In this paper numerical and experimental studies of deformation and fracture of thin
beryllium disks with a thickness of 5-100 .m are performed. Disks, intended for use as X-ray
windows, were obtained by the method of severe cold deformation. It is shown that beryllium
foils under loading by external pressure (or bulge test) have higher values of ultimate strains than
in tensile tests. It is established that the fracture at bulge test occurs at values of the accumulated
plastic strain amounting to 15-20%, what very high for beryllium.
Keywords: : thin beryllium foils; mechanical properties of beryllium foil; plasticity of beryllium; bulge test; beryllium fracture.
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