کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7171566 | 1463712 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The effect of compression loading on fatigue crack propagation after a single tensile overload at negative stress ratios
ترجمه فارسی عنوان
اثر بار فشرده سازی بر روی انتشار ترک خستگی پس از یک بار اضافه بار کششی در مقادیر منفی استرس
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کلمات کلیدی
انتشار کراک، بارگذاری دامنه متغیر نسبت تنش منفی، اندازه منطقه پلاستیکی، تجزیه و تحلیل عنصر محدود،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی مکانیک
چکیده انگلیسی
Experiments on fatigue crack propagation under a loading history with a single tensile overload at an overload ratio of ROLâ¯=â¯1.8 were performed at different baseline stress ratios of Râ¯=â¯0, â0.25, and â1 for aluminium alloy 2A12-O. The widely accepted fatigue crack propagation retardation due to a single tensile overload (OL) in the case of a positive stress ratio (R) was observed at Râ¯=â¯0. However, the retardation effect gradually decreased from Râ¯=â¯0 to Râ¯=â¯â0.25 and disappeared at Râ¯=â¯â1. These results indicate that the applied compressive load has a significant effect on the fatigue crack propagation after a single tensile overload for aluminium alloy 2A12-O. To reveal the mechanism of this effect of compression loading, a detailed elastic-plastic finite element (FE) analysis was performed. Based on the results of finite element analysis, a mechanism of additional reverse plastic damage caused by compression loading was proposed to explain the interaction of tensile overload and compressive load. The parameter of reverse plastic zone size was applied to characterize the additional reverse plastic damage. A parameter describing the effect of compression loading on fatigue crack propagation retardation due to a single tensile overload was developed. Using this parameter it was verified that the mechanism of additional reverse plastic damage is effective to explain the compression loading effect on the fatigue crack propagation retardation due to a single tensile overload.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Fatigue - Volume 110, May 2018, Pages 162-171
Journal: International Journal of Fatigue - Volume 110, May 2018, Pages 162-171
نویسندگان
Shigang Bai, Yu Sha, Jiazhen Zhang,