Effect of ply types and micro-Nano sio2 particles on interlaminar fracture toughness of epoxy reinforced by glass fiber composites
العناوين الأخرى
تأثير أنواع الطبقات و الجسيمات المايكروية-النانوية على متانة التكسر الطبقية لمتراكبات الايبوكسي المدعم بالألياف الزجاجية
مقدم أطروحة جامعية
al-Sabbagh, Zaynab Rahim Muslim
مشرف أطروحة جامعية
al-Shammari, Harith Ibrahim Jafar
الجامعة
جامعة بغداد
الكلية
كلية العلوم
القسم الأكاديمي
قسم الفيزياء
دولة الجامعة
العراق
الدرجة العلمية
دكتوراه
تاريخ الدرجة العلمية
2013
الملخص الإنجليزي
The effect of mid- plane layer, lay –up stacking sequence and the addition of micro and nano SiO2 particles on the interlaminar fracture toughness ,Young modulus and flexural strength for epoxy resin composites reinforced with glass fiber type woven roving mat or mat [M] and chopped strand mat or random [R] have been studied.
Specimens were prepared using hand-lay up technique arranged with respect to fibers orientation and with 16 plies .
Seven sets of specimens were prepared such as [M]16 , [R]16 [R7//M1/M1//R7] ،[M7//R1/R1//M7],[//M/R//]s,[M/R//M1/M1//R/M]S and [R/M//R1/R1//M/R]S.
Interlaminar fracture toughness GIC were measured using double cantilever beam (DCB) test for mode- I using area method, compliance method, compliance calibration method and modified beam theories.
The results showed that epoxy reinforced with random glass fiber has higher GIC (2834 J/m2) than that of epoxy reinforced with woven roving glass fiber (548 J/m2).
The results of different types of mid plane layers show that the Interlaminar fracture toughness GIC for [R7//M1/M1//R7]is (3018 J/m2) which is higher than that of [M7//R1/R1//M7] is(354 J/m2) .
It was shown also that lay – up stacking sequences have an effect on the Interlaminar fracture toughness GIC .
It was observed that GIC for [R/M//R1/R1//M/R]S is (1355 J/m2)which is higher than that [//M/R//]s is (260 J/m2) .
6 Traveling microscope was used to study the behavior of crack propagation.
Fiber bridging phenomena was seen in random composites and the composites with random glass fiber mid layer.
Fast and unstable crack propagation was seen in woven roving composites in comparison with random composites, which mean that random composites have high resistance for crack propagation.
Nano and micro SiO2 particles were used as a third phase filler for woven roving glass fiber composites with (2,4,6,8,10) wt % .
It was found that higher GIC was observed for nanocomposites as compared with microcomposites ,because nano SiO2 behave as a barrier for crack propagation and the large surface density of these nanoparticles take a position in the polymeric chain restricting the movement for these chains leading to higher values of GIC in comparison with micro SiO2 .The lower value of GIC found in 6 and 8 wt% because of the agglomeration of nano particles , this reflects the behavior of laminated nanocomposites into the same as microcomposites.
Young modulus and flexural strength were measured using transverse loading.
The specimens were cut along the y-direction to study the effect of mid –plane layer on crack propagation and behavior using 3- point bending test .
Higher flexural strength was found for [M]16 .
The results shows that Young modulus for nanocomposites was higher than microcomposites , but flexural strength for microcomposites was higher.
التخصصات الرئيسية
عدد الصفحات
155
قائمة المحتويات
Table of contents.
Abstract.
Abstract in Arabic.
Chapter One : Introduction to composites.
Chapter Two : Fracture mechanics.
Chapter Three : Experimental part.
Chapter Four : Results, discussion and conclusions.
References.
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
al-Sabbagh, Zaynab Rahim Muslim. (2013). Effect of ply types and micro-Nano sio2 particles on interlaminar fracture toughness of epoxy reinforced by glass fiber composites. (Doctoral dissertations Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-608152
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
al-Sabbagh, Zaynab Rahim Muslim. Effect of ply types and micro-Nano sio2 particles on interlaminar fracture toughness of epoxy reinforced by glass fiber composites. (Doctoral dissertations Theses and Dissertations Master). University of Baghdad. (2013).
https://search.emarefa.net/detail/BIM-608152
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
al-Sabbagh, Zaynab Rahim Muslim. (2013). Effect of ply types and micro-Nano sio2 particles on interlaminar fracture toughness of epoxy reinforced by glass fiber composites. (Doctoral dissertations Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-608152
لغة النص
الإنجليزية
نوع البيانات
رسائل جامعية
رقم السجل
BIM-608152
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
أضخم قاعدة بيانات عربية للاستشهادات المرجعية للمجلات العلمية المحكمة الصادرة في العالم العربي
تقوم هذه الخدمة بالتحقق من التشابه أو الانتحال في الأبحاث والمقالات العلمية والأطروحات الجامعية والكتب والأبحاث باللغة العربية، وتحديد درجة التشابه أو أصالة الأعمال البحثية وحماية ملكيتها الفكرية. تعرف اكثر