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Digital image correlation (DIC) is a powerful tool for quantifying local stresses and strains. The demand for environmentally benign Pb-free solders and the push toward smaller portable electronics will make it more likely for solder interconnects to en-counter mechanical shock through dropping or mishandling. Thus, quantifying the strain rate behavior of Pb-free solders from the quasi-static to the...
High-purity high residual resistivity ratio niobium is used to fabricate particle accelerator cavities for advanced superconducting accelerators. This material has an unstable texture that causes different r values in different inplane directions, which evolve with deformation, making prediction of forming characteristics difficult. Thus, an evolutionary yield function having coefficients that evolve...
Ultra-high-purity niobium sheet is used to fabricate radio frequency cavities for use in future linear accelerators. The complexity of the shapes requires the electron-beam welding of deep-drawn components, but difficulties with inconsistent formability, springback, and surface roughness have been traced to non-uniform microstructures and texture gradients that are common in commercial niobium sheet...
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