particle sizes in a range of 0-300 m were selected,and different magnetostrictive composites that contain Terfenol-D particles in an epoxy matrix were prepared by changing the amount of Terfenol-D particles,from 30 to 70 wt%,and modifying the epoxy resin with carbon nanotubes (CNTs).First,the strain of the polymer matrix/Terfenol-D hybrid composites under various magnetic fields was measured at room temperature with strain gauges,and the effects of weight fraction of Terfenol-D particles and CNT addition on the deformation behavior were discussed.It was found that under the magnetic fields,tensile deformation occurs for the composites with CNTs whereas bending deformation occurrs for the composites without CNTs.Next,the magnetic induction changes of the composites due to the applied load was measured using a Tesra meter and discussed in detail.