S13  Integridade Estrutural
 
 Titulo:
EFFECTS OF STRENGTH MISMATCH ON FRACTURE BEHAVIOR OF WELDED STRUCTURES
 
Resumo :
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.  
 
Autores :
Robles, Luis Beltran
Ruggieri, Claudio 0
 
 
Trabalho Completo :

 

COBEM99 | Comissão  Organizadora | Palestras | Sessões Técnicas | Autor | Simpósios e Sessões Especiais | Revisores
Título  dos  Trabalhos | Local