Abstract
The usefulness of simple sheet and plate specimens is discussed for various experimental research purposes. Specimens should be representative, as much as possible, of the conditions of fatigue problems in practice, which is more difficult to achieve for the fatigue crack initiation phase than for macro‐crack growth. In many cases, small specimens can not be recommended because of insufficient similarity to the conditions of the engineering structure. Larger specimens have advantages for measurements of crack length and crack closure. The compact tension specimen and a recently proposed derivative are asymmetric specimens, while the middle crack specimen, central notch specimen and double‐edge notch specimen are symmetric. The latter specimens should be preferred for experimental reasons as well as for reasons of a better similarity to the conditions of practical fatigue problems. A significant disadvantage of the asymmetric specimens is the high gradient of the stress intensity factor (dK/da).
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