Ağır ve hafif kaynak işlemlerinin kare kesitli boş profillerin burkulma davranışı üzerindeki etkilerinin incelenmesi: Parametrik bir çalışma

Öz

Bu parametrik çalışma, eksenel basınç ve ana eksen eğilmesi altında, kaynaklı köşelere sahip kare kesitli boş profillerin (SHS) yerel elastik burkulma davranışı üzerindeki hafif ve ağır kaynak işleminden kaynaklanan artık gerilmelerin etkisini incelemektedir. Sabit bir yükseklik-et kalınlığı oranı (40) ile çeşitli SHS boyutlarının analizi yoluyla, artık gerilme seviyelerinin yük taşıma kapasitesi üzerindeki etkileri hakkında önemli bulgular sunulmaktadır. Bulgular, ağır kaynak işlemiyle oluşan artık gerilmelerin kritik burkulma yüklerini her iki yükleme durumunda da belirgin bir şekilde azalttığını ortaya koymaktadır. Özellikle, eksenel basınç altında ağır kaynak, yaklaşık %15.3 oranında çatallanma yüklerinde önemli bir azalmaya yol açarken, hafif kaynak ise yaklaşık %7.5 oranında bir azalma sağlamıştır. Ana eksen eğilmesi durumunda da benzer şekilde önemli etkiler gözlemlenmiş olup, çatallanma momentleri ağır kaynak için yaklaşık %12.78, hafif kaynak için ise %6.16 oranında azalmıştır. Bulgular, özellikle ağır kaynaktan kaynaklanan artık gerilmenin eksenel basınç üzerindeki önemli etkisini vurgulamakta ve SHS'lerin bu yükleme koşuluna, ana eksen eğilmesine kıyasla daha hassas olduğunu göstermektedir. Bu çalışma, yapısal güvenilirliği sağlamak için tasarım uygulamalarında kaynak türünün dikkatlice değerlendirilmesi gerektiğini vurgulamaktadır.

Anahtar Kelimeler

• Kare Kesitli Boş Profiller (SHS)
• Yerel Elastik Burkulma
• Artık Gerilme
• Ağır ve Hafif Kaynak
• Sonlu Elemanlar Analizi

Investigation of the effects of heavy and light welding on buckling behavior of square hollow sections: Parametric study

Abstract

This parametric study examines the influence of residual stresses from light and heavy welding on the local elastic buckling behavior of square hollow sections (SHSs) with welded corners, under axial compression and major axis bending. By analyzing various SHS sizes with a constant height-to-thickness ratio of 40, this investigation provides insights into how residual stress levels impact load-bearing capacity. Findings reveal a pronounced impact of heavy welding-induced residual stresses, notably diminishing the critical buckling loads across both loading conditions. Specifically, under axial compression, heavy welding led to a significant reduction in bifurcation loads by approximately 15.3%, while light welding caused a reduction of around 7.5%. In major axis bending, the effects were similarly considerable, with bifurcation moments reduced by approximately 12.78% for heavy welding and by 6.16% for light welding. The findings underscore the substantial effect of residual stress, particularly from heavy welding, on axial compression, indicating a greater sensitivity of SHSs to this loading condition relative to major axis bending. This study emphasizes the need for careful consideration of welding type in design practices to ensure structural reliability.

Keywords

• Square Hollow Sections (SHS)
• Local Elastic Buckling Residual Stress
• Heavy and Light Welding
• Finite Element Analysis

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