Method for blasting object to be treated in pressure vessel
AssigneeKobe Steel, Ltd.
InventorsKoichi Hayashi, Takao Shirakura, Kiyoshi Asahina
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Abstract
A blast treatment method for blasting an object includes: a step in which an explosive is detonated inside a pressure vessel (30) which has an elasto-plastic metal, thereby imparting to the pressure vessel (30) an initial load wherein the primary and secondary stress generated in at least a portion of the pressure vessel becomes high enough to be in a plastic region exceeding the elastic region, thereby generating a shakedown state in the pressure vessel (30); and a subsequent step in which a treatment explosive (50) is detonated within the pressure vessel (30), thereby blasting the object (10).
Claims6
A method for blasting an object to be treated, including:
- preparing a pressure vessel that comprises a metal having elasto-plasticity, has a shape allowing the object to be treated to be contained in a closed state, and has an inner circumferential surface to receive detonation energy generated when the object to be treated is blasted in a contained state;
- giving an initial load to the pressure vessel to the extent that the sum of a primary stress and a secondary stress generated in the pressure vessel exceeds an elastic limit and reaches a plastic region at least at a part of a structural part excluding a local structural discontinuous part of the pressure vessel and generating a shakedown state to the pressure vessel by containing an explosive, sealing the pressure vessel, and detonating the explosive to give the initial load;
- and
- blasting the object to be treated in the pressure vessel by containing the object to be treated and a treatment explosive in the pressure vessel after the initial load is given, sealing the pressure vessel, and detonating the treatment explosive.
Dependencies are inferred from the claim text.