کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
831200 1470365 2011 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experimental investigation of random loading sequence effect on fatigue crack growth
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
Experimental investigation of random loading sequence effect on fatigue crack growth
چکیده انگلیسی

An experimental study is proposed to investigate the effect of random loading sequence effect on the fatigue crack growth behavior of Al 7075-T6. The testing matrix includes different overload cycle percentage, overload ratios, and deterministic and random loading sequences in the current investigation. Multiple specimen tests and statistical data analysis are performed to show the effect of random loading sequence on the median and scatter behavior of fatigue crack growth. The proposed experimental study suggests that extreme value distribution is a good approximation of fatigue life distribution. It is observed that the effect of uncertain loading is different under different loading spectrums. For high overload cycle percentage spectrums, the random loading sequence has no major impact on the probabilistic crack growth behavior compared to the deterministic loading sequence with identical load cycle distributions. For low overload cycle percentage spectrums, the random loading sequence has huge impact on the probabilistic crack growth behavior compared to the deterministic loading sequence with identical load cycle distributions, for both the median and the scatter of the fatigue crack length curves. Finally, all experimental observations are reported in table format in Appendix A for future numerical model development and validation for interested readers.


► We investigate the random loading sequence effect on fatigue crack growth.
► Extreme value distribution is found to be a good approximation of fatigue life distribution.
► Random loading sequence has very different effect for different loading spectrums.
► Life scatters increases if the loading spectrum has a low percentage of overload cycles.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials & Design - Volume 32, Issue 10, December 2011, Pages 4773–4785
نویسندگان
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