Tezin Türü: Yüksek Lisans
Tezin Yürütüldüğü Kurum: Kocaeli Üniversitesi, Mühendislik Fakültesi, Makina Mühendisliği, Türkiye
Tezin Onay Tarihi: 2023
Tezin Dili: İngilizce
Öğrenci: Çağatay AÇIKGÖZ
Danışman: Alpay Tamer Ertürk
Özet:
Composite
materials are used in many different areas of industry because they can provide
higher strength strengths while being lighter than traditional materials. They
are basically formed by the combination of at least two different materials and
are therefore heterogeneous.
In order to
determine whether composite materials can work under certain service
conditions, their mechanical properties must be well calculated and known. For
this reason, analytical and numerical approaches with different assumptions and
based on different foundations have been presented in scientific records. Similarly,
Classical Lamination Theory has been introduced in order to be able to make the
transition from micro to macro dimension, that is, to calculate mechanical features
of laminate. The decrease in mechanical strength of composites can occur in two
ways, either due to manufacturing problems or as a result of extreme loading.
Damage to
composite materials can take different forms. Generally, they occur in the form
of consecutive damages and cause deterioration in the structure. This induces a
decreasing in the mechanical features of the material and a change in its
natural frequencies.
In this study,
the calculation methods of composite materials will be compared and the specimens
will be characterised. Then, these specimens will be damaged in three-point
bending test and their natural frequencies will be compared according to the
damaged and undamaged conditions.