Effect of a Tensile Mean Stress on the Alternating Stress Required to Propagate an Edge-Crack in Various Materials

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Abstract
The conditions governing growth or dormancy of edge-cracks in plate specimens of twelve materials subjected to the general tensile loading cycle σ m ± σ a, where σ m ≥ σ a and σ m + σ a < yield stress, have been determined. It was found that, as in the case of zero mean load, these conditions were defined by the value of the parameter σa3l; if σa3l < Cm a crack would grow whereas if σa3l < Cm it would remain dormant, where C m depended on the material and on the value of the ratio σ m/σ a. Above a certain value of σ m/σ a reached a minimum value for a given material. In general, this minimum value agreed with the value derived from the known fatigue crack growth characteristics of the material by assuming that during one loading cycle a crack will remain dormant if it cannot extend at least one atomic spacing.

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