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Öğe Behaviour of bi adhesive in double strap joint with embedded to bending(Journal of Theoretical and Applied Mechanics, 2015-06-15) Adin, Hamit; Temiz, Şemsettin; Sülü, İsmail YasinIn this study, behaviour of bi-adhesive used in the repair of damaged parts was analyzed, using the finite element method. In a double-strap joint with an embedded patch, patch is embedded into the adherents for structural requirements. In addition, to increase the strength of the joint, two adhesives are used to bond the adherents. This approach reduces stress concentration at the overlap ends, increases the load capacity and delays the failure. These effects give rise to higher joint strength. For this purpose, a stiff adhesive, FM73 produced by Cytec Fiberite, was applied in the middle portion of the overlap, while a softer adhesive, SBT9244 from 3M, was applied towards the edges, prone to stress concentrations. Non-linear finite element analyses were carried out to predict the failure loads, to assist with the geometric design and to identify effective ratios of sizes to maximize joint strength. Key words: Bi-adhesive, double-strap joints, finite element analysis, mechanical properties, stress analysis, failure loadsÖğe Sürtünme karıştırma kaynak yöntemi ile birleştirilmiş AA5182/AA7075 alaşım bağlantılarının mekanik özelliklerinin incelenmesi(Dicle Üniversitesi, 2019-06-20) Çelik, Yahya Hışman; Temiz, Şemsettin; Çetkin, EdipBu çalışmada farklı özelliklere sahip AA5182 ve AA7075 alüminyum alaşımları, sürtünme karıştırma kaynağı (SKK) yöntemiyle alın pozisyonunda birleştirilmiştir. Yapılan birleştirmelerde karıştırıcı ucun dönme devri, kaynak ilerleme hızı ve karıştırıcı uç geometrisi değiştirilerek farklı mekanik ve mikroyapı özelliklerine sahip birleştirmeler elde edilmeye çalışılmıştır. SKK yöntemi ile birleştirilen kaynaklı bağlantılarda kaynak ilerleme hızının, karıştırıcı ucun dönme devrinin ve uç geometrisinin mekanik davranışlar üzerine olan etkisini tespit etmek amacıyla numunelere çekme testi uygulanmıştır. Ayrıca taramalı elektron mikroskobu (SEM) kullanılarak çekme testi sonucunda kırılan numunelerin yüzey mekanizmaları belirlenmiştir. Çekme test sonuçlarından elde edilen verilerden, AA5182 ve AA7075 alüminyum alaşımlarının SKK yöntemiyle ile birleştirilmesinde, uygun dönme devrinin, ilerleme hızı ve uç geometrisi kombinasyonunun kaynak kalitesini arttırdığı görülmüştür. Ayrıca konik helisel uç kullanılarak 980 dev/dk dönme devri ve 108 mm/dk ilerleme kaynak parametreleri ile birleştirilen numunelerin çekme test deneylerinde en yüksek hasar kuvveti 16468 N olarak elde edilmiştirÖğe Experimental determination of the static and fatigue strength of theadhesive joints bonded by epoxy adhesive including different particles(Elsevier, 2018-12) Adin, Hamit; Saraç, İsmail; Temiz, ŞemsettinBecause of their many advantages, adhesively bonded joints are intensively used in many engineeringfields. So,the mechanical research of the adhesively bonded joints is very important to use these joints safely. There aremany studies performed by researchers to investigate the mechanical properties of the adhesive joints. There hasbeen a considerable interest in nanoparticles added to structural adhesives recently because nanoparticles im-prove the mechanical properties of adhesives and joints. In this paper, different nanoparticles reinforced byepoxy adhesive, and neat adhesive were used to produce single lap joints. The static and fatigue strengths ofsingle lap joints incorporating nanoparticles were compared to those without nanoparticles. Experiments wereperformed at 20 mm overlap length. DP460 epoxy was used as the adhesive material, and nano-Al2O3, nano-TiO2and nano-SiO2were used as the nanoparticles; and AISI 304 stainless steel plates were used as the adherents. Theresults of the experimental research revealed that average failure load increased significantly in nanoparticle-reinforced adhesive joints. The highest average failure load was obtained with 4 wt% nano-Al2O3in epoxyadhesive. Fatigue tests were performed at 10 Hz frequency, and 0.1 loading ratio (R). When the fatigue testresults were examined, it was observed that the addition of the nano-Al2O3and nano-SiO2to the adhesiveincreased fatigue strength of the adhesive joints, on the other hand, the addition of the nano-TiO2to the adhesivereduced fatigue strength of the adhesive joints.Öğe Experimental and numerical strength analysis of double lap joints subjected to tensile loads(Materials Testing, 2014) Adin, Hamit; Temiz, ŞemsettinIn this paper the mechanical behaviour of double lap joints (DLJs) bonded with adhesive was analyzed. The stress-strain behaviour was investigated along the overlap length and adherend thickness in DLJs subjected to tensile loads. The stress analyses were performed by finite element method (FEM). The FEM calculations were performed using ANSYS (12.0.1). Experimental results were compared with the FEM results and were found to be quite reasonable. The results show that the failure loads are increased with an increase in adherend thickness. The stress-strain behaviour changes depending on adherend thickness and overlap length. Both FEM stress analyses and experimental results revealed that failure occurred around the edge zones of the overlap length due to the effect of shear stresses, while the failure at the edges of the adhesive layer originated from the peel stress in tensile.
