Simplified micromechanics model to assess constraint effect on brittle fracture at weld defects

2008 ◽  
pp. 145-152
Keyword(s):  
Brittle Fracture ◽  
Constraint Effect ◽  
Micromechanics Model ◽  
Weld Defects

Constraint Effects in Weld Thermal Simulated Steel Specimens

2008 ◽  
Author(s):  
Erling O̸stby ◽  
Christian Thaulow ◽  
Ba˚rd Nyhus
Keyword(s):  
Fracture Toughness ◽  
Brittle Fracture ◽  
Weibull Distribution ◽  
Constraint Effect ◽  
Weibull Parameters ◽  
Constraint Effects ◽  
Two Parameter ◽  
Fracture Constraint

The brittle fracture constraint effect in two different weld thermal simulated microstructures of a 500 MPa steel is investigated through testing of bending specimens with different a/W ratios. It is found that on average the constraint effect is higher in the CGHAZ microstructure compared to the ICCGHAZ. The procedure for calibration of Weibull parameters proposed by Gao et al. [1] has been applied to the results. It is found that a lower m-value is calibrated for the ICCGHAZ microstructure due to the lower constraint effect observed. Three-parameter representations of the Weibull distribution better represent the distribution of the fracture toughness values compared to two-parameter representations.

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