Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 32, No. 1 (January 2019) 54-61    Article in Press

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  DIAGNOSIS OF DELAMINATED COMPOSITES USING POST-PROCESSED STRAIN MEASUREMENTS UNDER IMPACT LOADING
 
K. Askaripour and M. J. Fadaee
 
( Received: November 26, 2018 – Accepted in Revised Form: January 03, 2019 )
 
 

Abstract    Potentially having a destructive influence on the mechanical properties of composite laminates, the invisible phenomenon of delamination frequently occurs under impact loading. In the present study, simulating the performance of long-gauge fiber Bragg grating sensors, impact-induced average strains within laminated composites are utilized to develop a delamination identification technique. First, strain-based modal parameters are extracted from the estimator of frequency response functions using two different approaches. Next, these parameters are employed in various damage detection indicators. Then, the presence, location, and severity of delamination introduced at locations with the least effect on modal changes are detected. The results of different numerical examples with various delamination sizes and positions elucidate the considerable efficiency of average-strain measurements to diagnose delaminated composites.

 

Keywords    Composite, Delamination Identification, Dynamic Strain, Impact

 

چکیده   

پدیده نامرئی تورق که دارای اثر مخربی روی خواص مکانیکی لمینیت‌های کامپوزیت است به طور مکرر تحت بارگذاری ضربه‌ای رخ می‌دهد. در مطالعه فعلی، با شبیه‌سازی عملکرد سنسورهای فیبری شبکه براگ با طول زیاد، کرنش‌های متوسط ناشی از ضربه در کامپوزیت‌های لایه‌ای برای توسعه تکنیک شناسایی تورق استفاده می‌شوند. ابتدا، پارامترهای مودال مبتنی بر کرنش از توابع پاسخ فرکانسی با استفاده از دو روش مختلف استخراج می‌شوند. سپس، این پارامترها در شاخص‌های شناسایی آسیب مختلف بکار می‌روند. بعد از آن، حضور، موقعیت و شدت تورق معرفی‌شده در موقعیت‌های با کمترین تاثیر روی تغییرات مودال شناسایی می‌شوند. نتایج مثال‌های عددی مختلف بیانگر کارایی قابل توجه سنجش‌های کرنش متوسط برای شناسایی کامپوزیت‌های متورق‌شده هستند.

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