To provide a method of evaluating the degree of deterioration which enables the evaluation of deterioration in material such as thermal embrittlement and damage such as intergranular corrosion especially on a jobsite by a non- destructive method.
Ultrasonic wave is admitted into a test object S from a probe 21 to generate a surface wave P5 in the surface of the test object S. The probe 21 has a circular arc vibrator 21a and receives a reflected wave P2 directly reflected from the surface of the test object S and a leakage wave P4 attributed to the surface wave P5 by a vibrator 21a and the reflected wave P2 and the leakage wave P4 are compared to determine a sound velocity of the surface wave P5. The degree of deterioration in or damage to the test object S is evaluated by the sound velocity of the surface wave P5 of the test body. The depth of damage to the surface of the test object can be estimated by substantially multiplying the sound velocity of the surface wave and a representative value thereof.
YOKONO YASUKAZU
MATSUBARA SHIGEYUKI
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