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S13 Integridade Estrutural |
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Titulo:
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EFFECTS OF STRENGTH MISMATCH ON FRACTURE BEHAVIOR OF WELDED STRUCTURES
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Resumo :
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THIS STUDY EXTENDS THE WEIBULL STRESS APPROACH TO ADDRESS EFFECTS
OF WELD STRENGTH MISMATCH ON MACROSCOPIC FRACTURE TOUGHNESS OF
WELDMENTS. OUR APPROACH BUILDS ON THE BEREMIN MODEL TO ESTABLISH
A RELATIONSHIP BETWEEN THE MICROREGIME OF FRACTURE AND
MACROSCOPIC CRACK DRIVING FORCES FOR BIMATERIAL MEDIA BY ADOPTING
THE WEIBULL STRESS AS A PROBABILISTIC FRACTURE PARAMETER.
PLANE-STRAIN, SMALL SCALE YIELDING (SSY) REFERENCE FIELDS FOR
STATIONARY INTERFACE CRACKS ARE PRESENTED TO PROVIDE A MEASURE OF
MISMATCH EFFECTS. THE ANALYSES SHOW THE STRONG EFFECT OF THE
MISMATCH LEVEL ON THE MAGNITUDE OF NEAR-TIP STRESS FIELDS WHICH
QUANTIFIES THE LEVEL OF CONSTRAINT (ASSOCIATED WITH STRENGTH
MISMATCH) OVER DISTANCES OF A FEW CTODS AHEAD OF CRACK TIP.
COMPUTATION OF THE WEIBULL STRESS FOR THESE SMALL SCALE YIELDING
ANALYSES UNDER VARYING LEVELS OF STRENGTH MISMATCH PROVIDE
VALUABLE INSIGHT ABOUT THE EFFECTS OF WELD STRENGTH MISMATCH ON
FRACTURE RESISTANCE. OUR SSY RESULTS EXHIBIT THE ESSENTIAL
FEATURES OF THE MICROMECHANICS APPROACH IN CORRELATING
MACROSCOPIC FRACTURE TOUGHNESS WITH STRENGTH MISMATCH VARIATIONS.
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Autores :
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Robles, Luis Beltran
Ruggieri, Claudio 0
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Trabalho Completo :
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