Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 559-576 |
| Seitenumfang | 18 |
| Fachzeitschrift | Computer Methods in Applied Mechanics and Engineering |
| Jahrgang | 340 |
| Frühes Online-Datum | 2 Juni 2018 |
| Publikationsstatus | Veröffentlicht - 1 Okt. 2018 |
Abstract
For integrals with various orders of vertex singularity encountered in the generalized/extended finite element method, three difficulties should be concerned as: (a) the singularity with respect to local distance r; (b) the near singularity caused by ill-shaped patches; (c) the near singularity during the iso-parametric transformation. In this paper, based on the Duffy transformation, the near singularities caused by ill-shaped patches and element shape distortion are revealed theoretically and numerically, a Duffy-distance transformation is constructed to damp out the near singularity caused by ill-shaped patches, and a conformal preconditioning strategy is developed to fully eliminate the near singularity caused by element shape distortion. Extensive numerical examples, including crack-tip elements with distorted shape, are given to validate the efficiency and robustness of the presented scheme in this paper.
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in: Computer Methods in Applied Mechanics and Engineering, Jahrgang 340, 01.10.2018, S. 559-576.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Efficient integration of crack singularities in the extended finite element method
T2 - Duffy-distance transformation and conformal preconditioning strategy
AU - Lv, Jia He
AU - Jiao, Yu Yong
AU - Wriggers, Peter
AU - Rabczuk, Timon
AU - Feng, Xia Ting
AU - Tan, Fei
PY - 2018/10/1
Y1 - 2018/10/1
N2 - For integrals with various orders of vertex singularity encountered in the generalized/extended finite element method, three difficulties should be concerned as: (a) the singularity with respect to local distance r; (b) the near singularity caused by ill-shaped patches; (c) the near singularity during the iso-parametric transformation. In this paper, based on the Duffy transformation, the near singularities caused by ill-shaped patches and element shape distortion are revealed theoretically and numerically, a Duffy-distance transformation is constructed to damp out the near singularity caused by ill-shaped patches, and a conformal preconditioning strategy is developed to fully eliminate the near singularity caused by element shape distortion. Extensive numerical examples, including crack-tip elements with distorted shape, are given to validate the efficiency and robustness of the presented scheme in this paper.
AB - For integrals with various orders of vertex singularity encountered in the generalized/extended finite element method, three difficulties should be concerned as: (a) the singularity with respect to local distance r; (b) the near singularity caused by ill-shaped patches; (c) the near singularity during the iso-parametric transformation. In this paper, based on the Duffy transformation, the near singularities caused by ill-shaped patches and element shape distortion are revealed theoretically and numerically, a Duffy-distance transformation is constructed to damp out the near singularity caused by ill-shaped patches, and a conformal preconditioning strategy is developed to fully eliminate the near singularity caused by element shape distortion. Extensive numerical examples, including crack-tip elements with distorted shape, are given to validate the efficiency and robustness of the presented scheme in this paper.
KW - Conformal preconditioning
KW - Duffy transformation
KW - Numerical quadrature
KW - Weak singularity
KW - XFEM
UR - http://www.scopus.com/inward/record.url?scp=85049085032&partnerID=8YFLogxK
U2 - 10.1016/j.cma.2018.05.028
DO - 10.1016/j.cma.2018.05.028
M3 - Article
AN - SCOPUS:85049085032
VL - 340
SP - 559
EP - 576
JO - Computer Methods in Applied Mechanics and Engineering
JF - Computer Methods in Applied Mechanics and Engineering
SN - 0045-7825
ER -