Damage

Damage is any change in a thing, often a physical object, that degrades it away from its initial state. It can broadly be defined as "changes introduced into a system that adversely affect its current or future performance".^[1] Damage "does not necessarily imply total loss of system functionality, but rather that the system is no longer operating in its optimal manner".^[1] Damage to physical objects is "the progressive physical process by which they break",^[2]^: 1. and includes mechanical stress that weakens a structure, even if this is not visible.^[2]^: ix.

^ ^a ^b Farrar, C.R., Sohn, H., Park, G., "Converting Large Sensor Array Data into Structural Health Information", in Andrew Smyth, Raimondo Betti, The 4th International Workshop on Structural Control (2005), p. 67.
^ ^a ^b Jean Lemaitre, A Course on Damage Mechanics (2013).

[Farrar-1] Farrar, C.R., Sohn, H., Park, G., "Converting Large Sensor Array Data into Structural Health Information", in Andrew Smyth, Raimondo Betti, The 4th International Workshop on Structural Control (2005), p. 67.

[Lemaitre-2] Jean Lemaitre, A Course on Damage Mechanics (2013).

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