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Specimen clamping and performance of the Ioisipescu shear tests applied for composite materials
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2007 (English)In: 16th International Conference on Composite Materials, ICCM-16, 2007Conference paper (Refereed)
Abstract [en]

Clamping and subsequent loading in shear of Ioispescu specimens is investigated. Combined stresses reach similar, or even higher, levels locally compared the nominal shear stress, both compressive and tensile. Especially for brittle materials, composites, and materials with anisotropic failure modes, these stresses may cause premature failure outside the test region and appropriate clamping levels become important. A clamping ratio (r) between clamping force and peak shear force is introduced, and it is shown that for quasi-isotropic failure modes, the overall lowest detrimental stresses are obtained for about r ∼ 1. It is further shown that loss of contact always occurs in one part of the clamping region unless r is in excess of 2.5-3. Near that loss of contact, high tensile stresses are obtained. Even with moderate r, there will be local plasticity or crushing etc due to high contact pressure near the end of the opposing gripping face. These findings are shown both numerically and experimentally using optical full field strain measurements.

Place, publisher, year, edition, pages
Keyword [en]
Clamping, Composite, Experiment, Iosipescu, Numerical, Shear, Verification
National Category
Other Materials Engineering
URN: urn:nbn:se:kth:diva-154945ScopusID: 2-s2.0-79960060779ISBN: 978-493113605-2OAI: diva2:760023
16th International Conference on Composite Materials, ICCM-16 - "A Giant Step Towards Environmental Awareness: From Green Composites to Aerospace", 8 July 2007 through 13 July 2007, Kyoto, Japan

QC 20141103

Available from: 2014-11-03 Created: 2014-10-29 Last updated: 2014-11-03Bibliographically approved

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Neumeister, Jonas M.Melin, L. Niklas
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ReferencesLink to record
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