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The modified iosipescu shear test for measuring strengths and constitutive behavior of composites
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2006. , 6 p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 0425
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-4249OAI: oai:DiVA.org:kth-4249DiVA: diva2:11447
Presentation
2006-12-15, Sal F3, KTH, Osquars backe 14, Stockholm, 10:15
Opponent
Supervisors
Note

QC 20101119

Available from: 2006-12-20 Created: 2006-12-20 Last updated: 2013-01-15Bibliographically approved
List of papers
1. A modified Iosipescu Test for Anisotropic Composite Panels
Open this publication in new window or tab >>A modified Iosipescu Test for Anisotropic Composite Panels
2004 (English)In: 14th Internatonal Conference on Composite Materials, ICCM-14: San Diego, CA: 14 July 2003 through 18 July 2003, 2004, 121-129 p.Conference paper, Published paper (Refereed)
Abstract [en]

The Iosipescu (V-notched beam) shear test for in-plane shear properties of composite panels was modified with respect to specimen geometry. The ASTM standard prescribes V notches with 90° opening angle, while the resulting stress field in the test region strongly depends on the material anisotropy. Thus, the test performance depends on actual material properties and material orientation relative to the test region. A variable notch opening angle was proposed to accomodate both material anisotropy and orientation.

Keyword
Composite Panels, Iosipescu Shear Test, Anisotropy
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-9232 (URN)2-s2.0-7044284821 (Scopus ID)
Note
QC 20100827. Tidigare titel: A Modified Iosipescu Shear Test for Anisotropic Composite PanelsAvailable from: 2008-10-10 Created: 2008-10-10 Last updated: 2010-11-19Bibliographically approved
2. Measuring constitutive shear behavior of orthotropic composites and evaluation of the modified Iosipescu test
Open this publication in new window or tab >>Measuring constitutive shear behavior of orthotropic composites and evaluation of the modified Iosipescu test
2006 (English)In: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 76, no 1-2, 106-115 p.Article in journal (Refereed) Published
Abstract [en]

The modified Iosipescu test uses a variable notch opening angle 0, depending on the material anisotropy and orientation, to accomplish even stress- and strain-fields in the test region. Constitutive shear properties can thus be measured more accurately, more completely, and with fewer sources of error. Here more materials and properties were studied, and a 3D optical strain- and displacement-monitoring system was used to evaluate and improve both the modified test and the novel fixture used here. It performed substantially better than the commonly used Wyoming fixture in terms of producing constant through specimen thickness conditions and preventing undesired specimen twisting. Additionally, loading-unloading behavior of two high-performance, essentially unidirectional, fiber composites was investigated to assess stiffness reduction, damage, localization, and irreversible strains. In the present of such, well controlled testing conditions are even more important.

Keyword
shear properties, modified Iosipescu test, anisotropy, strain field uniformity, fixtures comparison and evaluation, optical 3D monitoring of strains and desired/undesired displacements
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-9223 (URN)10.1016/j.compstruct.2006.06.016 (DOI)000241777000016 ()2-s2.0-33747356043 (Scopus ID)
Note
QC 20100827. Conference: 15th International Conference on Composite Materials (ICCM-15). Durban, SOUTH AFRICA. JUN 27-JUL 01, 2005Available from: 2008-10-10 Created: 2008-10-10 Last updated: 2017-12-11Bibliographically approved
3. The influence of specimen clamping and specimen imperfections on the losipescu shear test performance
Open this publication in new window or tab >>The influence of specimen clamping and specimen imperfections on the losipescu shear test performance
2006 (English)Article in journal (Other academic) Submitted
Keyword
shear test, modified Iosipescu, composite, imperfection sensitivity, clamping
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-9224 (URN)
Note
QS 20120316. Tidigare titel: The Influence of Specimen Imperfection and Fasterning on Test Performance for the Modified Iosipescu Shear TestAvailable from: 2008-10-10 Created: 2008-10-10 Last updated: 2012-03-16Bibliographically approved

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