Page 357 - Challenges in Corrosion Costs Causes Consequences and Control(2015)

CORROSION DAMAGE, DEFECTS, AND FAILURES 335

Aluminum compressed-air cylinder

Head Bottom

Figure 5.7 Out-of-service compressed air cylinder. (Copyright of her Majesty the Queen in
Right of Canada, as represented by the Minister of Natural Resources, 2004, 2006.)

Opening view

Head Bottom

Figure 5.8 Overall view of internal surface. (Copyright of her Majesty the Queen in Right
of Canada, as represented by the Minister of Natural Resources, 2004, 2006.)

ratio increases ∼1.5–2.0 as the crack location moves toward the crack tip. The ratios
−
1.5 and 2.0 likely represent Al O and AlO , respectively, thus leading to the con-
2
3
2
clusion that corrosion-induced cracking occurred.
5.3.7.4.4 Some Common Failure Modes in Aircraft Structures Failure of an air-
craft component can have catastrophic consequences such as loss of precious life and
aircraft. Failure modes in aircraft are given in Table 5.7.
It is clear from the data in the table that fatigue mode of failure is more common
than other modes of failure in aircraft. When the component is no longer able to with-
stand the imposed stress, failure is likely to occur. Thus failures are associated with
stress concentrations, which can occur because of: (i) design defects and the presence