DETERMINATION OF DAMAGE VARIABLE BY MEASUREMENT OF DIFFERENTIAL PERMEABILITY

Štefan Barta – Peter Dieška –Ivan Tomáš –Jan Bydžovský

   The aim of this paper is to introduce a modified damage variable for control and security purposes and to determine relation between the modified damage variable and a certain component of the plastic part of the linear strain tensor. Two relations for determination of the above-mentioned relation were derived. The first one is a relation between the effective differential permeability and the modified damage variable. The second one is the time evolution law for the modified damage variable.

Keywords: modified damage variable, magnetic adaptive testing, nondestructive evaluation, differential permeability

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