The common ways of failure of mechanical parts can be divided
into three types: failure of excessive deformation, failure of fracture, and
failure of surface damage. This is called failure:
1. Excessive
deformation failure: Failure of the part due to excessive deformation beyond
the allowable range. It mainly includes failure modes such as excessive elastic
deformation, plastic deformation, and creep at high temperatures.
2.Failure: a phenomenon of two or more parts that are
separated into each other because of the excessive load or fatigue damage of
the parts.Fracture is
the most severe form of failure, including the failure of
ductile fracture, brittle failure of low temperature, failure of fatigue
fracture, failure of creep rupture and failure of environmental rupture.
3.Failure of surface damage: failure due to surface relative
friction or corrosion of environmental media caused by damage or dimensional
change on the part surface.It mainly includes surface wear
failure, corrosion failure, surface fatigue failure and other forms.
It needs to be pointed out that the same mechanical parts are
often not only a failure mode in the work.However, it is
always a way to play a leading role in the failure of parts.The
core problem of failure analysis is to find out the main failure mode.