Fatigue and Stress | Design Philosophy Flashcards

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1
Q

This will determine the __- of an airframe

A

life

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2
Q

The fatigue life of a fuselage is based on ___ ___

A

pressurisation cycles

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3
Q

Repetitive pressurisation cycles can induce ___ ___, which can cause fatigue cracks

A

hoop stresses

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4
Q

Greater mass means ___ structural loads

A

greater

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5
Q

A change in one unit of the load factor means a _% change in the weight of the aircraft

A

1

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6
Q

The relationship between the Design Limit Load and the Design Ultimate Load is the __ ___ ___

A

factor of safety

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7
Q

The Design Limit Load refers to the ___

A

maximum load value of the repeated stress during normal operations

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8
Q

The Design Ultimate Load is the Design Limit Load increased by a safety factor of __%

A

50%

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9
Q

___ failures are caused by weak components that are either badly made or not inspected properly

A

Infant

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10
Q

Hard Time Maintenance is used when ___

A

the known deterioration of an item is limited to an acceptable level by maintenance at certain time periods

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11
Q

On-condition Maintenance is a preventative process in ___

A

which an item is monitored continuously or at specified periods, without disassmebly

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12
Q

Having a Mean Time to Failure of 3000 hours means that there is a ___ certainty of it surviving its normal life without failure

A

99.9

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13
Q

Fail safe means that no one part of a system takes the complete load, meaning that there are ___ and ___ paths

A

parallel structural

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14
Q

Spars my have ___, acting as fail-safes.

A

doubles

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15
Q

___ tolerance accepts that production flaws might exist and they are detected and fixed before they become critical

A

Damage

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16
Q

Damage tolerance is not a form of fail safe, it just spreads the loads over a ___ area

A

wider

17
Q

Damage tolerant structures are ___ than fail safe ones

A

lighter