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Article
Affiliation(s)

1. Department of Solid Mechanics, Institute of Mechanics-Bulgarian Academy of Sciences, Sofia 1113, Bulgaria
2. Institute of Metal Science, Eqipment, and Technologies-BAS, Sofia 1574, Bulgaria

ABSTRACT

The constants in fracture mechanics are fracture toughness (for plane strain), critical value of J—integral , critical value of crack tip opening displacement. Mechanical testing under certain conditions to determine them is used. They are complicated, long and expensive procedures. In practice, it is interesting to determine the constant in fracture mechanics for elements of constructions by means of non-destructive testing (NDT) (non-destructive evaluations, NDE) from Al+3.5%Mg alloys (according EN 1706).

KEYWORDS

Constant in fracture mechanics, Al+3.5%Mg alloys, ultrasonic, hardness.

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