Abstract
In this paper, an improved cohesive element is proposed for accurate quantification of delamination in laminar composites. The improved cohesive element employs a mixed Gaussian and sub-domain integration scheme for cohesive stress integration. Level set description of crack front geometry is used to accurately track the evolving delamination crack front. The new element offers significant improvement in solution accuracy and numerical stability, as compared with conventional cohesive elements using either Gaussian integration or Newton-Cotes integration. The much enhanced numerical accuracy and stability permit the use of bonded structural element size as large as 1 ~ 1.5 times the cohesive zone size without significantly compromising numerical accuracy and efficiency. This greatly alleviates the strict mesh size requirement imposed by conventional cohesive elements that require the bonded structural element size be smaller than 1/3 ~ 1/5 of the cohesive zone size. Furthermore, the new element offers the benefit of easy insertion of arbitrary initial crack geometry for a structured mesh.
| Original language | English |
|---|---|
| Pages (from-to) | 611-641 |
| Number of pages | 31 |
| Journal | International Journal for Numerical Methods in Engineering |
| Volume | 83 |
| Issue number | 5 |
| DOIs | |
| State | Published - Jul 30 2010 |
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Keywords
- Cohesive zone model
- Composite
- Delamination
- Fracture
- Level set method
- Shell
ASJC Scopus subject areas
- Engineering(all)
- Applied Mathematics
- Numerical Analysis
Cite this
An improved cohesive element for shell delamination analyses. / Yang, Qingda; Fang, X. J.; Shi, J. X.; Lua, J.
In: International Journal for Numerical Methods in Engineering, Vol. 83, No. 5, 30.07.2010, p. 611-641.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - An improved cohesive element for shell delamination analyses
AU - Yang, Qingda
AU - Fang, X. J.
AU - Shi, J. X.
AU - Lua, J.
PY - 2010/7/30
Y1 - 2010/7/30
N2 - In this paper, an improved cohesive element is proposed for accurate quantification of delamination in laminar composites. The improved cohesive element employs a mixed Gaussian and sub-domain integration scheme for cohesive stress integration. Level set description of crack front geometry is used to accurately track the evolving delamination crack front. The new element offers significant improvement in solution accuracy and numerical stability, as compared with conventional cohesive elements using either Gaussian integration or Newton-Cotes integration. The much enhanced numerical accuracy and stability permit the use of bonded structural element size as large as 1 ~ 1.5 times the cohesive zone size without significantly compromising numerical accuracy and efficiency. This greatly alleviates the strict mesh size requirement imposed by conventional cohesive elements that require the bonded structural element size be smaller than 1/3 ~ 1/5 of the cohesive zone size. Furthermore, the new element offers the benefit of easy insertion of arbitrary initial crack geometry for a structured mesh.
AB - In this paper, an improved cohesive element is proposed for accurate quantification of delamination in laminar composites. The improved cohesive element employs a mixed Gaussian and sub-domain integration scheme for cohesive stress integration. Level set description of crack front geometry is used to accurately track the evolving delamination crack front. The new element offers significant improvement in solution accuracy and numerical stability, as compared with conventional cohesive elements using either Gaussian integration or Newton-Cotes integration. The much enhanced numerical accuracy and stability permit the use of bonded structural element size as large as 1 ~ 1.5 times the cohesive zone size without significantly compromising numerical accuracy and efficiency. This greatly alleviates the strict mesh size requirement imposed by conventional cohesive elements that require the bonded structural element size be smaller than 1/3 ~ 1/5 of the cohesive zone size. Furthermore, the new element offers the benefit of easy insertion of arbitrary initial crack geometry for a structured mesh.
KW - Cohesive zone model
KW - Composite
KW - Delamination
KW - Fracture
KW - Level set method
KW - Shell
UR - http://www.scopus.com/inward/record.url?scp=77954624546&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77954624546&partnerID=8YFLogxK
U2 - 10.1002/nme.2848
DO - 10.1002/nme.2848
M3 - Article
AN - SCOPUS:77954624546
VL - 83
SP - 611
EP - 641
JO - International Journal for Numerical Methods in Engineering
JF - International Journal for Numerical Methods in Engineering
SN - 0029-5981
IS - 5
ER -