Thesis Defense - Umut Özkan ( MSME)

Umut Özkan - M.Sc.Mechanical Engineering

Assoc. Prof. Güney Güven Yapıcı – Advisor

Date: 25.08.2020

Time: 15:00

Location: This meeting will be held ONLINE. Please send an e-mail to gizem.bakir@ozyegin.edu.tr  to participate in this defense.

Manufacturing, Mechanical Behavior and Failure Analysis of Ultrasonic Welded Carbon Fiber Reinforced Thermoplastic Composite

Thesis Committee:

Assoc. Prof. Dr. Güney Güven YAPICI, Özyeğin University

Dr. Görkem Yılmaz, Özyeğin University

Dr. Mehmet İpekoğlu, Turkish-German University

Abstract:

The requirement for utilizing high-performance thermoplastic composites (TPCs) from different industries has risen in the last years due to their excellent mechanical properties. Although improving mechanical characteristics of TPCs is a promising development for future engineering applications, great attention has to be given on determining appropriate fabrication and joining techniques due to limitations in manufacturing technology. On the other hand, despite several research works have been carried out investigating the mechanical properties of various short carbon fiber reinforced (SCFR) TPCs, the lack of knowledge about the effects of processing parameters of compression molding (CM) and ultrasonic welding (USW) on the mechanical performance of TPCs was the motivation of this thesis.

According to the mechanical tests to define tensile and impact characteristics, it was concluded from the first stage of this thesis that the tensile response of compression molded samples was found to be highly dependent on carbon fiber content and molding temperature, whereas impact properties were mostly affected by molding pressure. With input from the first stage, molded samples were ultrasonically welded in lap configuration to reveal the joint strength under shear. Up to 7.67 MPa lap shear strength (LSS) is achieved by experiments where welding pressure and duration were seen to have the most significance. On the other hand, energy dissipation during welding was also considered as high levels resulted in structural degradation. The mechanical responses of molded and welded samples were discussed in light of detailed fracture analysis considering the fiber-matrix interface.

Short-Bio: 

The author was born on the 5th of January 1992, in Izmir, Turkey. He obtained his B.Sc. in Mechanical Engineering from Izmir Institute of Technology in 2015. After graduation, he started to work at MAT Filtration Systems located in Guzelbahce, Izmir in 2015 as a Mechanical Design Engineer After that, he shifted the working company and started to work at Vestel White Goods Inc., Dishwasher Factory, R&D Department as Mechanical Design Engineer in August 2016. Since 2017, he has worked both at the same company and pursued his M.Sc. degree in Mechanical Engineering at Ozyegin University. At the same time, he has been working in MEMFIS group at Ozyegin University.

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Kişisel Verilerin Korunması/Aydınlatma Metni

Özyeğin Üniversitesi Fen Bilimleri Enstitüsü bünyesindeki programlarda, izleyici olarak katılınan online platformlarda gerçekleştirilen aleni akademik faaliyetlerin sadece idari ve yasal yükümlülüklerin yerine getirilmesi amacıyla kayıt altına alındığı, söz konusu kayıt ile elde edilen kişisel verilerin ilgililer tarafından başka bir amaçla kullanılamayacağı hususunda şahsınızı aydınlatır, toplantıya gönüllü katılım ile bu hususu beyan ve taahhüt etmiş olduğunuzu belirtir, gereğini önemle rica ederiz. 

Fen Bilimleri Enstitüsü