Course Details Language of Instruction Turkish Level of Course Unit Associate Degree Department / Program Non Destructive Testing Mode of Delivery Face to Face Type of Course Unit Compulsory Objectives of the Course 1- provision of ultrasonic examination skills 2- Being informed about the standards and reporting Course Content High frequency sound waves which are sent into the material will reflect if they run into an obstacle along the path of the sound. Signal that has been reflected may or may not reach the receiver probe based on the angle of reflection. Signal that has been received by the receiver probe will create the sign of an echo on the screen of an ultrasonic testing device. Coordinates of the reflector within the testing piece can be calculated based on the location of the echo. Additionally, the magnitude of the echo will give an idea about the size of the reflector. It may also be possible to speculate about the type of reflector by looking at the shape of the reflected signal. In metallic and non metallic materials, anticipated volumetric mistakes and the type of crack can be used to determine surface deficiencies. It will become more difficult to make the correct interpretation in the case when the speed and the intensity of the sound characteristics change drastically from one part of the material to the other. It may sometimes be impossible to test materials in which the intensity of the sound decreases too much due to the coarse grain structure and absorption. Specially designed probes should be used for hot surfaces that are to be tested. Sufficiently wide surface that can be reached should be prepared for testing. The state of the surface effects the paramaters of the test directly. It is relatively more difficult to test thin pieces. It is impossible to determine superficial discontinuities that are parallel to the axis of a cluster of sound. There is usually a need for reference standard blocks. High frequency sound waves are produced by a crystal which is inside a piece called probe and which has piezoelectric property. The frequency interval that is used in the ultrasonic tests of metallic materials can be between 500 kHz and 10 MHz. Proper frequency is determined according to the micro structure properties of the piece to be tested. The proper contact liquid (oil, grease, water, etc.) should be used so that the sound waves can penetrate into the material when the probe makes contact with the surface of the piece to be tested. The existence or non existence of echoes that are not caused by the geometry of the piece can be determined by moving the probe on the testing surface. If there are such echoes, error analysis will be made by evaluating the position and the magnitude of these echoes. The types of waves that are used most commonly in ultrasonic tests are longitudinal (pressure) and transverse (shear) waves. Longitudinal waves are those waves that travel through the inside of the material while working with probes that are called normal probes and which have an entrance angle of zero degrees. Angled probes transmit transverse waves into the material usually with the entrance angles of 45°, 60° and 70° (these values ar efor steel materials. Course Methods and Techniques Prerequisites and co-requisities None Course Coordinator None Name of Lecturers Instructor Kadir Koçak Assistants None Work Placement(s) No Recommended or Required Reading Resources GEV Ultrasonik muayene eğitim notu Tahribatsız Muayeneler, Ahmet Topuz, Y.T.Ü. yayını, 1993 expression, question answer, application yazılı sınav, uygulama Course Category Mathematics and Basic Sciences %15 Engineering %15 Field %70

 





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