@article { author = {Amin Yazdi, Seyed mohamad ali and Mousavi, Seyed Bagher}, title = {Aeroelastic instability of symmetric laminated beam-plates with two delaminations ‎}, journal = {Iranian Journal of Mechanical Engineering Transactions of ISME}, volume = {21}, number = {3}, pages = {181-196}, year = {2019}, publisher = {ISME}, issn = {2538-4775}, eissn = {}, doi = {}, abstract = {In this study aeroelastic instability of laminated beam-plates with two overlapping delaminations with equal length that is subjected to supersonic ‎flow is investigated analytically. The classical laminate plate theory with small deflection assumptions with quasi-steady aerodynamic theory is ‎utilized to derive the governing equations of the system. Additionally, it is assumed that the delaminations parts are forced to vibrate with each other. ‎In this case to predict critical flutter pressure, the delaminated composite beam-plates are divided into five parts. The boundary conditions at the ‎ends of beam-plates and at the ends of each delamination region are employed to predict flutter pressure. The effect of different parameters such as ‎delaminations length, axial position, their position through thickness of delaminated beam-plate and different stacking sequence are considered on ‎flutter pressure of beam-plate with two overlapping delaminations. According to the results, flutter pressure of delaminated beam-plate with two ‎overlapping, equal length delaminations in comparison to beam-plate with single delamination is reduced 20 through 40 percentages approximately. ‎Additionally, it has been shown, as far as two delaminations are closer to the mid-plane of the beam-plate, the aeroelastic behavior will change ‎further. ‎}, keywords = {Flutter,Composite beam-plates,Delaminations,supersonic flow}, title_fa = {ناپایداری ائروالاستیک تیر-صفحه چند لایه متقارن مرکب با دو ناحیه جدایش ‏بین لایه ای}, abstract_fa = {دراین‎ ‎مطالعه ناپایداری ائروالاستیک تیرصفحه های مرکب با دو ناحیه جدایش بین لایه ای با طول یکسان لبه ‏به لبه و در جریان مافوق ‏صوت بصورت تحلیلی بررسی شده است. تئوری کلاسیک صفحه ‏های چند لایه برای جابجایی های کوچک به همراه تئوری شبه ‏یکنواخت آیرودینامیکی برای استخراج معادلات ‏حاکم استفاده شده است. در این تحقیق اثر پارامترهای متفاوتی بر مرز فلاتر مورد ‏‏بررسی قرار گرفته است. بر اساس نتایج بدست آمده وجود دو ناحیه جدایش سرتاسری با طول یکسان و لبه به ‏لبه سبب کاهش 20 تا ‏‏40 درصدی فشار بحرانی فلاتر در مقایسه با یک ناحیه جدایش میشود.}, keywords_fa = {فلاتر,جدایش بین لایه ای,تیر-صفحه مرکب‎,حریان مافوق صوت}, url = {https://jmep.isme.ir/article_37953.html}, eprint = {https://jmep.isme.ir/article_37953_fe00300516eea4f828ebf2c4635de456.pdf} }