9 research outputs found
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Investigation of the elastic modulus of SSC coils
The Materials Development Laboratory at Fermilab has been conducting experiments on the mechanical properties of superconducting coils. Two of these measurements were designed to measure the elastic modulus of actual SSC coils in an effort to increase the precision of previously reported data. The first experiment utilizes a fixture redesigned for increased stiffness, in an attempt to reduce uncertainty in the data. As in the previous fixture of this type, the inner coil radius has been left unconstrained. The second fixture constrains the coil on all sides, allowing for the determination of the radial and azimuthal components of the cured coil modulus. A finite element model of the first test arrangement was also created to predict the compliance of the fixture, and compare numerical predictions with the experimental data. The results from this fixture suggest that the coil modulus is higher than previously reported, at 1.43{plus_minus}0.03{times}10{sup 10} Pa (2.08{plus_minus}.05{times}10{sup 6} psi). The main difference between the two experiments were the compliance of the fixture, which was found to have been seriously underestimated in last years test. Results from the second fixture suggest a coil modulus of 8.48{plus_minus}0.82{times}10{sup 9} Pa (1.23{plus_minus}0.12{times}10{sup 6} psi) for the azimuthal modulus, and between 8.96{plus_minus}0.822{times}10{sup 9} Pa (1.3{plus_minus}0.12{times}10{sup 6} psi) at lower loads and 1.12{plus_minus}0.24{times}10{sup 10} Pa (1.63{plus_minus}0.35{times}10{sup 6} psi) at higher loads in the radial direction. For a constrained coil, little difference is noted between the radial and azimuthal moduli of the coil. 2 refs., 8 figs
Recommended from our members
Investigation of the elastic modulus of SSC coils
The Materials Development Laboratory at Fermilab has been conducting experiments on the mechanical properties of superconducting coils. Two of these measurements were designed to measure the elastic modulus of actual SSC coils in an effort to increase the precision of previously reported data. The first experiment utilizes a fixture redesigned for increased stiffness, in an attempt to reduce uncertainty in the data. As in the previous fixture of this type, the inner coil radius has been left unconstrained. The second fixture constrains the coil on all sides, allowing for the determination of the radial and azimuthal components of the cured coil modulus. A finite element model of the first test arrangement was also created to predict the compliance of the fixture, and compare numerical predictions with the experimental data. The results from this fixture suggest that the coil modulus is higher than previously reported, at 1.43{plus minus}0.03{times}10{sup 10} Pa (2.08{plus minus}.05{times}10{sup 6} psi). The main difference between the two experiments were the compliance of the fixture, which was found to have been seriously underestimated in last years test. Results from the second fixture suggest a coil modulus of 8.48{plus minus}0.82{times}10{sup 9} Pa (1.23{plus minus}0.12{times}10{sup 6} psi) for the azimuthal modulus, and between 8.96{plus minus}0.822{times}10{sup 9} Pa (1.3{plus minus}0.12{times}10{sup 6} psi) at lower loads and 1.12{plus minus}0.24{times}10{sup 10} Pa (1.63{plus minus}0.35{times}10{sup 6} psi) at higher loads in the radial direction. For a constrained coil, little difference is noted between the radial and azimuthal moduli of the coil. 2 refs., 8 figs