Otomotiv endüstrisinde kullanılan galvanizli çelik-alüminyum sac form punta bağlantılarının mekanik özelliklerinin araştırılması

Bu çalısma, form punta yöntemiyle ile olusturulan bağlantıların mekanik özelliklerinin incelenmesi amacıyla yapılmıstır. Form punta bağlantıları için özellikle otomotiv endüstrisinde kullanılan galvanizli(St1314) çelik ve alüminyum(Al5754) plakalar seçilmistir. Numunelere, sırasıyla TS EN ISO 14270 ve TS EN ISO 14273 standardına uygun olarak kesme deneyi ve mekanize soyma deneyleri uygulanmıstır. Keza farklı yerlesim sırası ve farklı plaka kalınlıklarının etkilerini incelemek için mikroskobik analizler de uygulanmıstır. Üstte galvanizli çelik altta alüminyum levhadan olusan kombinasyonun dayanımı tam tersi kombinasyondan yaklasık iki kat daha büyüktür. Büyük değerdeki plaka kalınlığı oranlarının, kırılma ve ayrılmalara neden olduğu gözlemlenmistir.

The investigation of the mechanical properties of galvanized steel-aluminum sheets joints used in automotive industry formed by mechanical clinching

In this study, mechanical properties of the joints which made with the mechanic clinching were investigated. Galvanized steel (St1314) which is used especially in automotive industry and aluminum (Al5754) sheets were selected in clinching joints. Shear and mechanized peel tests were carried out according to TS EN ISO 14273 and TS EN ISO 14270 respectively. Microscopic analyses were also examined to investigate the effect of sheet thickness and sheet place order. The strength for the combination of the upper steel sheet of and the lower aluminum sheet of is approximately two times larger than that of the reverse place order. The fracture and separation were observed in bigger values of sheet thickness ratio.

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