TiC reinforced magnesium matrix composites (Mg-MMCs) were successfully synthesized by spontaneously infiltrating the molten magnesium into Ti-C preforms, simultaneously in situ forming TiC particles in the liquid of magnesium alloy. The compressive deformation behaviors of TiC reinforced Mg-MMCs were further investigated by means of uniaxial compression tests at strain rates between 10 À3 s À1 and 1 s À1 and temperature between room temperature and 200 C. Early fracture was observed in the low-temperature/high strain rate regime, fracture occurring by crack propagation at 45 degree with respect to the compression axis. In high-temperature/low strain rate regime, the flow curves exhibited the typical flow softening shape. The results show that with the addition of TiC particles Mg-MMCs can effectively improve compressive properties of magnesium matrix at testing temperature interval. When compared to the unreinforced counterpart, TiC reinforced Mg-MMCs need higher temperature and lower strain rate to avoid premature fracture.
As the development of space structures is increasing fast, the kinematic characteristic, dynamic characteristics, driving modes and the influence of the component parameters of a planar deployable support truss structure for space antenna are discussed by means of the closed loop equations and the Kane equation. Also several examples of kinematic and dynamic analysis results under different driving modes are presented. The results show the importance of the choice of driving movements and the design of parameters and also provide a useful reference to other related truss structures.
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