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Excessive vibrations in civil and mechanical systems can cause structural damage or detrimental noise. Structural vibrations can be mitigated either by attenuating energy from vibration sources or isolating external disturbance from target structures. Magnetostrictive materials coupling mechanical and magnetic energies have provided innovative solutions to vibration control challenges. Depending on the system’s tunability and power consumption, the existing vibration control strategies are categorized into active, passive, and semi-active types. This article first summarizes the unique properties of magnetostrictive materials that lead to compact and reliable vibration control strategies. Several magnetostrictive vibration control mechanisms together with their performance are then studied using lumped parameter models. Finally, this article reviews the current state of vibration control applications utilizing magnetostrictive materials, especially Terfenol-D and Galfenol.

Z. DENG and M.J. Dapino, “Review of magnetostrictive materials for structural vibration control,” Smart Materials and Structures. Vol. 25, 11301, 2018.

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High-integrity ceramic-metal composites combine electrical, thermal, and corrosion resistance with excellent mechanical robustness. Ultrasonic additive manufacturing (UAM) is a low temperature process that enables dissimilar material welds without inducing brittle phases. In this study, multiple layers of Yttria-stabilized zirconia (YSZ) films are jointed between layers of Al 6061-H18 matrix using a 9 kW UAM system. UAM is advantageous over existing metal-ceramic composite fabrication techniques by continuously joining ceramics to metals at a speed of 2 m/min while requiring a moderate temperature that is 55% of the melting point of aluminum. The welding interface, which is found to include a 10 nm thick diffusion zone, is investigated using optical microscopy and energy-dispersive X-ray (EDX) spectroscopy. The shear strengths of the as-welded and heat-treated composites are 72 MPa and 103 MPa, respectively. The shear deformation and failure mechanism of the YSZ-Al composites are investigated via finite element modeling.

Z. DENG, M.B. GINGERICH, T. HAN, and M.J. Dapino, “Yttria-Stabilized Zirconia-Aluminum matrix composites via ultrasonic additive manufacturing,” Composites Part B. Vol. 151, 215-221, 2018.