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Evaluation of four composite shear test methods by digital speckle strain mapping and fractographic analysis
KTH, Superseded Departments, Solid Mechanics.
KTH, Superseded Departments, Solid Mechanics.
KTH, Superseded Departments, Solid Mechanics.
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2000 (English)In: Journal of composites technology & research, ISSN 0884-6804, E-ISSN 1945-7537, Vol. 22, no 3, 161-172 p.Article in journal (Refereed) Published
Abstract [en]

Four methods to determine composite interlaminar shear strength (ILSS) are evaluated. In particular, the recently devised inclined double-notch shear test (IDNS) is compared with three existing and more established methods: the Iosipescu test, the short three-point bending test (S3PB) and the double-notch compression test (DNC). The uniformity of strain field in the test region in a real test situation-which is the crucial test method quality parameter-is investigated by strain mapping using digital speckle photography. The measured strain fields are compared with FE-calculated strains representing ideal conditions and both known advantages and drawbacks of the different methods are confirmed. The IDNS test produces the most uniform strain fields and also consistently high ILSS values. A fractographic analysis indicates shear separation over a major part of the fracture surfaces of all specimen types; typical shear cusps were found over about 80% of the IDNS fracture surface and in about 50% to 70% in the other specimens. For the Iosipescu tests, failure initiation could be ascribed to initiation in tension at defects. Experimentally determined stress-strain responses in shear exhibit a distinct variation among the different methods. For the best methods, a notable material softening was observed Drier to failure. Observed formation of shear cusps is believed to be the primary cause for this softening of the composite material studied here.

Place, publisher, year, edition, pages
2000. Vol. 22, no 3, 161-172 p.
Keyword [en]
composite, shear test, Iosipescu, short beam, double notch, inclined, experiment, comparison, evaluation, fractography, strain mapping
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-25199ISI: 000088320100005OAI: oai:DiVA.org:kth-25199DiVA: diva2:356418
Note
QC 20101012Available from: 2010-10-12 Created: 2010-10-12 Last updated: 2017-12-12Bibliographically approved
In thesis
1. The inclined double notch shear test for determination of interlaminar shear properties of composite laminates
Open this publication in new window or tab >>The inclined double notch shear test for determination of interlaminar shear properties of composite laminates
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2005. 23 p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid mechanics, ISSN 1654-1472 ; 0369
Keyword
compisite, laminate, interlaminar, shear, test method, experimental comparison, strength
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-557 (URN)
Public defence
2005-12-19, Sal D2, Lindstedtsvägen 3, Stockholm, 10:00
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Note

QC 20101012

Available from: 2005-12-14 Created: 2005-12-14 Last updated: 2013-01-14Bibliographically approved

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