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A tensile setup for the IDNS composite shear test
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2006 (English)In: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840, Vol. 37, no 2, 229-242 p.Article in journal (Refereed) Published
Abstract [en]

An existing test method, the inclined double notch shear (IDNS-) test, for determination of interlaminar shear properties in thin panels of layered composite materials was developed further. Experimentally observed and unresolved issues with the original IDNS-test setup were addressed. Undesired specimen deformation (and potential instability) is observed at high loads with the original compressive setup, particularly for more compliant materials. Then, testing conditions continuously change throughout a test. Here, a tensile setup which applied a statically determined combination of loads to the doubly notched specimen was used instead. The proper combination of loads minimized the arising stress concentrations at the notch roots while it produced a homogeneous state of true inter-laminar shear stress over the test region. Numerical (FE-) analyses and experimental studies to investigate testing conditions such as: specimen geometry parameters, appropriate loading combinations, and recommendations for optimal test performance in terms of achieved shear strengths and shear strain fields, were performed. In addition to the tensile setup, the possibility to use tilted notches was studied. The tensile IDNS-setup produced more homogeneous fields over the test region, even for short notch distances, further it achieved interlaminar shear strength values in the same range as or even higher than the original setup. Finally, distinctly less specimen deformation was observed with the tensile setup, and thus proper adjustment was much simpler while instability was completely avoided.

Place, publisher, year, edition, pages
2006. Vol. 37, no 2, 229-242 p.
Keyword [en]
iosipescu specimen, elasticity analysis, concentrated loads, orthotropic beams, 3-point
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-25195DOI: 10.1016/j.compositesa.2005.08.018ISI: 000235931100010Scopus ID: 2-s2.0-32344432285OAI: oai:DiVA.org:kth-25195DiVA: diva2:356402
Conference
2nd International Conference on Composites Testing and Model Identification (CompTest 200) Univ Bristol, Bristol, ENGLAND, SEP 21-23, 2004
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
Opponent
Supervisors
Note

QC 20101012

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

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