Conductor on Round Core (CORC®) technology has achieved a long sought-after benchmark by enabling the production of round, multifilament, (RE)Ba 2 Ca 3 O 7-x coated conductors with practical current densities for use in magnets and power applications. Recent progress, including the demonstration of engineering current density beyond 300 Amm-2 at 4.2 K and 20 T, indicates that CORC® cables are a viable conductor for next generation high field magnets. Tapes with 30 µm substrate thickness and tape widths down to 2 mm have improved the capabilities of CORC® technology by allowing the production of CORC® wires as thin as 3 mm in diameter with the potential to enhance the engineering current density further. An important benefit of the thin CORC® wires is their improved flexibility compared to thicker (7 to 8 mm diameter) CORC® cables. Critical current measurements were carried out on tapes extracted from CORC® wires made using 2 and 3 mm wide tape after bending the wires to various diameters from 10 cm to 3.5 cm. These thin wires are highly flexible and retain close to 90 % of their original critical current even after bending to a diameter of 3.5 cm. A small 5-turn solenoid was constructed and measured as a function of applied magnetic field, exhibiting an engineering current density of 233 Amm-2 at 4.2 K and 10 T. CORC® wires thus form an attractive solution for applications between 4.2 K and 77 K, including high-field magnets that require high current densities with small bending diameters, benefiting from a ready-to-use form (similar to NbTi and contrary to Nb 3 Sn wires) that does not require additional processing following coil construction.
Atomistic Monte Carlo (MC) simulations of uniaxial tension of an amorphous linear polyethylene (PE)-like polymer glass have been carried out. A united-atom model has been used where PE chains are represented by beads connected by flexible springs. Highly efficient end-bridging MC moves have been used to first equilibrate the polymer in the melt and then cool to a temperature below its glass transition temperature. A mix of efficient MC moves has also been used to simulate the deformation dynamics. Upon uniaxial deformation the stress response to the strain is initially linear elastic, subsequently as the strain increases further yielding is observed, and finally strain hardening is developed. The simulated Young modulus and Poisson ratio take realistic values. Furthermore, the temperature and strain rate dependencies of stress−strain curves have been investigated, and the results are in qualitative agreement with the experimental observations. Chain conformation and energy and stress partitioning with increasing strain are followed in detail. During the deformation the chains adopt more extended conformations, and the fraction of dyads in the trans state increases. In the elastic region mechanical work done on the sample is primarily stored as nonbonded internal energy, whereas from the yield region onward the intrachain contributions start to play a role.
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