کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
808710 | 1468320 | 2015 | 7 صفحه PDF | دانلود رایگان |
• A critical-plane criterion for multiaxial fatigue characterised by low number of loading cycles is discussed.
• An equivalent strain quantifies the fatigue damage.
• The effective Poisson ratio influence on the fatigue life estimation is evaluated.
• Fatigue test data on metallic hallow specimens under biaxial fatigue are compared with the theoretical results.
A critical-plane criterion for multiaxial fatigue regimes characterised by low number of stress cycles is discussed. Such a criterion is formulated in terms of strains, by obtaining the displacement components acting on the critical plane from the strain tensor and, then, by considering an equivalent strain as a parameter to quantify the fatigue damage. Since the metallic materials generally behave in a plastic manner in low-cycle regime, the effective Poisson ratio has to be taken into account when defining the strain tensor. The theoretical results are here determined by varying the value of such a parameter in order to assess its influence on the fatigue life estimation. The effectiveness of the criterion is evaluated through experimental data related to fatigue tests on metallic hollow specimens under biaxial fatigue.
Journal: Theoretical and Applied Fracture Mechanics - Volume 79, October 2015, Pages 77–83