Definitions Flashcards
Failsafe
In the event of a failure, the component as a whole remains safe
Safelife
The designed life span of a component in which it remains safe
Damage tolerace
Ability of a structure to sustain defects safely until repairs can be done
Faulty tolerant
Design of a component that enables it to remain functional at a reduced level
Measuring Safe life
Can be done as a measure of cycles, landings, calendar duration
Redundancy
Duplication of components to use in the event of a failure
Stress
THe internal force per unit area inside a structure component as a result of external loads
Strain
Deformation caused by stress on a material, given as a change of dimension, or percentage of original
Dynamic Load
Forces imposed by manoeuvres, They build and subside very quickly. E.g. takeoffs, landings, banking
Static Loads
Build and decline slowly over time, basically constant. E.g. in constant flight or on the ground
Cyclic loads
Loads that reoccur regularly, rapidly changing requencies, e.g. pressurisation.
Tension
Pulling apart force
Compression
Pushing together force
Torsion
Twisting force
Shear
Rotational force
Elastic Deformation
A material that will return to its original form
Plastic deformation
A material which will not return to its original form
Factor of safety
A built in tolerance above the normal use parameters
Limit load
THe limit of load used in normal manoeuvres or functinos
Ultimate load
1.5 times the limit load, this is the factor of safety. IT is OK to move into this load for short periods of time if necessary
Fatigue
Microscopic cracks forming in materials over time from normal cyclic loads.
