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Non Destructive Testing (NDT, NDE, NDI)
Methods and techniques that allow to measure and evaluate the properties of a specimen without altering or damaging it.

Note: Some methods and techniques are minimally invasive and are researched and performed by NDT personnel. Some European organizations have categorized these as Minor Damage Testing (MDT) (or "minimally destructive testing" or the improper English "minor-destructive testing") and rate the severity of the method or technique. From a practical and contractual viewpoint, these methods and techniques are also called Non Destructive Testing. An example is Half-Cell Potential Mapping of corroded beams embedded in concrete (ASTM C876); the method requires electrical contact with the beam, which typically requires a single drilled hole, but then the entire width and length of the beam can be evaluated non-destructively without removing additional concrete.
Ferromagnetic Material
a material that, in general, exhibits the phenomena of magnetic hysteresis and saturation, and whose permeability is dependent on the magnetizing force.
Nonferromagnetic material
a material that is not magnetizable and hence, essentially not affected by magnetic fields. This would include paramagnetic materials and diamagnetic materials.
Stiffness is the resistance of an elastic body to deformation by an applied force along a given degree of freedom (DOF) when a set of loading points and boundary conditions are prescribed on the elastic body. It is an extensive material property.


Minor Damage Testing

Non Destructive Testing
Non Destructive Evaluation
Non Destructive Inspection