Analytical Study on Structural Integrity of Target Vessel

摘要

Pressure wave is one of critical issues for structural integrity of the mercury target vessel for a MW-class neutron scattering facility. Impact tests on mercury were carried out under high strain rates to estimate the viscosity of mercury and to verify FEM code. An elastic-solid model without dependency on the strain rate could be used to predict impact behaviors in mercury. And, to estimate structural integrity of the target vessel made of stainless steel (the assumed allowable stress of 370.8 MPa), FEM analyses on the pressure wave were carried out under 1 MW (3 GeV, 25 Hz) proton beam condition. it was found that the maximum mises stress of 220.8 MPa was caused by the pressure wave on the outer surface at the center of the window.