Experimental Study on the Pull-Out Capacity of Blind Rivet Nuts (BRNs) Mounted on Cold-Formed Square Hollow Section Members with Different Wall Thickness

Öz

In this study, pull-out tests of blind rivet nuts (BRNs) mounted on cold-formed square hollow section (SHS) webs with 100×100 mm nominal cross-section dimensions and different wall thicknesses (2.0 to 5.0 mm) were performed, and the effect of different wall thicknesses and BRN thread sizes on the test results was experimentally investigated. M10 and M12 stainless steel BRNs were mounted on SHSs using a standard riveter tool, and the test elements were prepared for the experiment. Load–displacement curves and the final damage modes were obtained for each test specimen. The results show that the pull-out capacity depends on both the SHS wall thickness and rivet nut thread size. Although the pull-out capacity increased in both thread sizes with the increase in wall thickness parameters, the effect of thread size is negligible in the case of 2.5, 3.0, and 4.0 wall thickness. In addition, when a connection is created using a BRN, the design should consider the stripped thread strength in addition to the pull-out capacity.

Anahtar Kelimeler

• Blind rivet nut
• square hollow section
• pull-out capacity

Farklı Et Kalınlıklarına Sahip Soğuk Şekillendirilmiş Kare İçi Boş Kesitli Elemanlara Monte Edilen Kör Perçin Somunlarının (BRN'ler) Çekme Kapasitesi Üzerine Deneysel Çalışma

Öz

Bu çalışmada, 100x100 mm nominal kesit boyutlarına sahip farklı et kalınlıklarındaki (2.0 ile 5.0 mm) soğuk şekillendirilmiş kare içi boş profil (SHS) gövdelerine monte edilen kör perçin somunlarının (BRN'ler) çekme testleri gerçekleştirilmiş olup farklı duvar kalınlıklarının ve BRN diş boyutunun test sonuçlarına etkisi deneysel olarak araştırılmıştır. M10 ve M12 paslanmaz çelik BRN'ler standart perçinleme aleti kullanılarak SHS'lere monte edilmiş ve deney için test elemanları hazırlanmıştır. Her test numunesi için yük-yer değiştirme eğrileri ve nihai hasar modları elde edilmiştir. Sonuçlar, çekme kapasitesinin hem SHS duvar kalınlığına hem de perçin somunu diş boyutuna bağlı olduğunu göstermektedir. Her iki diş boyutunda da et kalınlığı parametrelerinin artmasıyla çekme kapasitesi artmasına rağmen, 2.5, 3.0 ve 4.0 et kalınlığı durumunda diş boyutunun etkisi ihmal edilebilir düzeydedir. Ayrıca, BRN kullanılarak bir bağlantı oluşturulduğunda, tasarımda çekme kapasitesinin yanı sıra BRN'lerin dişlerinin sıyrılma mukavemeti de dikkate alınmalıdır.

Anahtar Kelimeler

• Kör perçin somun
• kare içi boş kesit
• çekme kapasitesi

Kaynakça

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