Functionally graded concrete materials (FGCs) are new concrete composites whose functions and properties change with the spatial position. In this paper, the research status on the fabrication and mechanical behavior of FGCs was briefly reviewed, and the next work is also summarized.
In order to solve the problem of insufficient bearing capacity of existing concrete piles, a type of concrete pile with an additional lengthened strengthening core is designed, by inserting the steel tube through guiding hole and pouring core concrete. To reveal the mechanical performance of the reinforced piles, scale model tests and finite element simulations were performed. The results showed that both the vertical and horizontal bearing capacity increase with the length of the stiffening core. The axial force of the enhanced core is also smaller than conventional concrete piles, and the extended core can share the axial force of the foundation pile to improve the stress distribution of the pile body. These findings point toward a useful and general method for increasing the load capacity of existing concrete piles.
The magneto-electro-elastic (MEE) materials are able to effectively realize the mutual transformation among the electric energy, magnetic energy and mechanical energy. They are widely used in many important areas (e.g., in aerospace, biomedicine and intelligent manufacturing) due to their excellent properties. However, owing to low fracture toughness and high defect sensitivity, MEE materials are prone to crack. In this paper, we give a brief summary on fracture studies of MEE smart materials, mainly from analytical and numerical perspectives.
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