BASİT YAPIŞTIRMA BAĞLANTILARINDA YAPIŞTIRICI HASAR KRİTERLERİNİN YÜKSEK DAYANIMLI EPOKSİ YAPIŞTIRICIDA İNCELENMESİ

Year 2023, , 210 - 226, 31.12.2023

İsmail Saraç

https://doi.org/10.54365/adyumbd.1318670

Abstract

Yapıştırma bağlantıları, mekanik bağlantı tekniklerine alternatif oluşturabilecek, endüstrinin birçok alanında kullanımı gittikçe artan bir bağlantı yöntemidir. Yapıştırma bağlantılarının dayanımlarının tahmin edilmesine yönelik ilk çalışmalar, analitik olarak yapılmıştır. Sonra sayısal bir teknik olan sonlu elemanlar yönteminin yaygınlaşmaya başlamasıyla birlikte, yapıştırma bağlantılarının dayanım tahminleri geometri sınırlaması olmadan kapsamlı bir şekilde yapılmaya başlandı. Yapıştırma bağlantılarında hasar tahminleri yapılması amacıyla çok sayıda hasar kriteri literatürde bulunmaktadır. Bu kriterlerin kullanılabilmesi için kritik bölgedeki gerilme veya gerinme dağılımları analitik veya sayısal yöntemlerle hesaplandıktan sonra en uygun kriter belirlenerek hasar tahminleri yapılabilmektedir. Kriter seçiminde bağlantı geometrisi, kullanılan yapıştırıcının mekanik davranışı önemlidir. Ayrıca yapıştırıcı hasar kriterlerinin uygulanabilmesi için yapıştırıcı tabakasının, bağlantının genel mukavemeti içerisinde en zayıf kısım olması gerekmektedir. Bu çalışmada, epoksi yapıştırıcı ve çelik plaka kullanılarak oluşturulan basit yapıştırma bağlantısında, analitik modeller ve sonlu elemanlar yöntemi kullanılarak hasar yükleri elde edilmiştir. Analitik ve sayısal hasar yükleri daha önce yapılan deneysel çalışma sonucunda elde edilen hasar yüküyle karşılaştırılmıştır.

Keywords

Yapıştırma bağlantıları, epoksi yapıştırıcı, yapıştırıcı hasar analizi

INVESTIGATION OF ADHESIVE FAILURE CRITERIA FOR HIGH STRENGTH AN EPOXY ADHESIVE IN SIMPLE ADHESIVE JOINTS

Abstract

Adhesive joints are a fastening method that can be employed as an alternative to mechanical connection techniques and is increasingly used in many areas of the industry. The first studies on estimating the strength of adhesive joints were made analytically. Then, with the widespread use of the finite element method, which is a numerical way, the strength estimates of adhesive joints began to be made comprehensively without any geometry limitation. Numerous damage criteria are present in the literature for damage estimation of adhesive bonds. In order to use these criteria, after the stress or strain distributions in the critical region are calculated by analytical or numerical methods, damage estimates can be made by determining the most appropriate criterion. In the selection of criteria, the connection geometry and the mechanical behavior of the adhesive used are important. In addition, for the adhesive damage criteria to be applied, the adhesive layer must be the weakest part of the overall strength of the joint. In this study, failure loads were obtained using analytical models and finite element method for a simple bonding joint formed by using epoxy adhesive and steel plate. Analytical and numerical damage loads were compared with the damage load obtained as a result of the previous experimental study.

Keywords

Adhesive joints, epoxy adhesive, adhesive failure analysis

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