کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4918286 1428756 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Combined effects of sustained tensile loading and elevated temperatures on the mechanical properties of pultruded BFRP plates
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
پیش نمایش صفحه اول مقاله
Combined effects of sustained tensile loading and elevated temperatures on the mechanical properties of pultruded BFRP plates
چکیده انگلیسی
Fiber reinforced polymer (FRP) composites have to face harsh environments and service loading conditions during practical use, causing their mechanical properties to degrade. Mitigating this degradation is critical for the safe design and application of FRP composites. In the present paper, the combined effects of sustained tensile loading and elevated temperatures on the mechanical properties of a pultruded basalt FRP (BFRP) plate were studied. The examined tensile stresses were set at 35%, 50% and 65% of its ultimate tensile strength (fu), and the exposure temperatures were room temperature, 80 °C, 120 °C and 160 °C. Strain was recorded during testing, and variations of the tensile and interlaminar shear (ILSS) properties were studied. The tensile strain evolution of BFRP specimens during sustained tensile loading depended largely on the exposure temperature due to the temperature sensitivity of the epoxy resin. As the exposure temperature increased above the glass transition temperature (Tg) of the composites (123.7 °C), a remarkable increase in strain was observed. Meanwhile, the residual tensile strength and tensile modulus decreased with the exposure temperature and sustained tensile loading level. The tensile strength and tensile modulus decreased by 41.8% and 30%, respectively, for the specimens exposed at 160 °C and 50% fu. Sustained tensile loading led to stress redistribution in BFRP specimens especially at elevated temperatures, leading to serious degradation of the interlaminar shear strength (ILSS). Dynamic mechanical thermal analysis was performed to investigate the interface damage. An equation for predicting the tensile strength retention of BFRP plates under elevated temperatures was also proposed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 150, 30 September 2017, Pages 310-320
نویسندگان
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