کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8129808 | 1523178 | 2019 | 33 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Enhancement in mechanical quality factors of poly phenylene sulfide under high-amplitude ultrasonic vibration through thermal annealing
ترجمه فارسی عنوان
افزایش کیفیت عوامل مکانیکی سولفید پلی فنیل تحت ارتعاش اولتراسونیک با دامنه بالا از طریق آنیلینگ حرارتی
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
آکوستیک و فرا صوت
چکیده انگلیسی
Our previous study shows that poly phenylene sulfide (PPS) provides relatively high mechanical quality factors (Q factors) at ultrasonic frequency compared to other commonly-used functional polymers, and has potential as the vibrating body of a functional ultrasonic transducer. Since PPS has semicrystalline frameworks, its Q factors may be enhanced through thermal annealing. Prior to examining this feasibility, we developed a method for estimating Q factors under high-amplitude longitudinal vibration. Q factor is originally defined as the ratio of the reactive energy to the dissipated energy, both of which are calculated from the vibration velocities on the outer surface of a cylindrical specimen. Using this method, we experimentally investigated how annealing temperatures and times affect Q factors of PPS. The results demonstrate that thermal annealing is an effective way to enhance Q factors of PPS at the heating temperatures of 100â¯Â°C and 150â¯Â°C, relatively high compared to the glass transition temperature of PPS (90-95â¯Â°C). The Q factors at several tens of kilohertz are almost doubled after annealing owing to the enhancements in degrees of crystallinity. As the annealing time increases, the Q factors initially become higher, and gradually approach their saturated values at a sufficiently long time. Besides, annealing temperatures affect the change rates in Q factors, but have no observable effect on the saturated Q factors.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics - Volume 91, January 2019, Pages 52-61
Journal: Ultrasonics - Volume 91, January 2019, Pages 52-61
نویسندگان
Jiang Wu, Yosuke Mizuno, Kentaro Nakamura,