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| Fatigue crack propagation analysis of tubular K-joints II: numerical |
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| DOI：10.7511/jslx20076140 |
| KeyWord:tubular K-joints,stress intensity factors(SIFs),mesh generation,J-integral,displacement extrapolation method |
| QU Shu-ying*1 SHAO Yong-bo1 ZHANG Bao-feng1 YANG Chun-qiu2 |
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| Abstract: |
| The prediction of the damaged tubular K-joints depends very much on the accuracy of the stress intensity factors(SIFs).No parametric equations and very few results have been proposed and published in the literature for estimating the SIFs of any K-joints subjected under complex loading conditions.In this paper,a mesh generation method has been proposed for a typical K-joint containing a surface crack.This method is realized by dividing the K-joint into several sub-zones with each zone consisting of different types of elements and mesh densities.This method has a distinct advantage of controlling the mesh quality,and most importantly the aspect ratio of the elements along the crack front.When the mesh of all the sub-zones has been generated automatically and completely,they are merged to form the complete model.Two most commonly used methods,namely Jintegral and displacement extrapolation,are used to evaluate the SIF values along the crack front of a typical K-joint.To validate the accuracy of these computed SIFs,the experimental SIFs obtained in Part I were used to benchmark the numerical results.The experimental SIFs are found to be in complete agreement with the computed SIFs obtained from the generated models.Hence,the proposed finite element models are both efficient and reliable. |
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