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The stress-strain state of titanium foils used for accelerator output windows was investigated with various foil thicknesses and titanium grades. Initial material data included deformation diagrams, densities, Young’s moduli, and Poisson’s ratios for each grade. Experimental studies were performed to validate the central displacements of Titanium Grade 2 foils. Measurements were conducted using a Hexagon precision measurement machine to determine the effective friction coefficients between titanium and two contacting materials: stainless steel 304L and oxygen-free copper. The latter was obtained via fitting the displacement curves of the initial simulations and experimental measurements conducted. These coefficients were subsequently incorporated into refined numerical simulations to obtain a more accurate representation of the stress–strain state within the sealing region of the output window assembly. Comparative analyses of the simulation results were carried out for all selected titanium grades. The advantages and limitations of each grade were evaluated in terms of mechanical performance, deformation behavior, and suitability for use in accelerator output window applications.
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