a b s t r a c t
This paper presents a new NDT technique based on bacterial cell suspensions to identify surface micro
defects in a procedure similar to the one used in dye penetrant. Validation was performed using
Rhodococcus erythropolis bacteria in aluminum, steel and copper samples, studying the penetration,
liquid removal and revelation stages and the phenomena involved in each one, as well as, bacteria/
material interaction. A detectability limit was estimated and this was seen to depend on the material.
Under the tested conditions defects with a depth of 4.3, 2.9 and 6.8µm were identified in Al, steel and Cu,respectively
a b s t r a c t
This paper presents a new NDT technique based on bacterial cell suspensions to identify surface micro
defects in a procedure similar to the one used in dye penetrant. Validation was performed using
Rhodococcus erythropolis bacteria in aluminum, steel and copper samples, studying the penetration,
liquid removal and revelation stages and the phenomena involved in each one, as well as, bacteria/
material interaction. A detectability limit was estimated and this was seen to depend on the material.
Under the tested conditions defects with a depth of 4.3, 2.9 and 6.8µm were identified in Al, steel and Cu,respectively
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