Knockdown factors for cylindrical shells caused by torsional Mode-I type geometric imperfections under axial compression

İbrahim KOCABAŞ; Haluk YILMAZ

doi:https://doi.org/10.35860/iarej.891791

Makale detayları

Knockdown factors for cylindrical shells caused by torsional Mode-I type geometric imperfections under axial compression

Yazarlar:

İbrahim KOCABAŞ | Haluk YILMAZ

Yayıncı:

Ceyhun YILMAZ

Ana Başlıklar:

Diğer mühendislik dalları

Dergi:

International Advanced Researches and Engineering Journal 2021 Vol.5 Issue 3, pp.419-425

Belge Tipi:

Makale

Yayın Tarihi:

12/2021

Belge Dili:

İngilizce

Document ID (Org No.):

2000469227

Sıklık:

Üç Yıllık

eISSN:

2618-575X

DOI:

https://doi.org/10.35860/iarej.891791

Özet:

 

Geometrical imperfection, which is generally a result of manufacturing process and service conditions, plays a crucial role in load-bearing capacity of shell structures. This study presents a numerical study on knockdown factors of cylindrical shells as a result of torsional Mode-I type of geometric imperfections under compressive loads. The deformation patterns obtained from liner bifurcation analysis (LBA) for torsional Mode-I shape are used as a source of geometric imperfection. Then, geometrically nonlinear buckling analysis with imperfect model (GNIA) is incorporated with LBA in ANSYS Workbench to obtain limit loads of imperfect structures. A parametric study is thus performed to investigate the influence of imperfection depth on the load-bearing capacity considering a wide range of cylindrical shell configurations. Local and global buckling characteristics of the imperfect shells are examined and knockdown factors are characterized by three distinct regions as a basis of normalized imperfection depth. For a large number of shell configurations, a scattering of knockdown factors against normalized imperfection depth is given with mathematical expressions evolving lower and upper bounds. These expressions provide the minimum and maximum values of knockdown factors for a given imperfection depth, which can be treated as a design tool to ensure safety of the shell structure.

Makale detayları

Knockdown factors for cylindrical shells caused by torsional Mode-I type geometric imperfections under axial compression

Yazarlar: İbrahim KOCABAŞ | Haluk YILMAZ

Yayıncı: Ceyhun YILMAZ

Ana Başlıklar: Diğer mühendislik dalları

Dergi: International Advanced Researches and Engineering Journal 2021 Vol.5 Issue 3, pp.419-425

Belge Tipi: Makale

Yayın Tarihi: 12/2021

Belge Dili: İngilizce

Document ID (Org No.): 2000469227

Sıklık: Üç Yıllık

eISSN: 2618-575X

DOI: https://doi.org/10.35860/iarej.891791

Sayı

Yazarlar:

İbrahim KOCABAŞ | Haluk YILMAZ

Yayıncı:

Ceyhun YILMAZ

Ana Başlıklar:

Diğer mühendislik dalları

Dergi:

International Advanced Researches and Engineering Journal 2021 Vol.5 Issue 3, pp.419-425

Belge Tipi:

Makale

Yayın Tarihi:

12/2021

Belge Dili:

İngilizce

Document ID (Org No.):

2000469227

Sıklık:

Üç Yıllık

eISSN:

2618-575X

DOI:

https://doi.org/10.35860/iarej.891791