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S13 Integridade Estrutural |
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Title:
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DETERMINATION OF THE CLEAVAGE STRESS OF FERRITIC STEELS IN THE DBT REGION USING SEM AND FRAMTIC MODEL
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Summary :
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ABSTRACT. THE PURPOSE OF THIS WORK IS TO PRESENT A NEW APPROACH BASED ON FRACTOGRAPHICAL OBSERVATIONS, ACCOMPLISHED WITH SCAN ELECTRONIC MICROSCOPY, DEVELOPED FOR OBTAINING THE NECESSARY LEVEL OF STRESS NECESSARY TO CAUSE CLEAVAGE FRACTURE IN FERRITIC STEELS IN THE DUCTILE-TO-BRITTLE TRANSITION (DBT) REGION. THIS APPROACH USES A MODEL, NAMED FRAMTIC, BASED ON ANALYTICAL AND EXPERIMENTAL PROCEDURES AND APPLICABLE TO FERRITIC STEELS, THAT WAS INITIALLY CONCEIVED FOR MAKING POSSIBLE A BETTER UNDERSTANDING OF THE FRACTURE TOUGHNESS BEHAVIOR IN THE DUCTILE-TO-BRITTLE TRANSITION. THE MODEL USES A NUMERICAL CHARACTERIZATION OF THE CRACK TIP STRESS FIELD MODIFIED BY THE J-Q CONSTRAINT THEORY AND A WEAK LINK ASSUMPTION TO PREDICT BEHAVIOR IN THE TRANSITION. THE MODEL IS ABLE TO PREDICT THE FRACTURE TOUGHNESS SCATTERBAND FOR ANY DEFINED GEOMETRY FROM THE KNOWLEDGE OF A TOUGHNESS SCATTERBAND MEASURED ON TEST SPECIMEN GEOMETRY AND CAN DETERMINE THE END OF THE TRANSITION REGION. A NEW APPLICATION OF THE MODEL IS APPLIED, TOGETHER WITH FRACTOGRAPHICAL OBSERVATIONS OF FRACTURE SURFACES, IS HERE PRESENTED: THE COMPUTATION AND/OR ASSESSMENT OF THE LEVEL OF STRESS RELATED TO THE CLEAVAGE FRACTURE INITIATION, NAMELY CLEAVAGE STRESS.
KEYWORDS: FRACTURE MECHANICS, DUCTILE-TO-BRITTLE TRANSITION, CLEAVAGE, FERRITICSTEELS, FRACTOGRAPHIES
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Author :
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Andrade, Arnaldo H.P.
DeAquino, Carlos Tasso Eira
Ferreira, Itamar 0
Landes, John D.
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Paper View :
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