کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5205804 | 1502935 | 2016 | 57 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Repetitive impact exposure and characterization of stress-whitening of an American football helmet outer shell material
ترجمه فارسی عنوان
قرار گرفتن در معرض تأثیر تکراری و مشخص کردن تنش سفید کردن یک پوسته بیرونی کلاه ایمنی فوتبال آمریکایی
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کلمات کلیدی
استرس سفید کردن رطوبت لاستیک، کلاه ایمنی فوتبال آمریکایی، تخریب پوسته بیرونی، عملکرد تاثیر،
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
چکیده انگلیسی
Mechanical stress exerted upon impact-modified polycarbonate (PC) and poly(ethylene terephthalate) (PET) blends has been reported to generate microscopic voids via rubber-toughener (RT) particle cavitation which can macroscopically manifest to visibly whiten the material. Previous work has revealed a whitening phenomenon in collegiate American football helmet outer shells after a single season and in helmet-grade plaques following linear impact testing. The purpose of this research was to quantify the effects of repetitive linear drop exposures on the (i) impact performance; (ii) physical and thermal properties; and (iii) surface and tensile mechanical properties of a stress-whitened American football helmet outer shell material. Statistically significant changes in plaque impact performance corresponded to substantial stress-whitening that penetrated up to 40-45% into the plaque thickness and elicited shifts in surface and tensile mechanical properties. Nanoscale microscopy revealed elongation of the PC/PET matrix and delamination at the RT-matrix interface. Thermal property analysis suggested the concomitant occurrence of RT cavitation and strain-induced PET crystallization. Overall, the research identified a battery of diagnostic tools to characterize material property changes of stress-whitening in rubber-toughened helmet outer shell materials.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Testing - Volume 55, October 2016, Pages 190-203
Journal: Polymer Testing - Volume 55, October 2016, Pages 190-203
نویسندگان
D.E. Krzeminski, B.M.D. Fernando, G. Curtzwiler, T.E. Gould, S.G. Piland, J.W. Rawlins,