کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7716572 | 1497469 | 2015 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Combined effects of environmental vibrations and hygrothermal fatigue on mechanical damage in PEM fuel cells
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
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چکیده انگلیسی
Automotive polymer electrolyte membrane (PEM) fuel cells are exposed to high magnitude road-induced impact loads and vibrations as well as high-level cyclic stresses due to humidity and temperature (hygrothermal) variations. The consequent plastic strain can exacerbate defects and may result in operational failure. In this study, a two-dimensional finite element model based on cohesive zone theory was employed to investigate the combined effects of hygrothermal cycle amplitude and amplitude and frequency of external vibrations on damage propagation. The simultaneous presence of hygrothermal cycles and vibrations severely intensified damage propagation within the expected fuel cell lifetime. Compared with applied vibrations, hygrothermal cycles produced a dominating effect on degradation. Under hygrothermal cycling, membrane cracks experienced more severe propagation compared to delaminations, while vibrations had a more significant effect on delaminations compared to cracks. The presence of a channel offset led to a 2.5-fold increase in delamination length compared to a case with no channel offset.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 40, Issue 4, 30 January 2015, Pages 1911-1922
Journal: International Journal of Hydrogen Energy - Volume 40, Issue 4, 30 January 2015, Pages 1911-1922
نویسندگان
Roshanak Banan, Aimy Bazylak, Jean Zu,