Assessment of the Hodograph Cone Method (HCM) for the Evaluation of the COD of Off-Centered Crack in Pipes Under Bending for LBB Assessment

2010 ◽  
Author(s):  
G. Iannitti
Keyword(s):  
Finite Element Analysis ◽  
Experimental Investigation ◽  
Finite Element ◽  
Numerical Model ◽  
Crack Length ◽  
Direct Imaging ◽  
Element Analysis ◽  
Fem Model ◽  
Large Crack

In this work the applicability and the accuracy of the hodograph cone method (HCM) for estimating the COD distribution of off-centered cracks in pipe under bending has been verified by means of extensive finite element analysis and experimental investigation. The need to develop appropriated numerical model and the guideline to follows in order to get accurate results is discussed. Experimental measures performed by means of direct imaging correlation confirmed both the accuracy of the FEM model adopted as well as the robustness of the HCM. A correction for further improvement of the HCM accuracy and extension to large crack length is also proposed.

Finite Element Analysis on Mechanic Behavior of Joints between Elevated Columns and Truss Columns in Substation Frame

2012 ◽  
Vol 256-259 ◽  
pp. 949-953
Author(s):  
An Liang Song ◽  
Hong Dong Ran ◽  
Ming Zhou Su ◽  
Zhen Shan Wang ◽  
Yun Shi
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Design Principle ◽  
Element Analysis ◽  
Fem Model ◽  
Gusset Plate ◽  
Elastic Plastic ◽  
Whole Process ◽  
Prototype Structure ◽  
Plastic Stage

Finite element analysis have been carried out in order to study the mechanical properties of the joints between elevated columns and truss column in substation frame. Firstly, the numerical results and the experimental ones were compared to verify the efficiency of the FEM model. Then, the whole process of elastic-plastic analysis was carried out to the prototype structure. The results show that when the bottom of the elevated column was yielding, the stress of the stiffeners at the joint is small, which can meet the design principle of “strong joint - weak member” criterion. Furthermore, when the structure enters into the elastic-plastic stage, the stress in the upper stiffeners at the horizontal load direction is large and most of them yield, but the stress in the plane gusset plate of the joint is still small.

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