Nahit ÖZTOPRAK, Gökçe Mehmet GENÇER

37344

Termoplastik Kompozit ve Lazer Uzaklaştırmalı Yüzey Ön İşlem Uygulanmış AA5754-H111 Arasındaki Bindirme Şeklinde Farklı Birleştirmelerin Kırılma Morfolojisi

Sıcak presleme geleneksel montaj tekniklerinin yerine doğrudan birleştirme yöntemi olarak metalik ve polimerik malzemeleri yapıştırmak için başarıyla önerilmektedir. Bu makale, çekme-kesme yüklemesine maruz kalan tek bindirmeli bağlantıların hasar mekanizması analizi üzerine deneysel bir araştırmayı bildirmektedir. Yapıştırılan malzemeler H111 durumunda Al5754 alaşımı ve uzun cam elyaf takviyeli polipropilen (PP) kompozittir. Bağlantı dayanımını arttırmak için metal yüzeye lazer işlemi uygulanmaktadır. Yüzey modifikasyonu için art arda sekiz kez tarama ile bir ızgara doku modeli kullanılmaktadır. Farklı bağlantının üretiminden sonra, metal-polimer hibrit yapının yarı statik mekanik performansı çekme-kesme testi ile açıklanmaktadır. Sonrasında, kırılma yüzeylerinin morfolojisi taramalı elektron mikroskopisi (SEM) ile değerlendirilmektedir. Deneysel bulgular lazer ile işlenmiş yüzey dokusunun bu tür metal/polimer çoklu malzeme bağlantılarında mikro kenetleme yoluyla güçlü bağlantılar elde etmek için üstün bir aday olduğunun kanıtlandığını ortaya koymaktadır. Nihai kuvvet 20 W lazer yüzey ön işleminden sonra 1515.10 N değerine ulaşmaktadır.
Anahtar Kelimeler:

Tek bindirmeli bağlantılar, Sıcak presleme, Lazer ile uzaklaştırma işlemesi, Kırılma yüzeyi

Fracture Morphology of Single-Lap Dissimilar Joints Between Thermoplastic Composite and AA5754-H111 with Laser Ablation Surface Pre-Treatment

Hot pressing is successfully proposed to bond metallic and polymeric materials as a direct-joining method to replace conventional assembly techniques. This article reports an experimental investigation on the failure mechanism analysis of single-lap joints (SLJs) subjected to tensile-shear loading. Al5754 alloy in H111 condition and long glass fiber reinforced-polypropylene (PP) composite are chosen as the adherends. In order to enhance the bond strength, laser processing is applied to the metal surface. A grid texture model by eight consecutive times scanning is utilized for the surface modification. After fabrication of the dissimilar joint, quasi-static mechanical performance of the metal-polymer hybrid structure is elucidated through tensile-shear testing. Thereafter, morphology of the fracture surfaces is evaluated by scanning electron microscopy (SEM). The experimental findings reveal that the laser surface texturing is proved to be an outstanding candidate for achieving strong joints through micro-interlocking in such metal/polymer multi-material connections. The ultimate force reaches the value of 1515.10 N after the 20 W laser surface pre-treatment.
Keywords:

Single lap joints, Hot pressing, Laser ablation treatment, Fracture surface,

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Karaelmas Fen ve Mühendislik Dergisi-Cover
  • ISSN: 2146-4987
  • Yayın Aralığı: Yılda 2 Sayı
  • Başlangıç: 2011
  • Yayıncı: ZONGULDAK BÜLENT ECEVİT ÜNİVERSİTESİ
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Nahit ÖZTOPRAK, Gökçe Mehmet GENÇER