Die Schadenslinie im Wöhlerdiagramm

Abstract

French-lines, synonymously. Due to the statistical nature of fatigue events, however, Wohlerdiagrams more and more are statistically ascertained and described by curves which commonly are referred as to probability-stress-cycle curves (PS-N). Accordingly, it was to find out, whether the feature ,,damage" might be described in a similar way, aiming at P,-S-N curves (Pd = Probability of damage) within the expected damage field. Using the steels Ck 35 and 34 CrMo 4 quenched and tempered, the statistically planned and evaluated investigations showed that within the Wohlerdiagrams of these steels large damage fields can be defined which extend from far before the ranges of finite life till far into these ranges (of scatter). Pd-S-N curves are given. Satisfactory shortcutmethods for estimating such curves using features as specimens' temperature and deformation during cyclic pre-loading could not be developed.By progressively increasing and -another sample -decreasing load tests to the same account of 0,34 Pulmgren-Miner-damage specimens showed remarkable differences when compared within French's concept of damage, I Einleitung

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“…This method was later extended with good results to the evaluation of the L range [13][14][15][16]. Since then the employment followed in a multitude of cases with metallic and polymeric specimens [19][20][21][22][23][24].…”