Failure:
In engineering, the loss of function of a component as specified in its original design is called failure. Failure includes the complete loss of the original function; function is reduced and have serious damage or hidden danger, continue to use will lose reliability and safety. Failure of mechanical parts is mainly (1) the overall fracture (2) excessive residual deformation (3) the surface of the part damage (d) damage to the normal operating conditions caused by the failure.
Failure:
Failure (fault): equipment in the course of work, for some reason, "loss of function" or jeopardize the safety of the phenomenon.
Specified function refers to the function specified in the technical documents of the equipment. Failure is sometimes referred to as a malfunction, or it may be that the equipment is lost in operation is also a malfunction, but these failures are repairable.