Conductivity thermal time constant and thermoelectric

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conductivity; thermal time constant and thermoelectric potential; diffusivity; effusivity; specific heat Mechanical properties compressive, shear and tensile strength (and moduli); Poisson’s ratio; sonic velocity; hardness; temper and embrittlement Surface properties color, reflectivity, refraction index, emissivity Chemical Composition and Analysis Elemental analysis detection, identification, distribution and/or profile Impurity concentrations contamination, depletion, doping and diffusants Metallurgical content variation; alloy identification, verification and sorting Physiochemical state moisture content; degree of cure; ion concentrations and corrosion; reaction products Stress and Dynamic Response Stress, strain, fatigue heat treatment, annealing and cold work effects; stress and strain; fatigue damage and residual life Mechanical damage wear, spalling, erosion, friction effects Chemical damage corrosion, stress corrosion, phase transformation Other damage radiation damage and high frequency voltage breakdown Dynamic performance crack initiation, crack propagation, plastic deformation, creep, excessive motion, vibration, damping, timing of events, any anomalous behavior Signature Analysis Electromagnetic field potential; intensity; field distribution and pattern Thermal field isotherms, heat contours, temperatures, heat flow, temperature distribution, heat leaks, hot spots, contrast Acoustic signature noise, vibration characteristics, frequency amplitude, harmonic spectrum, harmonic analysis, sonic emissions, ultrasonic emissions Radioactive signature distribution and diffusion of isotopes and tracers Signal or image analysis image enhancement and quantization; pattern recognition; densitometry; signal classification, separation and correlation; discontinuity identification, definition (size and shape) and distribution analysis; discontinuity mapping and display M OVIE . Discontinuities in steel.
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be detected, then ultrasonic testing or radiography would be chosen. The exact technique in each case would depend on the thickness and nature of the material and the types of discontinuities that must be detected. Value of Nondestructive Testing The contribution of nondestructive testing to profits has been acknowledged in the medical field and computer and aerospace industries. However, in industries such as heavy metals, nondestructive testing may be accepted reluctantly because its contribution to profits may not be obvious to management. Nondestructive testing is sometimes thought of only as a cost item and can be curtailed by industry downsizing. When a company cuts costs, two vulnerable areas are quality and safety. When bidding contract work, companies add profit margin to all cost items, including nondestructive testing, so a profit should be made on the nondestructive testing. The attitude toward nondestructive testing is positive when management understands its value.
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  • Fall '19
  • Nondestructive testing, Acoustic Emission

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