Fatigue Endurance

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The data are principally for use when the design philosophy is one of "safe-life design", that is, the structure or component is required to be crack-free for the specified design life.

The major part of the data consists of constant amplitude stress-endurance curves (S-N curves) for aircraft materials (aluminium and titanium alloys and steels) and structural joints (riveted, bolted or bonded).

Data are applicable and relevant to:

-   Oscillatory motion, engine mechanisms and components

-   Vehicle chassis and steering loads

-   Manoeuvre loads, gust loads, and taxing loads on aircraft

-   Wind and wave loads

-   Stresses in a rotating shaft

Very few components in engineering are not subject to cyclic loading.  Even structures, which at first glance, appear to be governed by static considerations, such as bridges, suffer from fatigue (bridges experience wind and traffic variations).  The above list gives some idea of the wide range of structures and equipment that must be designed against fatigue

ESDU Fatigue Endurance consists of 12 sections and over 60 Data Items with associated software. The principal topics covered are:

  • ­Aircraft gust frequencies and ground loadings
  • ­life estimation of structures, statistical methods, endurance estimates (constant or   variable amplitude loading)
  • ­stress concentrations
  • ­screw threads, endurance of aluminum alloys
  • ­titanium alloys and steels
  • structural joints