EFFECT OF STRAIN HARDENING CAPACITY ON FATIGUE LIFE OF STRUCTURAL STEEL | ||||
| ERJ. Engineering Research Journal | ||||
| Article 1, Volume 24, Issue 3, July 2001, Page 1-11 PDF (417.2 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/erjm.2001.71042 | ||||
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| Author | ||||
| M. H. Seleem | ||||
| Materials Engineering Department, Faculty of Eng., Zagazig University, Zagazig, Egypt | ||||
| Abstract | ||||
| A single edge cracked panel subjected to monotonic and cyclic loading has been analyzed using two-dimensional elastic-plastic finite element program. The effect of strain hardening exponent on the stress-strain and the deformation behavior at the crack tip ws studied at different maximum applied stress ranges. The analysis was performed for the plane stress state at constant amplitude loading of zero stress ratio. Relevant kinematic parameters corresponding to loading and unloading phases of a cycle were computed and correlated. Parameters controlling the fatigue life of the structural elements, i.e. plastically deformed zone and crack tip opening displacement were estimated and correlated. The results indicated that with increasing the strain hardening exponent, the normal tensile stress decreases within the crack tip plastic zone while the normal tensile strain showed ah opposite trend. Also the normal tensile stress tends to be constant inside the monotonic plastic zone at the higher values of the strain hardening exponent irrespective of the value of the applied stress range. The results also show that the crack tip opening displacement increases with increasing the strain hardening exponent, whilst the plastic zone showed an opposite trend. Those behaviors were analyzed for their correlation. A previously developed crack tip deformation parameter to correlate fatigue crack growth was modified to include the effect of strain hardening capacity of the material, | ||||
| Keywords | ||||
| Finite element method; Cyclic loading; strain hardening; crack tip plastic deformation | ||||
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