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The stress-strain state for thin beryllium windows of circular shape under cyclic loading
by external pressure was calculated using finite element method. The technique for estimating the
beryllium window's fracture probability was proposed. Technique is to compare the accumulated
plastic strain in a foil with a certain value of the critical plastic strain, determined experimentally
by foil samples bending tests. An experimental study of the durability for beryllium windows
with a thickness of 8 μm under cyclic loading with external pressure was performed. Good
convergence between the predicted and the fact number of load cycles without fracture was
established.
Keywords: thin beryllium foils; beryllium fracture; beryllium cyclic deformation; beryllium X-ray windows. |
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