Measuring Cohesive Laws for Interfaces in Sandwich Structures

Christian Lundsgaard-Larsen; Bent F. Sørensen; Carl Christian Berggreen; Rasmus Christian Østergaard

Measuring Cohesive Laws for Interfaces in Sandwich Structures

Christian Lundsgaard-Larsen
, Bent F. Sørensen
, Carl Christian Berggreen
, Rasmus Christian Østergaard

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

Abstract

Extraction of cohesive laws are conducted for interfaces in sandwich structures. Separation between face and core are driven by pure bending moments applied to double cantilever beam (DCB) specimens. By varying the ratio between moments applied to the beams the test is conducted for different mode mixities. The sandwich specimens consists of glass fiber faces and Divinycell H200 foam core with a pre-crack between face and core made with teflon film. Arbitrary stiffening of the sandwich faces with steel bars adhered to the faces reduces rotations and ensures that the method is useable for a wide range of materials. The J integral is employed in closed form and the opening of the pre-crack tip is recorded by a commercial optical measurement system. Cohesive laws are extracted by differentiating J with respect to the normal and tangential opening of the pre-crack tip. Results for one specimen are presented and discussed.

Original language	English
Title of host publication	Polymer Composite Materials for Wind Power Turbines
Editors	H. Lilholt, B. Madsen, T.L. Andersen, L.P. Mikkelsen, A. Thygesen
Number of pages	375
Place of Publication	Roskilde, Denmark
Publisher	Risø National Laboratory
Publication date	2006
Pages	223-230
ISBN (Print)	87-550-3528-0
Publication status	Published - 2006
Event	27th Risoe International Symposium on Materials Science - Risø, Denmark Duration: 4 Sept 2006 → 7 Sept 2006

Conference

Conference	27th Risoe International Symposium on Materials Science
Country/Territory	Denmark
City	Risø
Period	04/09/2006 → 07/09/2006

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Lundsgaard-Larsen, C., Sørensen, B. F., Berggreen, C. C., & Østergaard, R. C. (2006). Measuring Cohesive Laws for Interfaces in Sandwich Structures. In H. Lilholt, B. Madsen, T. L. Andersen, L. P. Mikkelsen, & A. Thygesen (Eds.), Polymer Composite Materials for Wind Power Turbines (pp. 223-230). Risø National Laboratory. http://www.risoe.dtu.dk/rispubl/art/2006_48_paper.pdf

@inproceedings{12709d89232c4a4ba770411c05b4ebae,

title = "Measuring Cohesive Laws for Interfaces in Sandwich Structures",

abstract = "Extraction of cohesive laws are conducted for interfaces in sandwich structures. Separation between face and core are driven by pure bending moments applied to double cantilever beam (DCB) specimens. By varying the ratio between moments applied to the beams the test is conducted for different mode mixities. The sandwich specimens consists of glass fiber faces and Divinycell H200 foam core with a pre-crack between face and core made with teflon film. Arbitrary stiffening of the sandwich faces with steel bars adhered to the faces reduces rotations and ensures that the method is useable for a wide range of materials. The J integral is employed in closed form and the opening of the pre-crack tip is recorded by a commercial optical measurement system. Cohesive laws are extracted by differentiating J with respect to the normal and tangential opening of the pre-crack tip. Results for one specimen are presented and discussed.",

keywords = "Vindenergi",

author = "Christian Lundsgaard-Larsen and S{\o}rensen, \{Bent F.\} and Berggreen, \{Carl Christian\} and {\O}stergaard, \{Rasmus Christian\}",

year = "2006",

language = "English",

isbn = "87-550-3528-0",

pages = "223--230",

editor = "H. Lilholt and B. Madsen and T.L. Andersen and L.P. Mikkelsen and A. Thygesen",

booktitle = "Polymer Composite Materials for Wind Power Turbines",

publisher = "Ris{\o} National Laboratory",

note = "27th Risoe International Symposium on Materials Science ; Conference date: 04-09-2006 Through 07-09-2006",

}

Lundsgaard-Larsen, C, Sørensen, BF , Berggreen, CC & Østergaard, RC 2006, Measuring Cohesive Laws for Interfaces in Sandwich Structures. in H Lilholt, B Madsen, TL Andersen, LP Mikkelsen & A Thygesen (eds), Polymer Composite Materials for Wind Power Turbines. Risø National Laboratory, Roskilde, Denmark, pp. 223-230, 27th Risoe International Symposium on Materials Science, Risø, Denmark, 04/09/2006. <http://www.risoe.dtu.dk/rispubl/art/2006_48_paper.pdf>

Measuring Cohesive Laws for Interfaces in Sandwich Structures. / Lundsgaard-Larsen, Christian; Sørensen, Bent F.; Berggreen, Carl Christian et al.
Polymer Composite Materials for Wind Power Turbines. ed. / H. Lilholt; B. Madsen; T.L. Andersen; L.P. Mikkelsen; A. Thygesen. Roskilde, Denmark: Risø National Laboratory, 2006. p. 223-230.

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

TY - GEN

T1 - Measuring Cohesive Laws for Interfaces in Sandwich Structures

AU - Lundsgaard-Larsen, Christian

AU - Sørensen, Bent F.

AU - Berggreen, Carl Christian

AU - Østergaard, Rasmus Christian

PY - 2006

Y1 - 2006

N2 - Extraction of cohesive laws are conducted for interfaces in sandwich structures. Separation between face and core are driven by pure bending moments applied to double cantilever beam (DCB) specimens. By varying the ratio between moments applied to the beams the test is conducted for different mode mixities. The sandwich specimens consists of glass fiber faces and Divinycell H200 foam core with a pre-crack between face and core made with teflon film. Arbitrary stiffening of the sandwich faces with steel bars adhered to the faces reduces rotations and ensures that the method is useable for a wide range of materials. The J integral is employed in closed form and the opening of the pre-crack tip is recorded by a commercial optical measurement system. Cohesive laws are extracted by differentiating J with respect to the normal and tangential opening of the pre-crack tip. Results for one specimen are presented and discussed.

AB - Extraction of cohesive laws are conducted for interfaces in sandwich structures. Separation between face and core are driven by pure bending moments applied to double cantilever beam (DCB) specimens. By varying the ratio between moments applied to the beams the test is conducted for different mode mixities. The sandwich specimens consists of glass fiber faces and Divinycell H200 foam core with a pre-crack between face and core made with teflon film. Arbitrary stiffening of the sandwich faces with steel bars adhered to the faces reduces rotations and ensures that the method is useable for a wide range of materials. The J integral is employed in closed form and the opening of the pre-crack tip is recorded by a commercial optical measurement system. Cohesive laws are extracted by differentiating J with respect to the normal and tangential opening of the pre-crack tip. Results for one specimen are presented and discussed.

KW - Vindenergi

M3 - Article in proceedings

SN - 87-550-3528-0

SP - 223

EP - 230

BT - Polymer Composite Materials for Wind Power Turbines

A2 - Lilholt, H.

A2 - Madsen, B.

A2 - Andersen, T.L.

A2 - Mikkelsen, L.P.

A2 - Thygesen, A.

PB - Risø National Laboratory

CY - Roskilde, Denmark

T2 - 27th Risoe International Symposium on Materials Science

Y2 - 4 September 2006 through 7 September 2006

ER -

Measuring Cohesive Laws for Interfaces in Sandwich Structures

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