A Model for Joining the Fatigue Crack Initiation and Propagation AnalysesAn analytical model for nonarbitrarily defining the crack initiation length of a notched member on the basis of the minimum total life estimate is proposed. This model provides an interpretation of fatigue notch size effect and a. |
Contents
INTRODUCTION | 1 |
PARTITIONING OF FATIGUE CRACK INITIATION | 25 |
SUMMARY AND CONCLUSIONS | 31 |
1 other sections not shown
Common terms and phrases
A-36 MILD STEEL AKth ALUMINUM ALLOY assumed crack initiation BASIS OF CRACK BASIS OF TOTAL calculated CIRCULARLY NOTCHED SPECIMEN Crack Growth Coefficient crack initiation length crack length CURVES WITH NT Cycles FIGURE damage rate due decreasing DEFINED ON BASIS DIFFERENT NOTCH GEOMETRIES due to crack elastic limit Elastic Modulus ELLIPTICALLY NOTCHED SPECIMEN EXPERIMENTAL LIVES fatigue crack initiation fatigue crack propagation fatigue notch factor fracture mechanics Fracture Toughness GEOMETRICALLY SIMILAR NOTCHED initiation and propagation K₁ LIFE-CALCULATION METHOD mean stress relaxation MECHANICAL PROPERTIES micro-element N₁ notch root notch size effect notched member NT ESTIMATED NUMERICALLY DETERMINED Peterson's Formula PREDICTED AND EXPERIMENTAL Predicted NT propagation life Np q IS DEFINED q-r CURVES RATE-CALCULATION METHOD scanning electron microscope shown in Fig SIMILAR NOTCHED SPECIMENS SPECIMENS OF HY-130 stress concentration stress intensity factor stress-strain parameter Threshold Stress Intensity total fatigue Transition Fatigue VARIATION OF q-r VARIOUS STRESS LEVELS Yield Strength