The adaptive honeycomb structure actuated by pneumatic muscle fibers is proposed in this paper. The FE model of
adaptive honeycomb structure is developed by use of ANSYS software. The elastics modulus of the developed pneumatic muscle fibers is experimentally determined and their output force is tested. The results show that the contraction ratio of the pneumatic muscle fibers with inner diameter of 2mm could reach up to 26.8% and the force could reach to a value of 27N when the applied pressure is 0.4MPa and the contraction ratio is zero. When the adaptive honeycomb has a certain load and an effective output displacement, the applied force must be greater than a certain value. The adaptive honeycomb must be consumed extra energy when the output displacement and force are produced.
In this presented paper, spandex fibers with high elasticity and high recovery ratio were added into shape memory epoxy
resin, and the mechanical properties were improved obviously compared with pure shape memory resin. Compared with
pure material, elastic modulus of the sample with 20vol% spandex was increased by 28.2%, tensile stress by 49.7%, and
fracture strain by 16.4%. Then graphitized multi-walled carbon nanotubes (GMWNTs) were mixed into the spandex
reinforced SMPCs to make it conductive. It was found that surface-modified (by acid treatment) GMWNTs incorporated
very well with resin, and dispersion was achieved by high-energy sonication. In order to study the electrical conductivity,
the Four-point Probe Method was conducted on the surface-modified GMWTs reinforced composites. ( an order of 6.86
x104 Ω •cm was obtained in samples with 4.5wt% modified-GMWNTs). In comparison with the pure spandex
reinforced SMPCs, the elastic modulus of the surface-modified GMWTs (4.5wt%) reinforced composites was increased
by 300%, the tensile stress by 26%. However, the elongation at break of the SMPCs was decreased when GWMNTs
were mixed in it.
As a novel bionic actuator, pneumatic artificial muscle has high power to weight ratio. In this paper, the experimental
setup to measure the static output force of pneumatic artificial muscle was designed and the relationship between the
static output force and the air pressure was investigated. Experimental result shows the static output force of pneumatic
artificial muscle decreases nonlinearly with increasing contraction ratio. A variable camber wing based on the pneumatic
artificial muscle was developed and the variable camber wing model was manufactured to validate the variable camber
concept. Wind tunnel tests were conducted in the low speed wind tunnel. Experimental result shows that the wing
camber increases with increasing air pressure.
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