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S13 Integridade Estrutural |
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Title:
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FRACTURE TOUGHNESS R-CURVES IN LAMELLAR GRAY CAST IRON
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Summary :
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FRACTURE MECHANICS PROPERTIES IN LAMELLAR GRAY CAST IRON HAVE TRADITIONALLY BEEN EVALUATED FROM PARAMETERS CALCULATED AT MAXIMUM LOAD VALUES FROM LOAD VS. CRACK MOUTH OPENING DISPLACEMENT RECORDS. THE EVALUATION HAS BEEN CARRIED OUT IN THIS WAY AS A CONSEQUENCE OF THE DIFFICULTY TO MEASURE THE STABLE CRACK GROWTH. THE CHEMICAL TINTING TECHNIQUE, PRESENTED IN THIS PAPER, PERMITS THE STABLE CRACK -GROWTH IN LAMELLAR GRAY CAST IRON TO BE MEASURED, AND THEN, THE DETERMINATION R-CURVES AND JIC VALUES BY MULTIPLE SPECIMEN TECHNIQUE. A GOOD AGREEMENT BETWEEN THE MEASURED COMPLIANCES AND THE THEORETICAL ONES WAS ALSO OBSERVED. MAXIMUM LOAD VALUES (KPMAX AND DM) WERE ALSO DETERMINED AND NONE OF THEM PRESENTED ANY TENDENCY FOR A/W RANGING FROM 0.45 TO 0.65. THE EFFECT OF THE NOTCH RADIUS IN THE MEASURED TOUGHNESS WAS ALSO ANALYZED AND ANY CLEAR TENDENCY WAS OBSERVED BY TESTING SPECIMENS WITH RADIUS FROM 0.2 TO 3.5MM. |
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Author :
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Bertolino, Graciela 0
Marengo, Alfredo Anibal
Perez-Ipiņa, Juan E.
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Paper View :
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