S0404-2-4 水銀液滴衝撃壊食における数値解析的考察(衝撃問題の新たなる展開と応用(2))

概要

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MW-class spallation neutron sources are being developed in the world. High intense proton beani hits the heavy liquid metal targets to produce spallation neutrons. Cavitation bubbles are formed by negative pressure which is induced through the pressure wave propagation due to proton beam injection. Pitting damage is formed by microjet impact during cavitation bubble collapse. The stainless steel with the multi-layered surface that consists of stainless steel and gold films was newly developed to mitigate the damage by microjet impact. In this study, thickness of the film layers were optimized through the numerical simulations. The damage and dynamic response were numerically compared between homogeneous and multi-layered surfaces. The stress wave propagations were evaluated along the interface between layers. The dynamic deformation of multi-layered surface is dependent on the thickness of layers and the stress propagation might be dispersed by the interface of multi-layered surface. It can be said that the multi-layered surface improvement is effective to reduce the localized stress due to impact.
2009-09-12