Aircraft Structural Integrity and Fatigue Life Management Flashcards

1
Q

What is the probability of a structural failure during an aircrafts planned life?

A

1/1000

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2
Q

What is stress?

A

When a load is applied to a solid, a stress is produced, measured as the load divided by the cross-sectional area.

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3
Q

What are the 4 types of stress?

A

Compression (Pushing)
Tension (Pulling)
Torsion (Twisting)
Shearing (2 Metals moving over each other)

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4
Q

What is ultimate stress?

A

The stress at which a structure or material will fracture, and fail is known as ‘Ultimate Stress’

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5
Q

What are the stages of Fractures occurring?

A

Crack Initiation, Crack Growth and Final Fracture.

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6
Q

What is Critical Crack Length?

A

Critical Crack Length (CCL) is the length at which a crack propagates catastrophically to failure.

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7
Q

What is the S-N curve?

A

The relationship between applied alternating stress levels and the endurance to failure of a material can be illustrated in an ‘S-N Curve’. This plots the applied percentage of ultimate stress against the number of cycles to failure.

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