On the accuracy of continuous and discontinuous boundary elements

1988 ◽  
Vol 5 (4) ◽  
pp. 205-211 ◽  
Author(s):  
P. Parreira
Keyword(s):  
Boundary Elements ◽  
Discontinuous Boundary

Crack Analysis using Discontinuous Boundary Elements

1993 ◽  
Vol 207 (1) ◽  
pp. 41-45 ◽  
Author(s):  
A Elzein ◽  
R A Adey
Keyword(s):  
Aerospace Industry ◽  
Three Dimensional ◽  
Boundary Elements ◽  
Intensity Factors ◽  
Convergence Results ◽  
Discontinuous Boundary ◽  
Crack Problems ◽  
Axisymmetric Problems ◽  
Analysis System ◽  
Line Elements

A simple and efficient approach is proposed for the analysis of crack problems occurring in mechanical components widely used in the aerospace industry. A linear stress analysis of the cracked components is performed using discontinuous boundary elements at the crack tip. The engineering analysis system BEASY is used to derive accurate predictions of the stress intensity factors corresponding to either of the three modes KI, KII or KIII. With the proposed approach, the user has to model only the surface of the component, as opposed to its volume in finite elements. Thus, line elements in two-dimensional and axisymmetric problems and surface quadrilaterals or triangles in three-dimensional problems are used to mesh the components. The approach clearly results in substantial savings in mesh preparation effort. The paper will describe the application of the system to problems in the aerospace field and the convergence results that demonstrate the high accuracy and reliability of the technique.

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