Longitudinal pulse velocity in kms or ms is given by

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Longitudinal pulse velocity (in km/s or m/s) is given by: v = L/T where , v = Longitudinal pulse velocity L = Path Length T = Time taken by the pulse to traverse that length.
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23 (a) Results for concrete with the top 50 mm of inferior quality (b) Results for homogeneous concrete. Pulse velocity determination by indirect (surface) transmission.
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24 Part is magnetized. Presence of a surface or subsurface discontinuity in the material allows the magnetic flux to leak, since air cannot support as much magnetic field per unit volume as metals. Ferrous iron particles are then applied to the part. Particles will build up at the area of leakage and form what is known as an indication. Magnetic particle inspection
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25 Magnetic particle inspection
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26 Penetrant may be applied to the test component by dipping, spraying, or brushing After adequate penetration time, the excess penetrant is removed, a developer is applied. Developer helps to draw penetrant out of the flaw where an invisible indication becomes visible to the inspector
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27 1. Section of material with a surface-breaking crack that is not visible to the naked eye. 2. Penetrant is applied to the surface. 3. Excess penetrant is removed. 4. Developer is applied, rendering the crack visible.
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28
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29 Short wavelength electromagnetic radiation (high energy photons) to penetrate various materials. The amount of radiation emerging from the opposite side of the material can be detected and measured
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30 X-Ray Equipment Gamma Rays Equipment
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31 X-Ray Image of reinforced concrete column X-Ray Equipment
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32 Tube exhibiting no cracking Tube exhibiting light cracking Tube exhibiting moderate cracking Tube exhibiting severe cracking
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33
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34 Uses electromagnetic induction to detect flaws in conductive materials.
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35 Variations in the phase and magnitude of these eddy currents can be monitored using a second 'receiver' coil, or by measuring changes to the current flowing in the primary 'excitation' coil. Variations in the electrical conductivity or magnetic permeability of the test object, or the presence of any flaws, will cause a change in eddy current and a corresponding change in the phase and amplitude of the measured current.
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36
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37 SCHMIDT REBOUND HAMMER TEST Principle : It works on the principle that the rebound of an elastic mass depends on the hardness of the surface against which the mass impinges.
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  • Summer '17
  • Engr. Arnolfo Arcibal
  • Nondestructive testing, Destructive Testing, Penetrant, Destructive Physical Analysis

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