scholarly journals Three-Dimensional Finite Element Model for Evaluation the Stress Intensity Factors for Different Fracture Modes of Homogeneous Bimaterial

2007 ◽  
Vol 18 (1) ◽  
pp. 73-87
Author(s):  
H. Hedia ◽  
S. Aldousari
Keyword(s):  
Finite Element ◽  
Stress Intensity ◽  
Finite Element Model ◽  
Stress Intensity Factors ◽  
Three Dimensional ◽  
Element Model ◽  
Intensity Factors ◽  
Fracture Modes ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Bolted Joint Fracture Analysis Study Using Modern Methods

2012 ◽  
Author(s):  
David Griffin ◽  
Gary Reed ◽  
Andrew Mills ◽  
Russell Brayshaw
Keyword(s):  
Finite Element ◽  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Three Dimensional ◽  
Pressure Vessels ◽  
Intensity Factors ◽  
Extended Defect ◽  
Joint Fracture ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

This paper describes the outcome of a fracture study to ascertain the benefits of using modern three dimensional finite element techniques. The defects considered are postulated to be present at the root of a threaded fastener. The defects are explicitly modelled using three dimensional finite element analysis to extract the relevant fracture parameters. A large number of thumbnail defects of varying size and aspect ratio have been incorporated into the root of the first engaged thread of studs typically used in pressure vessels. Stress intensity factors at the defect surface and depth locations have been extracted for a number of thermal transient events using a domain integration technique within the general finite element code ANSYS. The above stress intensity factors were then used to generate fracture calculations using an R6 based procedure [1] for: • Toughness-based fracture margins for each defect modelled; • Critical defect size; • Comparisons with a fully extended defect.

scholarly journals MODELLING FROM THE PAST: THE LEANING SOUTWEST TOWER OF CAERPHILLY CASTLE 1539-2015

2017 ◽  
Vol IV-2/W2 ◽  
pp. 221-227 ◽  
Author(s):  
O. E. C. Prizeman ◽  
V. Sarhosis ◽  
A. M. D’Alri ◽  
C. J. Whitman ◽  
G. Muratore
Keyword(s):  
Finite Element ◽  
Structural Analysis ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Element Model ◽  
Present Condition ◽  
Long Term Stability ◽  
Dimensional Finite Element ◽  
The Uk ◽  
Three Dimensional Finite Element

Caerphilly Castle (1268-70) is the first concentric castle in Britain and the second largest in the UK. The dramatic inclination of its ruinous south west tower has been noted since 1539. Comparing data from historical surveys and a terrestrial laser scan undertaken in 2015, this paper seeks to review evidence for the long-term stability of the tower. Digital documentation and archival research by architects is collated to provide data for structural analysis by engineers. A terrestrial laser scan was used to create a detailed three dimensional finite element model to enable structural analysis of the current shape of the tower made by tetrahedral elements. An automated strategy has been implemented for the transformation of the complex three dimensional point cloud into a three dimensional finite element model. Numerical analysis has been carried out aiming at understanding the main structural weaknesses of the tower in its present condition. Comparisons of four sets of data: 1539, 1830, 1870 and 2015 enabled us to determine change albeit between very different methods of measurement.

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