Easy Bending Research Articles

A comparison of strain effect on critical current in Bi-2223 superconducting tapes in different bending modes

The influence of the bending strain on the critical current (I/sub c/) in Ag alloy/Bi-2223 superconducting tapes was investigated at 77 K. The strain effect on I/sub c/ degradation in the different bending modes is discussed in terms of sample geometry and n-value. The I/sub c/ degradation behavior with bending occurring across the tape's width direction called 'hard bending' is discussed in particular, and compared with results under conventional bending tests known as 'easy bending'. It was found that I/sub c/ degraded with increases in the bending strain. In the case of hard bending, greater degradation in I/sub c/ occurred than under easy bending. This might be a result of the difference in the filaments cross-section of the tape and the generation of a new type of damage, such as local buckling, expected during hard bending. The n-value also decreased as the bending strain increased and its behavior was similar to the I/sub c/-bending strain relationship.

Hand covering with vibration-reducing bladder

An air isolation hand covering has a bladder consisting of a plurality of interconnected or independent inflation cells that is positioned between the hand and a hand-held tool or other vibrating object. The cells are oriented to permit easy bending of the hand covering in directions appropriate for grasping an object. The effectiveness of the bladder in reducing the vibration energy transmitted to the hand is a function of the shape and configuration of the bladder, the pressure in the bladder, the compressible fluid used, the volume of the bladder, and the grip force and push force used when clasping a tool or other object. The bladder can be filled with air or other fluid during the fabrication of the bladder or it can be inflated or deflated with a small pump and integral air valve connected to one of the air cavities.