Location Results for Brace Spacing in Gap Tubular “K” Joints Using FEM

• 作者: P. N. Jiki
• 来源期刊: 现代机械工程(英文)
• 学科: 医学
• 关键词: TUBULAR Joint Finite Element Computer Simulation Structural JOINTS Effect of BRACING STRESS Concentration STRESS Distribution
• 年，卷（期）: 2013,（1）
• 页码范围: 50-54
• 页数: 5页
• 分类号: R73

摘要

The 8-node iso-parametric thin shell element was employed in the study of stress concentrations in the welded tubular “K” joint. Element equilibrium equations were derived using isoparametric formulation based on thin shell theory. After assembly, the resulting system equations were solved using existing fortran programs. Numerical experiments were conducted to isolate and locate ideal gap (positions) for the two braces of the “K” joint. The nominal stresses were calculated from which stress concentration factors were obtained. The resulting stress concentration factors were presented both as tables and as figures. A good agreement between our solutions and those for model joints in the literature is good and acceptable. It was found that the wider apart the brace spacing is, the weaker the strength of the joint. It was also found that the best location for the braces occurs when the stress level changes sign either from positive to negative or vice versa at a critical sampling point.