کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7171569 1463713 2018 30 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fatigue damage in angle-ply GFRP laminates under tension-tension fatigue
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Fatigue damage in angle-ply GFRP laminates under tension-tension fatigue
چکیده انگلیسی
The fatigue behavior of (±45)2S angle-ply glass/epoxy composite laminates was investigated. Rectangular specimens were subjected to constant amplitude fatigue loading at different stress levels, with stress ratio 0.1 until failure. A video-extensometer and an infrared thermal camera were employed respectively to measure the evolution of strain and the self-generated temperature during the fatigue experiments. Using a digital camera and microscope, the progression of damage at the different locations and the fracture surfaces were also studied. At higher stress levels the damage was severe and localized and caused fiber pull-out failure at short lifetimes; however, by decreasing the fatigue stress level, a more uniform distribution of less severe damage was observed and fiber breakage prevailed, which led to a longer fatigue life. When the number of cycles was increased, the fatigue stiffness dropped at a higher rate at higher stress levels at the same age due to the localized and intense damage growth. The fatigue stiffness at failure, however, decreased more at lower stress levels than at higher ones, which was attributed to the material's greater capacity to withstand damage. The dissipated energy increased with the number of cycles and fatigue stress level due to more friction in the area of the unbounded regions; the magnitude of the total energy dissipation (TDE) however significantly decreased as the fatigue stress level increased.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Fatigue - Volume 109, April 2018, Pages 60-69
نویسندگان
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