دانش و فناوری هوافضا

دانش و فناوری هوافضا

بررسی ضرایب تمرکز تنش مکانیکی و الکتریکی دربرداشت انرژی از موادپیزوالکتریک شامل ترک با استفاده از روش اجزا محدود

نوع مقاله : مقاله پژوهشی

نویسندگان
مجید جباری 1
امید رئوفی 2
1 استادیار، گروه مکانیک، واحد خمینی‌شهر، دانشگاه آزاد اسلامی، خمینی شهر، اصفهان
2 کارشناسی ارشد، گروه مکانیک، واحد خمینی‌شهر، دانشگاه آزاد اسلامی، خمینی شهر، اصفهان
چکیده
با کاربرد پدیده پیزوالکتریک به عنوان مولد انرژی الکتریکی و یا مولد حرکت ارتعاشی تحقیقات برای افزایش کارآیی این پدیده ادامه دارد. یکی از عوامل موثر در کارآیی تولید انرژی، ایجاد ترک در مواد پیزوالکتریک به عنوان موقعیت تمرکز تنش می­باشد.  در این مقاله به بررسی ارتباط بین وجود نقاط تمرکز تنش و برداشت انرژی الکتریکی در مواد پیزوالکتریک پرداخته می­شود. با توسعه کد عددی ضرایب شدت تنش مکانیکی و الکتریکی و رفتار آنها برای حالات مختلف قرارگیری ترک و طول آن در مواد پیزوالکتریک در شرایط بارگذاری­های مکانیکی و الکتریکی با دو روش روش انطباق نقطه ای و انتگرال J حاصل می­شود. طبق نتایج خطای حاصل از روش انطباق نقطه­ای 4/6 و انتگرال J  مقدار 2/9 درصد با ترک داخلی تحت بارگذاری مرکب می­باشد. حالات دیگر نیز مورد بررسی قرار گرفت و ضرایب تمرکز تنش مکانیکی و الکتریکی با تغییر شرایط اعمال تنش و شرایط فیزیکی ترک تغییر می­کند .
کلیدواژه‌ها
الگوریتم ژنتیک
روش عددی
پیزوالکتریک
بهینه سازی
ولتاژ

موضوعات

عنوان مقاله English

Investigation of mechanical and electrical stress concentration coefficients of energy harvesting from piezoelectric materials including cracks using the finite element method

نویسندگان English

majid jabbari 1
omid raoufi 2
1 Assistant Professor, Department of Mechanical Engineering, Kho.C., Islamic Azad University, Khomeinishahr, Iran.
2 Master, Department of Mechanical Engineering, Kho.C., Islamic Azad University, Khomeinishahr, Iran, Iran.
چکیده English

With the application of the piezoelectric phenomenon as a generator of electric energy or as a generator of vibrational motion, the research on increasing the efficiency of this phenomenon is always ongoing. One of the effective factors in the efficiency of energy production is the occurrence of cracks in piezoelectric materials, as a stress concentration situation.  In the article, the relationship between the presence of stress concentration points and electrical energy harvesting in piezoelectric materials is investigated. From the results, it is possible to find the intensity coefficients of mechanical and electrical stress and study their for different conditions crack and its  length in piezoelectric materials and in the conditions of mechanical and electrical loading. According to the results, the error obtained from the point matching method is 4.6 and the J integral is 2.9 percent with internal cracking under compound loading. The results show that the mechanical and electrical stress concentration coefficients change with the change of the stress application conditions, the crack and the material.

کلیدواژه‌ها English

Genetic algorithm
Numerical method
Piezoelectric
Optimization
Voltage
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