Transcription of The Local Stress-Strain Fatigue Method
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The Local Stress-Strain Fatigue Method
The Local Stress-Strain Fatigue Method ( -N) 2010 Grzegorz Glinka. All rights most engineering structures and machine components are designed such thatthe nominal stress remains elastic (Sn<Vys) stress concentrations often causeplastic strains to develop in the vicinity of notches where the stress is elevated dueto the stress concentration effect. Due to the constraint imposed by the elasticallystresses material surrounding the notch-tip plastic zone deformation at the notchroot is considered strain basic assumption of the strain -life Fatigue analysis approach is that the fatiguedamage accumulation and the Fatigue life to crack initiation at the notch tip are thesame as in a smooth material specimen (see the Figure) if the Stress-Strain states inthe notch and in the specimen are the same.
a) Specimen b) Notched component 0 yy 0 yy x y z 0 yy ' 22' 2 fb N Nc f ff E HV H ' log(' H/2) log (2N f) H f 0 The Similitude Concept states that if the local notch-tip strain history in the notch tip and the strain history in the
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