Akademik Veri Yönetim Sistemi
Tez Türü: Yüksek Lisans
Tezin Yürütüldüğü Kurum: Adana Alparslan Türkeş Bilim Ve Teknoloji Üniversitesi, Lisansüstü Eğitim Enstitüsü, Makine Mühendisliği, Türkiye
Tez Danışmanı: Doç. Dr. Cem Boğa
Tezin Onay Tarihi: 2022
Tezin Dili: İngilizce
Desteklendiği Program: Diğer
Özet:
Fused
Deposition Modeling (FDM) is steadily increasing its usage in manufacturing
since it enables flexibility in design and significantly shortens the amount of
time needed from the design phase to the first production. Like many manufacturing
methods, the process comes along with some drawbacks, one of them being
weaknesses in mechanical properties mostly caused by anisotropy due to the
nature of the method. Nevertheless,
there are many novel efforts made for overcoming these difficulties such as the
inclusion of nanoparticles in the feedstock of the process which is the
filament. By including these nanoparticles, researchers aim to enhance the
relatively weak properties of the parts produced with Fused Deposition
Modeling. Furthermore, the use of parts manufactured with this method is taking
place in the Automotive and Aeronautics industries as well which requires
low-weight but durable parts. Along with reliability, an important
characteristic of the parts used in these industries is vibrational behavior,
since these parts are subjected to intense vibration frequently. It is a known
fact that if vibration caused by external forces on a part coincides with the
natural frequency of the part then a phenomenon called resonance occurs causing
devastating effects.
In
this study, two types of nanocomposite cantilever beams composed of
Acrylonitrile Butadiene Styrene (ABS) containing Calcium Carbonate (CaCO3) nanoparticles of
1%, 2%, 3%, and 5% in weight fraction and ABS containing Carbon Black (CB)
nanoparticles of 0.3%, 1% and 2% in weight fraction were manufactured by FDM
method. The filaments used for these beams were fabricated in-house with the
material extrusion method. The cantilever beams were physically tested for
determining the effect of nanoparticle addition on vibrational behavior
regarding natural frequency and damping ratio values. Along with the physical
tests, the natural frequency values of the beams were also numerically
calculated with ANSYS software for validation. The results showed that CB
nanoparticle content in ABS resulted in an increase in the damping ratio of the
beams compared to pure ABS beams with a maximum value obtained in 0.3wt% CB
nanocomposite beams with a 39.6% increase in the damping ratio value however,
it had a small influence on the natural frequency value of the beams. The CaCO3
content in the matrix also provided a maximum of 11.1% increase in the
damping ratio with 5wt% CaCO3 content. In terms of natural frequency
values, it was concluded that the addition of CaCO3 nanoparticles
has a limited effect on the parameter.