報告書番号

E281005

タイトル（和文）

FINITE ELEMENT MODEL SIMULATION OF CREEP CRACK GROWTH IN LOW-DUCTILITY MATERIAL

タイトル（英文）

FINITE ELEMENT MODEL SIMULATION OF CREEP CRACK GROWTH IN LOW-DUCTILITY MATERIAL

概要 （図表や脚注は「報告書全文」に掲載しております）

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概要 （英文）

THE FINITE ELEMENT METHOD WAS APPLIED TO THESIMULATION OF CREEP CRACK GROWTH(CCG) IN A CENTER CRACKED PLATE, AND SINGLE AND DOUBLE EDGE CRACKED SPECIMENS FOR THE PURPOSE OF DISCUSSION ON A FRACTURE MECHANICS PARAMETER CONTROLLING THE RATE OF CCG UNDER SMALL SCALE YIELDING (WHERE A CREEP ZONE AHEAD OF A CRACK TIP IS MUCH SMALLER THAN THE SURROUNDING ELASTIC REGION)AND EXTENSIVE CREEP CONDITIONS. AS A RESULT,IT WAS RECOGNIZED THAT THE SMALL SCALE YIELDING CONDITION IN CREEP WAS SATISFIED IN CASE OF THE FRACTURE STRAIN OF THE ORDER OF 0.001. THE CORRELATION OF CCG RATE WITH THE ELASTIC STRESS INTENSITY FACTOR, K, WAS FOUND TO DEPEND ON THE SPECIMEN GEOMETRY, ALTHOUGH K COULD BE A GOOD PARAMETER INDIVIDUALLY FOR EACH SPECIMEN GEOMETRY UNDER THE SMALL SCALE YIELDING CONDITION. ON THE OTHER HAND IT WAS FOUND THAT THE SO-CALLED C*PARAMETER BASED ON THE CONCEPT OF NON-LINEAR FRACTURE MECHANICS WAS A CCG CONTROLLING PARAMETER FOR THE SMALL SCALE YIELDING CONDITION AS WELL AS UNDER THE EXTENSIVE CREEP CONDITION.

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