کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9703960 1463869 2005 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A 'unified' and a (ΔK+·Kmax)1/2 crack growth models for aluminum 2024-T351
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
A 'unified' and a (ΔK+·Kmax)1/2 crack growth models for aluminum 2024-T351
چکیده انگلیسی
The 'unified' approach presented by Vasudevan and Sadananda is used to build an empirical crack growth model for aluminum 2024-T351, based on experimental results published in the literature. This model depicts the existence of two threshold parameters, ΔKth* and Kmaxth*, and provides a method to describe crack growth without any reference to crack closure theories. The crack growth process (crack length as a function of load cycles) is solved numerically. A lower limit of initial crack length a* is found, below which cracks do not propagate. Results were compared to a model based on Walker-Kujawski (ΔK+·Kmax)0.5 parameter, and a very good agreement was found. Some contradiction was found in some of the published experimental results. The results used for curve fitting in the NASGRO program exhibit a slope (of the da/dn vs. ΔK curves) smaller than those described in Kujawski works, and therefore, the NASGRO data yields higher number of cycles to failure. The method described can be used to build empirical crack growth models for other materials, for which experimental data exists, thus providing a practical tool for structures' designers. The model described here will be used in the future to also describe the probabilistic behavior of the crack growth.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Fatigue - Volume 27, Issue 6, June 2005, Pages 629-638
نویسندگان
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