Stresses and Strains in Cruciform Samples Deformed in Tension

The stress and strain relationship in the gauge region of six cruciform geometries is studied: the ISO standard geometry with slits in arms, two geometries with thinned gauge areas, two geometries with thinned gauge areas and slits in arms, and one modified ISO standard geometry with slits in arms a...

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Bibliographic Details
Published in:Experimental mechanics 2017, Vol.57 (6), p.905-920
Main Authors: Upadhyay, M. V., Panzner, T., Van Petegem, S., Van Swygenhoven, H.
Format: Article
Language:English
Subjects:
Biaxial loads
Biomedical Engineering and Bioengineering
Characterization and Evaluation of Materials
Control
Coupling
Criteria
Dynamical Systems
Elastic properties
Engineering
Finite element method
Geometry
ISO standards
Lasers
Mathematical analysis
Nonlinearity
Optical Devices
Optics
Photonics
Plane stress
Plastic deformation
Plastic properties
Simulation
Slits
Solid Mechanics
Strain gauges
Stress concentration
Stress distribution
Vibration
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Summary:The stress and strain relationship in the gauge region of six cruciform geometries is studied: the ISO standard geometry with slits in arms, two geometries with thinned gauge areas, two geometries with thinned gauge areas and slits in arms, and one modified ISO standard geometry with slits in arms and a thinned gauge area. For all the geometries, finite element simulations are performed under uniaxial loading to compare the plastic strain, the von Mises stress distribution and the in-plane stress evolution. Results show that less plastic strain can be achieved in the gauge of the two ISO standard geometries. For the remaining cruciform geometries, a strong non-linear coupling between applied forces in arms and gauge stresses is generated. The evolution of this non-linear coupling depends on the geometry type, applied biaxial load ratio and the elastic-plastic properties of the material. Geometry selection criteria are proposed to reduce this non-linear coupling.
ISSN:0014-4851
1741-2765
DOI:10.1007/s11340-017-0270-6